Fixed logging of SegmentError (renamed to follow conventions)

nigel.stanger / process_podcast

Browse code Fixed logging of SegmentError (renamed to follow conventions) — ref #32. master
1 parent 01eb528 commit 3943c13aa8bac854812ed726225c7ed46523fe89 Nigel Stanger authored on 28 Aug 2018

Patch

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#!/usr/bin/env python3 import argparse import datetime import logging from pathlib import Path, PurePath import sys from pyparsing import ParseResults import globals from config_parser import ( parse_configuration_file, parse_configuration_string) from progress_bar import (ProgressBar) from segment import (Segment, AudioSegment, VideoSegment, FrameSegment, SegmentError) from shell_command import (FFprobeCommand, FFmpegConcatCommand) class InputStreamAction(argparse.Action): def __call__(self, parser, namespace, values, option_string=None): input = values.split(":") file = input[0] stream = None if (len(input) == 1) else input[1] setattr(namespace, self.dest, file) if (option_string in ["--audio", "-a"]): setattr(namespace, 'audio_stream_number', stream) elif (option_string in ["--video", "-v"]): setattr(namespace, 'video_stream_number', stream) def parse_command_line(): """Parse command line arguments.""" parser = argparse.ArgumentParser( usage="%(prog)s [options] <output>", description="where: <output> is the name of the output file " "(note: .mov seems generally best)", epilog="Default input files can be specified using either of " "--audio or --video. If neither of these are specified, " "then you must supply a configuration file using --config. " "(Of course, you can always supply a configuration file " "regardless.)\n\n" "Input streams can be taken from the same input file.\n\n" "If no segments are specified, the entire input stream is " "processed as one segment. The number and duration of segments " "can differ, but the total duration across all input streams " "should ideally be the same.") parser.set_defaults(audio_stream_number=None, video_stream_number=None) parser.add_argument( "output", help="name of the output file (note: .mov is best)") parser.add_argument( "--audio", "-a", metavar="FILE[:STREAM]", action=InputStreamAction, help="File name for the default audio input stream (can be the " "same as for other input streams). You can optionally specify " "the default audio stream number to use if the file contains " "more than one (this can be overidden in a configuration " "file). If you don't specify a stream number, it defaults " "to 0 (i.e., the first audio stream in the file).") parser.add_argument( "--video", "-v", metavar="FILE[:STREAM]", action=InputStreamAction, help="File name for the default video input stream (can be the " "same as for other input streams). You can optionally specify " "the default video stream number to use if the file contains " "more than one (this can be overidden in a configuration " "file). If you don't specify a stream number, it defaults " "to 0 (i.e., the first video stream in the file).") parser.add_argument( "--configuration", "--config", "-c", dest="config", metavar="FILE", help="File name for the podcast segment configuration (plain text). " "See config_help.md details on the file " "format.".format(p=globals.PROGRAM)) parser.add_argument( "--copy-audio", dest="process_audio", action="store_false", default=True, help="Disable additional processing of the source audio. The audio " "will still be re-encoded using the specified audio codec " "because the concatenation filter requires it, but extra " "processing such as reduction of channels or normalisation " "will not be carried out. (Implies --no-normalise.)") parser.add_argument( "--copy-video", dest="process_video", action="store_false", default=True, help="Disable additional processing of the source video. The video " "will still be re-encoded using the specified video codec " "because the concatenation filter requires it, but extra " "processing such as remapping of colours will not be " "carried out.") parser.add_argument( "--no-normalise", dest="normalise", action="store_false", default=True, help="Disable normalisation of the source audio level (implied by " "--copy-audio).") parser.add_argument( "--audio-codec", dest="audio_codec", metavar="CODEC", default="pcm_s16le", help="Specify ffmpeg audio codec for output (default pcm_s16le). " "See the output of ffmpeg -codecs for possible codecs.") parser.add_argument( "--video-codec", dest="video_codec", metavar="CODEC", default="h264", help="Specify ffmpeg video codec for output (default h264). " "See the output of ffmpeg -codecs for possible codecs.") parser.add_argument( "--input-prefix", "-i", dest="prefix", metavar="PATH", default=".", help="Path to be prefixed to all INPUT files. This includes the " "configuration file, if applicable, and any files specified " "within the configuration file. Input files that already " "include the input prefix will not have it added again.") parser.add_argument( "--preview", "-p", metavar="RATE", nargs="?", const="1", help="Generate a preview of the podcast by only rendering a " "subset of the video frames. RATE is the number of frames " "per second to render (default 1 fps). You can specify " "fractions (e.g., 1/10 for one frame every 10 seconds). " 'NOTE: if you get a "too few arguments" error when using ' "this option, you've probably not provided an fps value and " "placed the option just before the output filename. " "Either move --preview earlier in the option list, add " 'a "--" between it and the output filename, or provide a ' "fps value.") parser.add_argument( "--debug", "-d", action="store_true", help="Print debugging output (overrides --quiet).") parser.add_argument( "--keep", "-k", action="store_true", help="Don't delete any generated temporary files.") parser.add_argument( "--quiet", "-q", action="store_true", help="Mute all console output (overridden by --debug).") args = parser.parse_args() return args def prefix_path(prefix, path): """Prepend prefix to path, unless path already starts with prefix""" assert(prefix is not None) if not path: return None elif path == "." or path.startswith(prefix): return path else: return Path(prefix, path) def check_arguments(args): """Sanity check the command line arguments.""" fn = "check_arguments" # Prepend input files with --input-prefix where applicable. args.audio, args.video, args.config = map( prefix_path, [args.prefix] * 3, [args.audio, args.video, args.config]) if args.quiet: globals.log.setLevel(logging.WARNING) # --copy-audio implies --no-normalise. if not args.process_audio: args.normalise = False # --debug overrides --quiet. if args.debug: globals.log.setLevel(logging.DEBUG) globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args)) # Must specify at least one of --audio, --video, --config. if not any([args.audio, args.video, args.config]): globals.log.error("must specify at least one of --audio, --video, " "or --config") sys.exit(1) if not Path(args.prefix).exists(): globals.log.error('input prefix "{p}" does not ' "exist".format(p=args.prefix)) sys.exit(1) def get_configuration(args): """Load podcast configuration.""" # Fill in missing file names for default input streams. fn = "get_configuration" # These types can have default input files and streams. type_mapping = { "audio": {"file": args.audio, "stream": args.audio_stream_number}, "video": {"file": args.video, "stream": args.video_stream_number}} globals.log.info("Processing configuration...") if (args.config): config = parse_configuration_file(args.config) # Check that applicable default input streams have been specified. for i, c in enumerate(config): type = c["type"] # Add prefix to filename, if applicable. if c["filename"] and (c["filename"] != "^"): config[i]["filename"] = prefix_path(args.prefix, config[i]["filename"]) if (type in type_mapping): default_file = type_mapping[type]["file"] default_stream = type_mapping[type]["stream"] error_string = ("attempting to use default {s} input file, " "but --{s} hasn't been specified".format(s=type)) else: default_file = None default_stream = 0 error_string = ("attempting to use a default input file, " "but the {s} type doesn't support this".format(s=type)) # No filename in configuration. if (not c["filename"]): if (default_file): config[i]["filename"] = default_file # No filename on command line either. else: globals.log.error(error_string) sys.exit(1) # No stream number in configuration. Note: 0 is a valid # stream number, so explicitly check for None. if (c["num"] is None): # Assume 0 if no stream on command line either. if (default_stream is None): config[i]["num"] = 0 else: config[i]["num"] = default_stream # No configuration file. else: conf_list = [] for m in type_mapping: default_file = type_mapping[m]["file"] default_stream = type_mapping[m]["stream"] if (default_file and default_stream is not None): conf_list += ["[{type}:{file}:{stream}]".format( type=m, file=default_file, stream=default_stream)] globals.log.debug("{fn}(): default config = " "{c}".format(fn=fn, c=conf_list)) config = parse_configuration_string("\n".join(conf_list)) return config def get_file_duration(file): """Calculate the duration a media file as a timedelta object.""" fn = "get_file_duration" command = FFprobeCommand([file]) globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command)) # Only consider the first stream. If it's the only stream in the # file, great; otherwise it seems reasonable to assume that all # streams in the same file will have the same duration. ss, ms = command.get_entries( section="format", find_list=["duration"])[0].split(".") ms = ms[:3].ljust(3, "0") globals.log.debug("{fn}(): ss = {ss}, ms = {ms}".format(fn=fn, ss=ss, ms=ms)) return datetime.timedelta(seconds=int(ss), milliseconds=int(ms)) def make_new_segment(type, filename, punch_in, punch_out, num): """Make a new segment instance of the correct class.""" fn = "make_new_segment" globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type)) globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename)) globals.log.debug("{fn}(): punch in = {i}".format(fn=fn, i=punch_in)) globals.log.debug("{fn}(): punch out = {o}".format(fn=fn, o=punch_out)) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num)) if (type == "audio"): return AudioSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "video"): return VideoSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "frame"): return FrameSegment(file=filename, punch_in=punch_in, punch_out=punch_out, frame_number=num) else: return None def process_timestamp_pair(args, times): """Constructs timedelta instances from a pair of config timestamps.""" fn = "process_timestamp_pair" globals.log.debug("{fn}(): times[0] = {t}".format(fn=fn, t=times[0])) globals.log.debug("{fn}(): times[1] = {t}".format(fn=fn, t=times[1])) # If the first item in the timestamp list in the configuration file # is a filename, the parser inserts a zero timestamp before it. We # can therefore guarantee that the first item of the pair will # always be a timestamp. t0 = datetime.timedelta( hours=times[0]["hh"], minutes=times[0]["mm"], seconds=times[0]["ss"], milliseconds=times[0]["ms"]) if (times[1]): if (len(times[1]) == 1): # filename t1 = t0 + get_file_duration( prefix_path(args.prefix, times[1]["filename"])) elif (len(times[1]) == 4): # normal timestamp t1 = datetime.timedelta( hours=times[1]["hh"], minutes=times[1]["mm"], seconds=times[1]["ss"], milliseconds=times[1]["ms"]) else: globals.log.error("{fn}():unreadable timestamp {t}".format( fn=fn, t=times[1])) t1 = None else: t1 = None globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=t0)) globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=t1)) return t0, t1 def process_time_list(args, type, filename, num, time_list): """Process an audio or video stream and build a list of segments.""" fn = "process_time_list" if (Path(filename).exists() and type in ["audio", "video"]): stream_duration = get_file_duration(filename) else: stream_duration = 0 segments = [] globals.log.debug("{fn}(): stream duration = {d}".format( fn=fn, d=stream_duration)) # No timestamps: punch in at 0, out at stream duration. if (len(time_list) == 0): punch_in = datetime.timedelta() punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) else: # Process each pair of timestamps as punch in, out. If there's # an odd number of items, the last one is processed separately. for t in zip(time_list[::2], time_list[1::2]): punch_in, punch_out = process_timestamp_pair(args, t) if (punch_in == punch_out): globals.log.warning( "punch in ({i}s) and punch out ({o}s) times are " "equal; no segment will be " "generated".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) continue elif (punch_out < punch_in): globals.log.error( "punch out time ({i}s) falls before punch in time " "({o}s); can't generate a valid " "segment".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) sys.exit(1) segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) # Odd number of timestamps: punch in at last timestamp, # out at stream duration. if (len(time_list) % 2 != 0): globals.log.debug("{fn}(): odd number of timestamps".format(fn=fn)) punch_in, _ = process_timestamp_pair(args, [time_list[-1], None]) punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) return segments def process_input_streams(args, config): """Process a list of stream specifications and build a list of segments.""" fn = "process_input_streams" globals.log.info("Processing input streams...") segments = [] for cnf in config: globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"])) globals.log.debug( "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"])) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"])) globals.log.debug("{fn}(): times = {t}".format(fn=fn, t=cnf["times"])) segments += process_time_list(args, cnf["type"], cnf["filename"], cnf["num"], cnf["times"]) return segments def smallest_video_dimensions(args, segments): """Compute the smallest frame dimensions across all video inputs.""" fn = "smallest_video_dimensions" width = 2048 height = 1536 for s in segments: if isinstance(s, FrameSegment): continue command = FFprobeCommand([s.input_file]) globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command)) w, h = command.get_entries(find_list=["width", "height"]) if (w * h) < (width * height): width, height = w, h return width, height def process_frame_segments(args, segments, width, height): """Post-process frame segments to set frame images, etc.""" fn = "process_frame_segments" globals.log.info("Processing frames...") frame_segments = [s for s in segments if isinstance(s, FrameSegment)] n = len(frame_segments) globals.log.debug("{fn}(): num frames = {n}".format(fn=fn, n=n)) progress = ProgressBar(max_value=n, quiet=args.quiet or args.debug or n == 0) progress.update(0) for i, f in enumerate(frame_segments): try: globals.log.debug( "{fn}(): frame (before) = {b}".format(fn=fn, b=f)) # Frame segments that use a frame from the previous segment. if (f.input_file == "^"): if (f.segment_number > 0): prev = segments[f.segment_number - 1] globals.log.debug( "{fn}(): prev = {p}".format(fn=fn, p=prev)) prev.generate_temp_file(args.output, width=width, height=height) f.use_frame( prev.generate_frame(f.frame_number, args.output, width=width, height=height)) else: globals.log.error( "frame segment {s} is attempting to use the last " "frame of a non-existent previous " "segment".format(s=f.segment_number)) sys.exit(1) # Frame segments whose frame comes from a PDF file. else: suffix = PurePath(f.input_file).suffix if (suffix.lower() == ".pdf"): f.use_frame(f.generate_temp_file(args.output, width=width, height=height)) else: globals.log.error( 'unexpected input file type "{s}" for frame segment ' "{f}".format(s=suffix, f=f.segment_number)) sys.exit(1) progress.update(i) globals.log.debug("{fn}(): frame (after) = ""{a}".format(fn=fn, a=f)) except SegmentError as e: progress.finish() globals.log.exception(e) sys.exit(1) else: progress.finish() def render_podcast(args, audio_segments, video_segments, output, duration): """Stitch together the various input components into the final podcast.""" fn = "render_podcast" globals.log.info("Rendering final podcast...") command = FFmpegConcatCommand(has_audio=len(audio_segments) > 0, has_video=len(video_segments) > 0, max_progress=duration, quiet=args.quiet and not args.debug, process_audio=args.process_audio, process_video=args.process_video, audio_codec=args.audio_codec, video_codec=args.video_codec) input_files = Segment.input_files() for f in input_files: if (input_files[f]): command.append_input_options(input_files[f]) command.append_input_options(["-i", f]) for s in (audio_segments + video_segments): command.append_filter(s.trim_filter()) command.append_concat_filter("a", [s for s in audio_segments]) if (args.normalise): command.append_normalisation_filter() command.append_concat_filter("v", [s for s in video_segments]) if args.preview: globals.log.info("PREVIEW MODE: {fps} fps".format(fps=args.preview)) command.append_output_options(["-r", args.preview]) command.append_output_options([output]) globals.log.debug("{fn}(): {c}".format(fn=fn, c=command)) if (command.run() != 0): globals.log.error("Failed to render final podcast") def cleanup(segments): """Clean up generated temporary files.""" globals.log.info("Cleaning up...") for s in segments: s.delete_temp_files() def main(): fn = "main" logging.basicConfig( level=logging.INFO, format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM)) segments = None try: args = parse_command_line() check_arguments(args) config = get_configuration(args) segments = process_input_streams(args, config) globals.log.debug("{fn}(): audio segments = {a}".format( fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)])) globals.log.debug("{fn}(): video segments = {v}".format( fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)])) audio_segments = [s for s in segments if isinstance(s, AudioSegment)] video_segments = [s for s in segments if isinstance(s, VideoSegment)] audio_duration = sum([s.get_duration() for s in audio_segments]) video_duration = sum([s.get_duration() for s in video_segments]) globals.log.debug("{fn}(): audio duration = " "{a}".format(fn=fn, a=audio_duration)) globals.log.debug("{fn}(): video duration = " "{v}".format(fn=fn, v=video_duration)) if (len(audio_segments) and len(video_segments)): if (audio_duration != video_duration): globals.log.warning("total video duration ({v}s) doesn't match " "total audio duration " "({a}s)".format(v=video_duration, a=audio_duration)) width, height = smallest_video_dimensions(args, video_segments) globals.log.debug("{fn}(): width = {w}, height = " "{h}".format(fn=fn, w=width, h=height)) process_frame_segments(args, segments, width, height) globals.log.debug("{fn}(): input files = " "{i}".format(fn=fn, i=Segment.input_files())) render_podcast(args, audio_segments, video_segments, args.output, max(audio_duration, video_duration)) except (KeyboardInterrupt): pass finally: if segments and not args.keep: cleanup(segments) if (__name__ == "__main__"): main() #!/usr/bin/env python3 import argparse import datetime import logging from pathlib import Path, PurePath import sys from pyparsing import ParseResults import globals from config_parser import ( parse_configuration_file, parse_configuration_string) from progress_bar import (ProgressBar) from segment import (Segment, AudioSegment, VideoSegment, FrameSegment, SegmentException) from shell_command import (FFprobeCommand, FFmpegConcatCommand) class InputStreamAction(argparse.Action): def __call__(self, parser, namespace, values, option_string=None): input = values.split(":") file = input[0] stream = None if (len(input) == 1) else input[1] setattr(namespace, self.dest, file) if (option_string in ["--audio", "-a"]): setattr(namespace, 'audio_stream_number', stream) elif (option_string in ["--video", "-v"]): setattr(namespace, 'video_stream_number', stream) def parse_command_line(): """Parse command line arguments.""" parser = argparse.ArgumentParser( usage="%(prog)s [options] <output>", description="where: <output> is the name of the output file " "(note: .mov seems generally best)", epilog="Default input files can be specified using either of " "--audio or --video. If neither of these are specified, " "then you must supply a configuration file using --config. " "(Of course, you can always supply a configuration file " "regardless.)\n\n" "Input streams can be taken from the same input file.\n\n" "If no segments are specified, the entire input stream is " "processed as one segment. The number and duration of segments " "can differ, but the total duration across all input streams " "should ideally be the same.") parser.set_defaults(audio_stream_number=None, video_stream_number=None) parser.add_argument( "output", help="name of the output file (note: .mov is best)") parser.add_argument( "--audio", "-a", metavar="FILE[:STREAM]", action=InputStreamAction, help="File name for the default audio input stream (can be the " "same as for other input streams). You can optionally specify " "the default audio stream number to use if the file contains " "more than one (this can be overidden in a configuration " "file). If you don't specify a stream number, it defaults " "to 0 (i.e., the first audio stream in the file).") parser.add_argument( "--video", "-v", metavar="FILE[:STREAM]", action=InputStreamAction, help="File name for the default video input stream (can be the " "same as for other input streams). You can optionally specify " "the default video stream number to use if the file contains " "more than one (this can be overidden in a configuration " "file). If you don't specify a stream number, it defaults " "to 0 (i.e., the first video stream in the file).") parser.add_argument( "--configuration", "--config", "-c", dest="config", metavar="FILE", help="File name for the podcast segment configuration (plain text). " "See config_help.md details on the file " "format.".format(p=globals.PROGRAM)) parser.add_argument( "--copy-audio", dest="process_audio", action="store_false", default=True, help="Disable additional processing of the source audio. The audio " "will still be re-encoded using the specified audio codec " "because the concatenation filter requires it, but extra " "processing such as reduction of channels or normalisation " "will not be carried out. (Implies --no-normalise.)") parser.add_argument( "--copy-video", dest="process_video", action="store_false", default=True, help="Disable additional processing of the source video. The video " "will still be re-encoded using the specified video codec " "because the concatenation filter requires it, but extra " "processing such as remapping of colours will not be " "carried out.") parser.add_argument( "--no-normalise", dest="normalise", action="store_false", default=True, help="Disable normalisation of the source audio level (implied by " "--copy-audio).") parser.add_argument( "--audio-codec", dest="audio_codec", metavar="CODEC", default="pcm_s16le", help="Specify ffmpeg audio codec for output (default pcm_s16le). " "See the output of ffmpeg -codecs for possible codecs.") parser.add_argument( "--video-codec", dest="video_codec", metavar="CODEC", default="h264", help="Specify ffmpeg video codec for output (default h264). " "See the output of ffmpeg -codecs for possible codecs.") parser.add_argument( "--input-prefix", "-i", dest="prefix", metavar="PATH", default=".", help="Path to be prefixed to all INPUT files. This includes the " "configuration file, if applicable, and any files specified " "within the configuration file. Input files that already " "include the input prefix will not have it added again.") parser.add_argument( "--preview", "-p", metavar="RATE", nargs="?", const="1", help="Generate a preview of the podcast by only rendering a " "subset of the video frames. RATE is the number of frames " "per second to render (default 1 fps). You can specify " "fractions (e.g., 1/10 for one frame every 10 seconds). " 'NOTE: if you get a "too few arguments" error when using ' "this option, you've probably not provided an fps value and " "placed the option just before the output filename. " "Either move --preview earlier in the option list, add " 'a "--" between it and the output filename, or provide a ' "fps value.") parser.add_argument( "--debug", "-d", action="store_true", help="Print debugging output (overrides --quiet).") parser.add_argument( "--keep", "-k", action="store_true", help="Don't delete any generated temporary files.") parser.add_argument( "--quiet", "-q", action="store_true", help="Mute all console output (overridden by --debug).") args = parser.parse_args() return args def prefix_path(prefix, path): """Prepend prefix to path, unless path already starts with prefix""" assert(prefix is not None) if not path: return None elif path == "." or path.startswith(prefix): return path else: return Path(prefix, path) def check_arguments(args): """Sanity check the command line arguments.""" fn = "check_arguments" # Prepend input files with --input-prefix where applicable. args.audio, args.video, args.config = map( prefix_path, [args.prefix] * 3, [args.audio, args.video, args.config]) if args.quiet: globals.log.setLevel(logging.WARNING) # --copy-audio implies --no-normalise. if not args.process_audio: args.normalise = False # --debug overrides --quiet. if args.debug: globals.log.setLevel(logging.DEBUG) globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args)) # Must specify at least one of --audio, --video, --config. if not any([args.audio, args.video, args.config]): globals.log.error("must specify at least one of --audio, --video, " "or --config") sys.exit(1) if not Path(args.prefix).exists(): globals.log.error('input prefix "{p}" does not ' "exist".format(p=args.prefix)) sys.exit(1) def get_configuration(args): """Load podcast configuration.""" # Fill in missing file names for default input streams. fn = "get_configuration" # These types can have default input files and streams. type_mapping = { "audio": {"file": args.audio, "stream": args.audio_stream_number}, "video": {"file": args.video, "stream": args.video_stream_number}} globals.log.info("Processing configuration...") if (args.config): config = parse_configuration_file(args.config) # Check that applicable default input streams have been specified. for i, c in enumerate(config): type = c["type"] # Add prefix to filename, if applicable. if c["filename"] and (c["filename"] != "^"): config[i]["filename"] = prefix_path(args.prefix, config[i]["filename"]) if (type in type_mapping): default_file = type_mapping[type]["file"] default_stream = type_mapping[type]["stream"] error_string = ("attempting to use default {s} input file, " "but --{s} hasn't been specified".format(s=type)) else: default_file = None default_stream = 0 error_string = ("attempting to use a default input file, " "but the {s} type doesn't support this".format(s=type)) # No filename in configuration. if (not c["filename"]): if (default_file): config[i]["filename"] = default_file # No filename on command line either. else: globals.log.error(error_string) sys.exit(1) # No stream number in configuration. Note: 0 is a valid # stream number, so explicitly check for None. if (c["num"] is None): # Assume 0 if no stream on command line either. if (default_stream is None): config[i]["num"] = 0 else: config[i]["num"] = default_stream # No configuration file. else: conf_list = [] for m in type_mapping: default_file = type_mapping[m]["file"] default_stream = type_mapping[m]["stream"] if (default_file and default_stream is not None): conf_list += ["[{type}:{file}:{stream}]".format( type=m, file=default_file, stream=default_stream)] globals.log.debug("{fn}(): default config = " "{c}".format(fn=fn, c=conf_list)) config = parse_configuration_string("\n".join(conf_list)) return config def get_file_duration(file): """Calculate the duration a media file as a timedelta object.""" fn = "get_file_duration" command = FFprobeCommand([file]) globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command)) # Only consider the first stream. If it's the only stream in the # file, great; otherwise it seems reasonable to assume that all # streams in the same file will have the same duration. ss, ms = command.get_entries( section="format", find_list=["duration"])[0].split(".") ms = ms[:3].ljust(3, "0") globals.log.debug("{fn}(): ss = {ss}, ms = {ms}".format(fn=fn, ss=ss, ms=ms)) return datetime.timedelta(seconds=int(ss), milliseconds=int(ms)) def make_new_segment(type, filename, punch_in, punch_out, num): """Make a new segment instance of the correct class.""" fn = "make_new_segment" globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type)) globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename)) globals.log.debug("{fn}(): punch in = {i}".format(fn=fn, i=punch_in)) globals.log.debug("{fn}(): punch out = {o}".format(fn=fn, o=punch_out)) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num)) if (type == "audio"): return AudioSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "video"): return VideoSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "frame"): return FrameSegment(file=filename, punch_in=punch_in, punch_out=punch_out, frame_number=num) else: return None def process_timestamp_pair(args, times): """Constructs timedelta instances from a pair of config timestamps.""" fn = "process_timestamp_pair" globals.log.debug("{fn}(): times[0] = {t}".format(fn=fn, t=times[0])) globals.log.debug("{fn}(): times[1] = {t}".format(fn=fn, t=times[1])) # If the first item in the timestamp list in the configuration file # is a filename, the parser inserts a zero timestamp before it. We # can therefore guarantee that the first item of the pair will # always be a timestamp. t0 = datetime.timedelta( hours=times[0]["hh"], minutes=times[0]["mm"], seconds=times[0]["ss"], milliseconds=times[0]["ms"]) if (times[1]): if (len(times[1]) == 1): # filename t1 = t0 + get_file_duration( prefix_path(args.prefix, times[1]["filename"])) elif (len(times[1]) == 4): # normal timestamp t1 = datetime.timedelta( hours=times[1]["hh"], minutes=times[1]["mm"], seconds=times[1]["ss"], milliseconds=times[1]["ms"]) else: globals.log.error("{fn}():unreadable timestamp {t}".format( fn=fn, t=times[1])) t1 = None else: t1 = None globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=t0)) globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=t1)) return t0, t1 def process_time_list(args, type, filename, num, time_list): """Process an audio or video stream and build a list of segments.""" fn = "process_time_list" if (Path(filename).exists() and type in ["audio", "video"]): stream_duration = get_file_duration(filename) else: stream_duration = 0 segments = [] globals.log.debug("{fn}(): stream duration = {d}".format( fn=fn, d=stream_duration)) # No timestamps: punch in at 0, out at stream duration. if (len(time_list) == 0): punch_in = datetime.timedelta() punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) else: # Process each pair of timestamps as punch in, out. If there's # an odd number of items, the last one is processed separately. for t in zip(time_list[::2], time_list[1::2]): punch_in, punch_out = process_timestamp_pair(args, t) if (punch_in == punch_out): globals.log.warning( "punch in ({i}s) and punch out ({o}s) times are " "equal; no segment will be " "generated".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) continue elif (punch_out < punch_in): globals.log.error( "punch out time ({i}s) falls before punch in time " "({o}s); can't generate a valid " "segment".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) sys.exit(1) segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) # Odd number of timestamps: punch in at last timestamp, # out at stream duration. if (len(time_list) % 2 != 0): globals.log.debug("{fn}(): odd number of timestamps".format(fn=fn)) punch_in, _ = process_timestamp_pair(args, [time_list[-1], None]) punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) return segments def process_input_streams(args, config): """Process a list of stream specifications and build a list of segments.""" fn = "process_input_streams" globals.log.info("Processing input streams...") segments = [] for cnf in config: globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"])) globals.log.debug( "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"])) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"])) globals.log.debug("{fn}(): times = {t}".format(fn=fn, t=cnf["times"])) segments += process_time_list(args, cnf["type"], cnf["filename"], cnf["num"], cnf["times"]) return segments def smallest_video_dimensions(args, segments): """Compute the smallest frame dimensions across all video inputs.""" fn = "smallest_video_dimensions" width = 2048 height = 1536 for s in segments: if isinstance(s, FrameSegment): continue command = FFprobeCommand([s.input_file]) globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command)) w, h = command.get_entries(find_list=["width", "height"]) if (w * h) < (width * height): width, height = w, h return width, height def process_frame_segments(args, segments, width, height): """Post-process frame segments to set frame images, etc.""" fn = "process_frame_segments" globals.log.info("Processing frames...") frame_segments = [s for s in segments if isinstance(s, FrameSegment)] n = len(frame_segments) globals.log.debug("{fn}(): num frames = {n}".format(fn=fn, n=n)) progress = ProgressBar(max_value=n, quiet=args.quiet or args.debug or n == 0) progress.update(0) for i, f in enumerate(frame_segments): try: globals.log.debug( "{fn}(): frame (before) = {b}".format(fn=fn, b=f)) # Frame segments that use a frame from the previous segment. if (f.input_file == "^"): if (f.segment_number > 0): prev = segments[f.segment_number - 1] globals.log.debug( "{fn}(): prev = {p}".format(fn=fn, p=prev)) prev.generate_temp_file(args.output, width=width, height=height) f.use_frame( prev.generate_frame(f.frame_number, args.output, width=width, height=height)) else: globals.log.error( "frame segment {s} is attempting to use the last " "frame of a non-existent previous " "segment".format(s=f.segment_number)) sys.exit(1) # Frame segments whose frame comes from a PDF file. else: suffix = PurePath(f.input_file).suffix if (suffix.lower() == ".pdf"): f.use_frame(f.generate_temp_file(args.output, width=width, height=height)) else: globals.log.error( 'unexpected input file type "{s}" for frame segment ' "{f}".format(s=suffix, f=f.segment_number)) sys.exit(1) progress.update(i) globals.log.debug("{fn}(): frame (after) = ""{a}".format(fn=fn, a=f)) except SegmentException as e: progress.finish() globals.log.error(e.message) sys.exit(1) else: progress.finish() def render_podcast(args, audio_segments, video_segments, output, duration): """Stitch together the various input components into the final podcast.""" fn = "render_podcast" globals.log.info("Rendering final podcast...") command = FFmpegConcatCommand(has_audio=len(audio_segments) > 0, has_video=len(video_segments) > 0, max_progress=duration, quiet=args.quiet and not args.debug, process_audio=args.process_audio, process_video=args.process_video, audio_codec=args.audio_codec, video_codec=args.video_codec) input_files = Segment.input_files() for f in input_files: if (input_files[f]): command.append_input_options(input_files[f]) command.append_input_options(["-i", f]) for s in (audio_segments + video_segments): command.append_filter(s.trim_filter()) command.append_concat_filter("a", [s for s in audio_segments]) if (args.normalise): command.append_normalisation_filter() command.append_concat_filter("v", [s for s in video_segments]) if args.preview: globals.log.info("PREVIEW MODE: {fps} fps".format(fps=args.preview)) command.append_output_options(["-r", args.preview]) command.append_output_options([output]) globals.log.debug("{fn}(): {c}".format(fn=fn, c=command)) if (command.run() != 0): globals.log.error("Failed to render final podcast") def cleanup(segments): """Clean up generated temporary files.""" globals.log.info("Cleaning up...") for s in segments: s.delete_temp_files() def main(): fn = "main" logging.basicConfig( level=logging.INFO, format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM)) segments = None try: args = parse_command_line() check_arguments(args) config = get_configuration(args) segments = process_input_streams(args, config) globals.log.debug("{fn}(): audio segments = {a}".format( fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)])) globals.log.debug("{fn}(): video segments = {v}".format( fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)])) audio_segments = [s for s in segments if isinstance(s, AudioSegment)] video_segments = [s for s in segments if isinstance(s, VideoSegment)] audio_duration = sum([s.get_duration() for s in audio_segments]) video_duration = sum([s.get_duration() for s in video_segments]) globals.log.debug("{fn}(): audio duration = " "{a}".format(fn=fn, a=audio_duration)) globals.log.debug("{fn}(): video duration = " "{v}".format(fn=fn, v=video_duration)) if (len(audio_segments) and len(video_segments)): if (audio_duration != video_duration): globals.log.warning("total video duration ({v}s) doesn't match " "total audio duration " "({a}s)".format(v=video_duration, a=audio_duration)) width, height = smallest_video_dimensions(args, video_segments) globals.log.debug("{fn}(): width = {w}, height = " "{h}".format(fn=fn, w=width, h=height)) process_frame_segments(args, segments, width, height) globals.log.debug("{fn}(): input files = " "{i}".format(fn=fn, i=Segment.input_files())) render_podcast(args, audio_segments, video_segments, args.output, max(audio_duration, video_duration)) except (KeyboardInterrupt): pass finally: if segments and not args.keep: cleanup(segments) if (__name__ == "__main__"): main()

Ignore Space Show notes View

process_podcast.py

#!/usr/bin/env python3

import argparse
import datetime
import logging
from pathlib import Path, PurePath
import sys

from pyparsing import ParseResults

import globals
from config_parser import (
    parse_configuration_file, parse_configuration_string)
from progress_bar import (ProgressBar)
from segment import (Segment, AudioSegment, VideoSegment,
                     FrameSegment, SegmentError)
from shell_command import (FFprobeCommand, FFmpegConcatCommand)

class InputStreamAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        input = values.split(":")
        file = input[0]
        stream = None if (len(input) == 1) else input[1]
        setattr(namespace, self.dest, file)
        if (option_string in ["--audio", "-a"]):
            setattr(namespace, 'audio_stream_number', stream)
        elif (option_string in ["--video", "-v"]):
            setattr(namespace, 'video_stream_number', stream)

def parse_command_line():
    """Parse command line arguments."""
    parser = argparse.ArgumentParser(
        usage="%(prog)s [options] <output>",
        description="where: <output> is the name of the output file "
            "(note: .mov seems generally best)",
        epilog="Default input files can be specified using either of "
            "--audio or --video. If neither of these are specified, "
            "then you must supply a configuration file using --config. "
            "(Of course, you can always supply a configuration file "
            "regardless.)\n\n"
            "Input streams can be taken from the same input file.\n\n"
            "If no segments are specified, the entire input stream is "
            "processed as one segment. The number and duration of segments "
            "can differ, but the total duration across all input streams "
            "should ideally be the same.")
    
    parser.set_defaults(audio_stream_number=None, video_stream_number=None)

parser.add_argument(
        "output",
        help="name of the output file (note: .mov is best)")
    
    parser.add_argument(
        "--audio", "-a", metavar="FILE[:STREAM]", action=InputStreamAction,
        help="File name for the default audio input stream (can be the "
            "same as for other input streams). You can optionally specify "
            "the default audio stream number to use if the file contains "
            "more than one (this can be overidden in a configuration "
            "file). If you don't specify a stream number, it defaults "
            "to 0 (i.e., the first audio stream in the file).")
    
    parser.add_argument(
        "--video", "-v", metavar="FILE[:STREAM]", action=InputStreamAction,
        help="File name for the default video input stream (can be the "
            "same as for other input streams). You can optionally specify "
            "the default video stream number to use if the file contains "
            "more than one (this can be overidden in a configuration "
            "file). If you don't specify a stream number, it defaults "
            "to 0 (i.e., the first video stream in the file).")
    
    parser.add_argument(
        "--configuration", "--config", "-c", dest="config", metavar="FILE",
        help="File name for the podcast segment configuration (plain text). "
            "See config_help.md details on the file "
            "format.".format(p=globals.PROGRAM))
    
    parser.add_argument(
        "--copy-audio", dest="process_audio", action="store_false",
        default=True,
        help="Disable additional processing of the source audio. The audio "
            "will still be re-encoded using the specified audio codec "
            "because the concatenation filter requires it, but extra "
            "processing such as reduction of channels or normalisation "
            "will not be carried out. (Implies --no-normalise.)")
    
    parser.add_argument(
        "--copy-video", dest="process_video", action="store_false",
        default=True,
        help="Disable additional processing of the source video. The video "
            "will still be re-encoded using the specified video codec "
            "because the concatenation filter requires it, but extra "
            "processing such as remapping of colours will not be "
            "carried out.")
    
    parser.add_argument(
        "--no-normalise", dest="normalise", action="store_false",
        default=True,
        help="Disable normalisation of the source audio level (implied by "
            "--copy-audio).")
    
    parser.add_argument(
        "--audio-codec", dest="audio_codec", metavar="CODEC",
        default="pcm_s16le",
        help="Specify ffmpeg audio codec for output (default pcm_s16le). "
            "See the output of ffmpeg -codecs for possible codecs.")
    
    parser.add_argument(
        "--video-codec", dest="video_codec", metavar="CODEC", default="h264",
        help="Specify ffmpeg video codec for output (default h264). "
            "See the output of ffmpeg -codecs for possible codecs.")
    
    parser.add_argument(
        "--input-prefix", "-i", dest="prefix", metavar="PATH", default=".",
        help="Path to be prefixed to all INPUT files. This includes the "
            "configuration file, if applicable, and any files specified "
            "within the configuration file. Input files that already "
            "include the input prefix will not have it added again.")
    
    parser.add_argument(
        "--preview", "-p", metavar="RATE", nargs="?", const="1",
        help="Generate a preview of the podcast by only rendering a "
            "subset of the video frames. RATE is the number of frames "
            "per second to render (default 1 fps). You can specify "
            "fractions (e.g., 1/10 for one frame every 10 seconds). "
            'NOTE: if you get a "too few arguments" error when using '
            "this option, you've probably not provided an fps value and "
            "placed the option just before the output filename. "
            "Either move --preview earlier in the option list, add "
            'a "--" between it and the output filename, or provide a '
            "fps value.")
    
    parser.add_argument(
        "--debug", "-d", action="store_true",
        help="Print debugging output (overrides --quiet).")
    
    parser.add_argument(
        "--keep", "-k", action="store_true",
        help="Don't delete any generated temporary files.")
    
    parser.add_argument(
        "--quiet", "-q", action="store_true",
        help="Mute all console output (overridden by --debug).")

args = parser.parse_args()
    
    return args

def prefix_path(prefix, path):
    """Prepend prefix to path, unless path already starts with prefix"""
    assert(prefix is not None)
    if not path:
        return None
    elif path == "." or path.startswith(prefix):
        return path
    else:
        return Path(prefix, path)

def check_arguments(args):
    """Sanity check the command line arguments."""
    fn = "check_arguments"
    # Prepend input files with --input-prefix where applicable.
    args.audio, args.video, args.config = map(
        prefix_path, [args.prefix] * 3, [args.audio, args.video, args.config])

if args.quiet:
        globals.log.setLevel(logging.WARNING)
    
    # --copy-audio implies --no-normalise.
    if not args.process_audio:
        args.normalise = False
        
    # --debug overrides --quiet.
    if args.debug:
        globals.log.setLevel(logging.DEBUG)
        globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args))
    
    # Must specify at least one of --audio, --video, --config.
    if not any([args.audio, args.video, args.config]):
        globals.log.error("must specify at least one of --audio, --video, "
                          "or --config")
        sys.exit(1)
    
    if not Path(args.prefix).exists():
        globals.log.error('input prefix "{p}" does not '
                          "exist".format(p=args.prefix))
        sys.exit(1)

def get_configuration(args):
    """Load podcast configuration."""
    # Fill in missing file names for default input streams.
    fn = "get_configuration"
    # These types can have default input files and streams.
    type_mapping = {
        "audio": {"file": args.audio, "stream": args.audio_stream_number},
        "video": {"file": args.video, "stream": args.video_stream_number}}
    globals.log.info("Processing configuration...")
    if (args.config):
        config = parse_configuration_file(args.config)
        
        # Check that applicable default input streams have been specified.
        for i, c in enumerate(config):
            type = c["type"]
            
            # Add prefix to filename, if applicable.
            if c["filename"] and (c["filename"] != "^"):
                config[i]["filename"] = prefix_path(args.prefix,
                                                    config[i]["filename"])
            
            if (type in type_mapping):
                default_file = type_mapping[type]["file"]
                default_stream = type_mapping[type]["stream"]
                error_string = ("attempting to use default {s} input file, "
                    "but --{s} hasn't been specified".format(s=type))
            else:
                default_file = None
                default_stream = 0
                error_string = ("attempting to use a default input file, "
                    "but the {s} type doesn't support this".format(s=type))

# No filename in configuration.
            if (not c["filename"]):
                if (default_file):
                    config[i]["filename"] = default_file
                # No filename on command line either.
                else:
                    globals.log.error(error_string)
                    sys.exit(1)
            
            # No stream number in configuration. Note: 0 is a valid
            # stream number, so explicitly check for None.
            if (c["num"] is None):
                # Assume 0 if no stream on command line either.
                if (default_stream is None):
                    config[i]["num"] = 0
                else:
                    config[i]["num"] = default_stream
    
    # No configuration file.
    else:
        conf_list = []
        for m in type_mapping:
            default_file = type_mapping[m]["file"]
            default_stream = type_mapping[m]["stream"]
            if (default_file and default_stream is not None):
                conf_list += ["[{type}:{file}:{stream}]".format(
                    type=m, file=default_file, stream=default_stream)]
        globals.log.debug("{fn}(): default config = "
                          "{c}".format(fn=fn, c=conf_list))
        config = parse_configuration_string("\n".join(conf_list))
    
    return config

def get_file_duration(file):
    """Calculate the duration a media file as a timedelta object."""
    fn = "get_file_duration"
    command = FFprobeCommand([file])
    globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command))
    # Only consider the first stream. If it's the only stream in the
    # file, great; otherwise it seems reasonable to assume that all
    # streams in the same file will have the same duration.
    ss, ms = command.get_entries(
        section="format", find_list=["duration"])[0].split(".")
    ms = ms[:3].ljust(3, "0")
    globals.log.debug("{fn}(): ss = {ss}, ms = {ms}".format(fn=fn, ss=ss,
                                                            ms=ms))
    return datetime.timedelta(seconds=int(ss), milliseconds=int(ms))

def make_new_segment(type, filename, punch_in, punch_out, num):
    """Make a new segment instance of the correct class."""
    fn = "make_new_segment"
    globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type))
    globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename))
    globals.log.debug("{fn}(): punch in = {i}".format(fn=fn, i=punch_in))
    globals.log.debug("{fn}(): punch out = {o}".format(fn=fn, o=punch_out))
    globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num))
    
    if (type == "audio"):
        return AudioSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, input_stream=num)
    elif (type == "video"):
        return VideoSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, input_stream=num)
    elif (type == "frame"):
        return FrameSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, frame_number=num)
    else:
        return None

def process_timestamp_pair(args, times):
    """Constructs timedelta instances from a pair of config timestamps."""
    fn = "process_timestamp_pair"
    globals.log.debug("{fn}(): times[0] = {t}".format(fn=fn, t=times[0]))
    globals.log.debug("{fn}(): times[1] = {t}".format(fn=fn, t=times[1]))
    
    # If the first item in the timestamp list in the configuration file
    # is a filename, the parser inserts a zero timestamp before it. We
    # can therefore guarantee that the first item of the pair will
    # always be a timestamp.
    t0 = datetime.timedelta(
        hours=times[0]["hh"], minutes=times[0]["mm"],
        seconds=times[0]["ss"], milliseconds=times[0]["ms"])
    if (times[1]):
        if (len(times[1]) == 1): # filename
            t1 = t0 + get_file_duration(
                prefix_path(args.prefix, times[1]["filename"]))
        elif (len(times[1]) == 4): # normal timestamp
            t1 = datetime.timedelta(
                hours=times[1]["hh"], minutes=times[1]["mm"],
                seconds=times[1]["ss"], milliseconds=times[1]["ms"])
        else:
            globals.log.error("{fn}():unreadable timestamp {t}".format(
                fn=fn, t=times[1]))
            t1 = None
    else:
        t1 = None
    
    globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=t0))
    globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=t1))
    return t0, t1

def process_time_list(args, type, filename, num, time_list):
    """Process an audio or video stream and build a list of segments."""
    fn = "process_time_list"
    if (Path(filename).exists() and type in ["audio", "video"]):
        stream_duration = get_file_duration(filename)
    else:
        stream_duration = 0
    segments = []
    globals.log.debug("{fn}(): stream duration = {d}".format(
        fn=fn, d=stream_duration))
    
    # No timestamps: punch in at 0, out at stream duration.
    if (len(time_list) == 0):
        punch_in = datetime.timedelta()
        punch_out = stream_duration
        segments.append(make_new_segment(type, filename, punch_in,
                                         punch_out, num))
    else:
        # Process each pair of timestamps as punch in, out. If there's
        # an odd number of items, the last one is processed separately.
        for t in zip(time_list[::2], time_list[1::2]):
            punch_in, punch_out = process_timestamp_pair(args, t)
            if (punch_in == punch_out):
                globals.log.warning(
                    "punch in ({i}s) and punch out ({o}s) times are "
                    "equal; no segment will be "
                    "generated".format(i=punch_in.total_seconds(),
                                       o=punch_out.total_seconds()))
                continue
            elif (punch_out < punch_in):
                globals.log.error(
                    "punch out time ({i}s) falls before punch in time "
                    "({o}s); can't generate a valid "
                    "segment".format(i=punch_in.total_seconds(),
                                     o=punch_out.total_seconds()))
                sys.exit(1)
            segments.append(make_new_segment(type, filename, punch_in,
                                             punch_out, num))
    
    # Odd number of timestamps: punch in at last timestamp,
    # out at stream duration.
    if (len(time_list) % 2 != 0):
        globals.log.debug("{fn}(): odd number of timestamps".format(fn=fn))
        punch_in, _ = process_timestamp_pair(args, [time_list[-1], None])
        punch_out = stream_duration
        segments.append(make_new_segment(type, filename, punch_in,
                                         punch_out, num))
    return segments

def process_input_streams(args, config):
    """Process a list of stream specifications and build a list of segments."""
    fn = "process_input_streams"
    globals.log.info("Processing input streams...")
    segments = []
    for cnf in config:
        globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"]))
        globals.log.debug(
            "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"]))
        globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"]))
        globals.log.debug("{fn}(): times = {t}".format(fn=fn, t=cnf["times"]))
    
        segments += process_time_list(args, cnf["type"], cnf["filename"],
                                      cnf["num"], cnf["times"])  
    return segments

def smallest_video_dimensions(args, segments):
    """Compute the smallest frame dimensions across all video inputs."""
    fn = "smallest_video_dimensions"
    width = 2048
    height = 1536
    for s in segments:
        if isinstance(s, FrameSegment):
            continue
        command = FFprobeCommand([s.input_file])
        globals.log.debug("{fn}(): {cmd}".format(fn=fn, cmd=command))
        w, h = command.get_entries(find_list=["width", "height"])
        if (w * h) < (width * height):
            width, height = w, h
    return width, height

def process_frame_segments(args, segments, width, height):
    """Post-process frame segments to set frame images, etc."""
    fn = "process_frame_segments"
    globals.log.info("Processing frames...")
    frame_segments = [s for s in segments if isinstance(s, FrameSegment)]
    n = len(frame_segments)
    globals.log.debug("{fn}(): num frames = {n}".format(fn=fn, n=n))
    progress = ProgressBar(max_value=n,
                           quiet=args.quiet or args.debug or n == 0)
    progress.update(0)
    for i, f in enumerate(frame_segments):
        try:
            globals.log.debug(
                "{fn}(): frame (before) = {b}".format(fn=fn, b=f))
            # Frame segments that use a frame from the previous segment.
            if (f.input_file == "^"):
                if (f.segment_number > 0):
                    prev = segments[f.segment_number - 1]
                    globals.log.debug(
                        "{fn}(): prev = {p}".format(fn=fn, p=prev))
                    prev.generate_temp_file(args.output, width=width,
                                            height=height)
                    f.use_frame(
                        prev.generate_frame(f.frame_number, args.output,
                                            width=width, height=height))
                else:
                    globals.log.error(
                        "frame segment {s} is attempting to use the last "
                        "frame of a non-existent previous "
                        "segment".format(s=f.segment_number))
                    sys.exit(1)
            # Frame segments whose frame comes from a PDF file.
            else:
                suffix = PurePath(f.input_file).suffix
                if (suffix.lower() == ".pdf"):
                    f.use_frame(f.generate_temp_file(args.output, width=width,
                                            height=height))
                else:
                    globals.log.error(
                        'unexpected input file type "{s}" for frame segment '
                        "{f}".format(s=suffix, f=f.segment_number))
                    sys.exit(1)
            progress.update(i)
            globals.log.debug("{fn}(): frame (after) = ""{a}".format(fn=fn, a=f))
        except SegmentError as e:
            progress.finish()
            globals.log.exception(e)
            sys.exit(1)
    else:
        progress.finish()

def render_podcast(args, audio_segments, video_segments, output, duration):
    """Stitch together the various input components into the final podcast."""
    fn = "render_podcast"
    globals.log.info("Rendering final podcast...")
    command = FFmpegConcatCommand(has_audio=len(audio_segments) > 0,
                                  has_video=len(video_segments) > 0,
                                  max_progress=duration,
                                  quiet=args.quiet and not args.debug,
                                  process_audio=args.process_audio,
                                  process_video=args.process_video,
                                  audio_codec=args.audio_codec,
                                  video_codec=args.video_codec)
    input_files = Segment.input_files()
    for f in input_files:
        if (input_files[f]):
            command.append_input_options(input_files[f])
        command.append_input_options(["-i", f])
    for s in (audio_segments + video_segments):
        command.append_filter(s.trim_filter())
    command.append_concat_filter("a", [s for s in audio_segments])
    if (args.normalise):
        command.append_normalisation_filter()
    command.append_concat_filter("v", [s for s in video_segments])
    if args.preview:
        globals.log.info("PREVIEW MODE: {fps} fps".format(fps=args.preview))
        command.append_output_options(["-r", args.preview])
    command.append_output_options([output])
    globals.log.debug("{fn}(): {c}".format(fn=fn, c=command))
    if (command.run() != 0):
        globals.log.error("Failed to render final podcast")

def cleanup(segments):
    """Clean up generated temporary files."""
    globals.log.info("Cleaning up...")
    for s in segments:
        s.delete_temp_files()

def main():
    fn = "main"
    logging.basicConfig(
        level=logging.INFO,
        format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM))
    segments = None
    
    try:
        args = parse_command_line()
        check_arguments(args)
    
        config = get_configuration(args)
    
        segments = process_input_streams(args, config)
        globals.log.debug("{fn}(): audio segments = {a}".format(
            fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)]))
        globals.log.debug("{fn}(): video segments = {v}".format(
            fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)]))
    
        audio_segments = [s for s in segments if isinstance(s, AudioSegment)]
        video_segments = [s for s in segments if isinstance(s, VideoSegment)]
    
        audio_duration = sum([s.get_duration() for s in audio_segments])
        video_duration = sum([s.get_duration() for s in video_segments])
        globals.log.debug("{fn}(): audio duration = "
                          "{a}".format(fn=fn, a=audio_duration))
        globals.log.debug("{fn}(): video duration = "
                          "{v}".format(fn=fn, v=video_duration))
    
        if (len(audio_segments) and len(video_segments)):
            if (audio_duration != video_duration):
                globals.log.warning("total video duration ({v}s) doesn't match "
                            "total audio duration "
                            "({a}s)".format(v=video_duration, a=audio_duration))
        
        width, height = smallest_video_dimensions(args, video_segments)
        globals.log.debug("{fn}(): width = {w}, height = "
                          "{h}".format(fn=fn, w=width, h=height))
        
        process_frame_segments(args, segments, width, height)
    
        globals.log.debug("{fn}(): input files = "
                          "{i}".format(fn=fn, i=Segment.input_files()))
    
        render_podcast(args, audio_segments, video_segments, args.output,
                       max(audio_duration, video_duration))

except (KeyboardInterrupt):
        pass
    finally:
        if segments and not args.keep:
            cleanup(segments)

if (__name__ == "__main__"):
    main()

#!/usr/bin/env python3

import argparse
import datetime
import logging
from pathlib import Path, PurePath
import sys

from pyparsing import ParseResults

import globals
from config_parser import (
    parse_configuration_file, parse_configuration_string)
from progress_bar import (ProgressBar)
from segment import (Segment, AudioSegment, VideoSegment,
                     FrameSegment, SegmentException)
from shell_command import (FFprobeCommand, FFmpegConcatCommand)

args = parser.parse_args()
    
    return args

def process_frame_segments(args, segments, width, height):
    """Post-process frame segments to set frame images, etc."""
    fn = "process_frame_segments"
    globals.log.info("Processing frames...")
    frame_segments = [s for s in segments if isinstance(s, FrameSegment)]
    n = len(frame_segments)
    globals.log.debug("{fn}(): num frames = {n}".format(fn=fn, n=n))
    progress = ProgressBar(max_value=n,
                           quiet=args.quiet or args.debug or n == 0)
    progress.update(0)
    for i, f in enumerate(frame_segments):
        try:
            globals.log.debug(
                "{fn}(): frame (before) = {b}".format(fn=fn, b=f))
            # Frame segments that use a frame from the previous segment.
            if (f.input_file == "^"):
                if (f.segment_number > 0):
                    prev = segments[f.segment_number - 1]
                    globals.log.debug(
                        "{fn}(): prev = {p}".format(fn=fn, p=prev))
                    prev.generate_temp_file(args.output, width=width,
                                            height=height)
                    f.use_frame(
                        prev.generate_frame(f.frame_number, args.output,
                                            width=width, height=height))
                else:
                    globals.log.error(
                        "frame segment {s} is attempting to use the last "
                        "frame of a non-existent previous "
                        "segment".format(s=f.segment_number))
                    sys.exit(1)
            # Frame segments whose frame comes from a PDF file.
            else:
                suffix = PurePath(f.input_file).suffix
                if (suffix.lower() == ".pdf"):
                    f.use_frame(f.generate_temp_file(args.output, width=width,
                                            height=height))
                else:
                    globals.log.error(
                        'unexpected input file type "{s}" for frame segment '
                        "{f}".format(s=suffix, f=f.segment_number))
                    sys.exit(1)
            progress.update(i)
            globals.log.debug("{fn}(): frame (after) = ""{a}".format(fn=fn, a=f))
        except SegmentException as e:
            progress.finish()
            globals.log.error(e.message)
            sys.exit(1)
    else:
        progress.finish()

def cleanup(segments):
    """Clean up generated temporary files."""
    globals.log.info("Cleaning up...")
    for s in segments:
        s.delete_temp_files()

except (KeyboardInterrupt):
        pass
    finally:
        if segments and not args.keep:
            cleanup(segments)

if (__name__ == "__main__"):
    main()

Ignore Space Show notes View segment.py
#!/usr/bin/env python3 from collections import OrderedDict import errno import itertools import logging import os from pathlib import Path import globals from shell_command import (ConvertCommand, FFprobeCommand, FFmpegCommand) class SegmentError(Exception): pass class Segment(object): """A segment within the podcast. A segment has an input file, and a punch-in and punch-out point (both in seconds). """ # Automatic segment number generator. _new_segment_num = next(itertools.count()) # Keep track of input files in the order they're loaded, so that we # can easily reference them by index in the ffmpeg command (i.e., # first input file is, 0, etc.). _input_files = OrderedDict() # A string representing the type of the segment (e.g., "audio"). # This is handy for generating temporary files and means that we # can implement this as a single method in the root class. _TYPE = "" # Which trim and setpts filters to use in ffmpeg complex filters. # As above, this lets us implement a single method in the root class. _TRIM = "" _SETPTS = "" @staticmethod def input_files(): return Segment._input_files @staticmethod def _rename_input_file(old, new): tmp = OrderedDict() for f in Segment._input_files: if (f == old): tmp[new] = Segment._input_files[f] else: tmp[f] = Segment._input_files[f] Segment._input_files = tmp def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): self.segment_number = self.__class__._new_segment_num() self.input_file = file self.punch_in = punch_in self.punch_out = punch_out self.input_stream = input_stream self._temp_file = "" self._temp_suffix = "mov" # List of temporary files to delete when cleaning up. self._temp_files_list = [] if (file not in self.__class__._input_files): self.__class__._input_files[file] = None self._input_options = ["-ss", str(self.punch_in.total_seconds()), "-t", str(self.get_duration()), "-i", self.input_file] self._output_options = [] def __repr__(self): return('<{c} {n}: file "{f}", in {i}, out ' '{o}>'.format(c=self.__class__.__name__, n=self.segment_number, t=self._TYPE, f=self.input_file, i=self.punch_in, o=self.punch_out)) def get_duration(self): """Return the duration of the segment in seconds.""" return (self.punch_out - self.punch_in).total_seconds() def generate_temp_filename(self, output, suffix=None): """Generate a temporary filename for the segment.""" if not suffix: suffix = self._temp_suffix return Path("temp_{t}_{o}_{n:03d}".format( t=self._TYPE, o=Path(output).stem, n=self.segment_number)).with_suffix(suffix) def generate_temp_file(self, output, width=0, height=0): """Compile the segment from the original source file(s).""" # Note: width and height are currently ignored for segments # in general. This may (or may not) need to change if there # are multiple inputs of different dimensions. fn = "generate_temp_file" self._temp_file = self.generate_temp_filename(output) command = FFmpegCommand( input_options=self._input_options + ["-codec", "copy"], output_options=self._output_options + [self._temp_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_file) return self._temp_file else: raise SegmentError( "Failed to generate temporary file {f} for " "{s}".format(f=self._temp_file, s=self)) def temp_file(self): """Return the temporary file associated with the segment.""" return self._temp_file def delete_temp_files(self): """Delete the temporary file(s) associated with the segment.""" # Note: sometimes segments (especially frame segments) may # share the same temporary file. Just ignore the file not # found exception that occurs in these cases. for f in self._temp_files_list: try: os.remove(f) except OSError as e: if (e.errno != errno.ENOENT): raise e def input_stream_specifier(self): """Return the segment's ffmpeg stream input specifier.""" return "[{n}:{t}]".format( n=self.__class__._input_files.keys().index(self.input_file), t=self._TYPE[0] if self._TYPE else "") def output_stream_specifier(self): """Return the segment's ffmpeg audio stream output specifier.""" return "[{t}{n}]".format(t=self._TYPE[0] if self._TYPE else "", n=self.segment_number) def trim_filter(self): """Return an FFMPEG trim filter for this segment.""" return ("{inspec} " "{trim}=start={pi}:duration={po},{setpts}=PTS-STARTPTS " "{outspec}".format( inspec=self.input_stream_specifier(), trim=self._TRIM, setpts=self._SETPTS, pi=self.punch_in.total_seconds(), po=self.get_duration(), outspec=self.output_stream_specifier())) class AudioSegment(Segment): """A segment of an audio input stream.""" _TYPE = "audio" _TRIM = "atrim" _SETPTS = "asetpts" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): super(AudioSegment, self).__init__(file, punch_in, punch_out, input_stream) self._temp_suffix = "wav" self._output_options = ["-ac", "1", "-map", "{n}:a".format(n=self.input_stream)] class VideoSegment(Segment): """A segment of a video input stream.""" _TYPE = "video" _TRIM = "trim" _SETPTS = "setpts" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): super(VideoSegment, self).__init__(file, punch_in, punch_out, input_stream) self._output_options = ["-map", "{n}:v".format(n=self.input_stream)] self._temp_frame_file = "" def get_last_frame_number(self): """Calculate frame number of segment's last frame using ffprobe.""" fn = "get_last_frame_number" if (self._temp_file): self._temp_frame_file = "__{f}".format(f=self._temp_file) # To speed things up, grab up to the last 5 seconds of the # segment's temporary file, as we otherwise have to scan the # entire temporary file to find the last frame, which can # take a while. command = FFmpegCommand( input_options=["-ss", str(max(self.get_duration() - 5, 0)), "-i", self._temp_file], output_options=["-codec:v", "copy", "-map", "0:v", self._temp_frame_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_frame_file) command = FFprobeCommand([self._temp_frame_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) return int(command.get_entries( section="stream", find_list=["nb_frames"])[0]) - 1 else: raise SegmentError( "Failed to generate temporary file to get last frame " "number for {s}".format(s=self)) else: raise SegmentError( "Can't get last frame of {s} because it has no temporary " "file".format(s=self)) def generate_frame(self, frame_number, output, width=2048, height=1536): """Create a JPEG file from the specified frame of the segment.""" # Note: width and height are currently ignored for video # segments. This will need to change if there are multiple # video inputs of different dimensions. fn = "generate_frame" temp_frame = self.generate_temp_filename(output, suffix="jpg") if (frame_number == -1): frame_number = self.get_last_frame_number() command = FFmpegCommand( input_options=["-i", self._temp_frame_file], output_options=["-filter:v", "select='eq(n, {n})'".format(n=frame_number), "-frames:v", "1", "-f", "image2", "-map", "0:v", temp_frame]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(temp_frame) return temp_frame else: raise SegmentError( "Failed to create JPEG for frame {n} of " "{s}".format(n=frame_number, s=self)) class FrameSegment(VideoSegment): """A video segment derived from a single still frame.""" _TYPE = "frame" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0, frame_number=0): super(FrameSegment, self).__init__(file, punch_in, punch_out, input_stream) self.frame_number = frame_number self._input_options = ["-loop", "1", "-t", str(self.get_duration()), "-i", self.input_file] self.__class__._input_files[file] = self._input_options[:4] def __repr__(self): return('<{c} {n}: file "{f}", in {i}, out {o}, frame number ' '{fn}>'.format(c=self.__class__.__name__, n=self.segment_number, t=self._TYPE, f=self.input_file, i=self.punch_in, o=self.punch_out, fn=self.frame_number)) def generate_temp_file(self, output, width=2048, height=1536): """Compile the segment from the original source file(s).""" fn = "generate_temp_file" self._temp_file = self.generate_temp_filename(output, suffix="jpg") command = ConvertCommand( input_options=["{f}[{n}]".format( f=self.input_file, n=self.frame_number)], output_options=["{f}".format(f=self._temp_file)], width=width, height=height) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_file) return self._temp_file else: raise SegmentError( "Failed to generate temporary file {f} for " "{s}".format(f=self._temp_file, s=self)) def use_frame(self, frame): """Set the image to use for generating the frame video.""" self.__class__._rename_input_file(self.input_file, frame) self.input_file = frame self._input_options = ["-loop", "1", "-t", str(self.get_duration()), "-i", self.input_file] self.__class__._input_files[frame] = self._input_options[:4] def input_stream_specifier(self): """Return the segment's ffmpeg stream input specifier.""" return "[{n}:v]".format( n=self.__class__._input_files.keys().index(self.input_file)) def output_stream_specifier(self): """Return the segment's ffmpeg audio stream output specifier.""" return self.input_stream_specifier() def trim_filter(self): """Return an FFMPEG trim filter for this segment.""" return "" if (__name__ == "__main__"): pass #!/usr/bin/env python3 from collections import OrderedDict import errno import itertools import logging import os from pathlib import Path import globals from shell_command import (ConvertCommand, FFprobeCommand, FFmpegCommand) class SegmentException(Exception): pass class Segment(object): """A segment within the podcast. A segment has an input file, and a punch-in and punch-out point (both in seconds). """ # Automatic segment number generator. _new_segment_num = next(itertools.count()) # Keep track of input files in the order they're loaded, so that we # can easily reference them by index in the ffmpeg command (i.e., # first input file is, 0, etc.). _input_files = OrderedDict() # A string representing the type of the segment (e.g., "audio"). # This is handy for generating temporary files and means that we # can implement this as a single method in the root class. _TYPE = "" # Which trim and setpts filters to use in ffmpeg complex filters. # As above, this lets us implement a single method in the root class. _TRIM = "" _SETPTS = "" @staticmethod def input_files(): return Segment._input_files @staticmethod def _rename_input_file(old, new): tmp = OrderedDict() for f in Segment._input_files: if (f == old): tmp[new] = Segment._input_files[f] else: tmp[f] = Segment._input_files[f] Segment._input_files = tmp def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): self.segment_number = self.__class__._new_segment_num() self.input_file = file self.punch_in = punch_in self.punch_out = punch_out self.input_stream = input_stream self._temp_file = "" self._temp_suffix = "mov" # List of temporary files to delete when cleaning up. self._temp_files_list = [] if (file not in self.__class__._input_files): self.__class__._input_files[file] = None self._input_options = ["-ss", str(self.punch_in.total_seconds()), "-t", str(self.get_duration()), "-i", self.input_file] self._output_options = [] def __repr__(self): return('<{c} {n}: file "{f}", in {i}, out ' '{o}>'.format(c=self.__class__.__name__, n=self.segment_number, t=self._TYPE, f=self.input_file, i=self.punch_in, o=self.punch_out)) def get_duration(self): """Return the duration of the segment in seconds.""" return (self.punch_out - self.punch_in).total_seconds() def generate_temp_filename(self, output, suffix=None): """Generate a temporary filename for the segment.""" if not suffix: suffix = self._temp_suffix return Path("temp_{t}_{o}_{n:03d}".format( t=self._TYPE, o=Path(output).stem, n=self.segment_number)).with_suffix(suffix) def generate_temp_file(self, output, width=0, height=0): """Compile the segment from the original source file(s).""" # Note: width and height are currently ignored for segments # in general. This may (or may not) need to change if there # are multiple inputs of different dimensions. fn = "generate_temp_file" self._temp_file = self.generate_temp_filename(output) command = FFmpegCommand( input_options=self._input_options + ["-codec", "copy"], output_options=self._output_options + [self._temp_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_file) return self._temp_file else: raise SegmentException( "Failed to generate temporary file {f} for " "{s}".format(f=self._temp_file, s=self)) def temp_file(self): """Return the temporary file associated with the segment.""" return self._temp_file def delete_temp_files(self): """Delete the temporary file(s) associated with the segment.""" # Note: sometimes segments (especially frame segments) may # share the same temporary file. Just ignore the file not # found exception that occurs in these cases. for f in self._temp_files_list: try: os.remove(f) except OSError as e: if (e.errno != errno.ENOENT): raise e def input_stream_specifier(self): """Return the segment's ffmpeg stream input specifier.""" return "[{n}:{t}]".format( n=self.__class__._input_files.keys().index(self.input_file), t=self._TYPE[0] if self._TYPE else "") def output_stream_specifier(self): """Return the segment's ffmpeg audio stream output specifier.""" return "[{t}{n}]".format(t=self._TYPE[0] if self._TYPE else "", n=self.segment_number) def trim_filter(self): """Return an FFMPEG trim filter for this segment.""" return ("{inspec} " "{trim}=start={pi}:duration={po},{setpts}=PTS-STARTPTS " "{outspec}".format( inspec=self.input_stream_specifier(), trim=self._TRIM, setpts=self._SETPTS, pi=self.punch_in.total_seconds(), po=self.get_duration(), outspec=self.output_stream_specifier())) class AudioSegment(Segment): """A segment of an audio input stream.""" _TYPE = "audio" _TRIM = "atrim" _SETPTS = "asetpts" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): super(AudioSegment, self).__init__(file, punch_in, punch_out, input_stream) self._temp_suffix = "wav" self._output_options = ["-ac", "1", "-map", "{n}:a".format(n=self.input_stream)] class VideoSegment(Segment): """A segment of a video input stream.""" _TYPE = "video" _TRIM = "trim" _SETPTS = "setpts" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0): super(VideoSegment, self).__init__(file, punch_in, punch_out, input_stream) self._output_options = ["-map", "{n}:v".format(n=self.input_stream)] self._temp_frame_file = "" def get_last_frame_number(self): """Calculate frame number of segment's last frame using ffprobe.""" fn = "get_last_frame_number" if (self._temp_file): self._temp_frame_file = "__{f}".format(f=self._temp_file) # To speed things up, grab up to the last 5 seconds of the # segment's temporary file, as we otherwise have to scan the # entire temporary file to find the last frame, which can # take a while. command = FFmpegCommand( input_options=["-ss", str(max(self.get_duration() - 5, 0)), "-i", self._temp_file], output_options=["-codec:v", "copy", "-map", "0:v", self._temp_frame_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_frame_file) command = FFprobeCommand([self._temp_frame_file]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) return int(command.get_entries( section="stream", find_list=["nb_frames"])[0]) - 1 else: raise SegmentException( "Failed to generate temporary file to get last frame " "number for {s}".format(s=self)) else: raise SegmentException( "Can't get last frame of {s} because it has no temporary " "file".format(s=self)) def generate_frame(self, frame_number, output, width=2048, height=1536): """Create a JPEG file from the specified frame of the segment.""" # Note: width and height are currently ignored for video # segments. This will need to change if there are multiple # video inputs of different dimensions. fn = "generate_frame" temp_frame = self.generate_temp_filename(output, suffix="jpg") if (frame_number == -1): frame_number = self.get_last_frame_number() command = FFmpegCommand( input_options=["-i", self._temp_frame_file], output_options=["-filter:v", "select='eq(n, {n})'".format(n=frame_number), "-frames:v", "1", "-f", "image2", "-map", "0:v", temp_frame]) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(temp_frame) return temp_frame else: raise SegmentException( "Failed to create JPEG for frame {n} of " "{s}".format(n=frame_number, s=self)) class FrameSegment(VideoSegment): """A video segment derived from a single still frame.""" _TYPE = "frame" def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0, frame_number=0): super(FrameSegment, self).__init__(file, punch_in, punch_out, input_stream) self.frame_number = frame_number self._input_options = ["-loop", "1", "-t", str(self.get_duration()), "-i", self.input_file] self.__class__._input_files[file] = self._input_options[:4] def __repr__(self): return('<{c} {n}: file "{f}", in {i}, out {o}, frame number ' '{fn}>'.format(c=self.__class__.__name__, n=self.segment_number, t=self._TYPE, f=self.input_file, i=self.punch_in, o=self.punch_out, fn=self.frame_number)) def generate_temp_file(self, output, width=2048, height=1536): """Compile the segment from the original source file(s).""" fn = "generate_temp_file" self._temp_file = self.generate_temp_filename(output, suffix="jpg") command = ConvertCommand( input_options=["{f}[{n}]".format( f=self.input_file, n=self.frame_number)], output_options=["{f}".format(f=self._temp_file)], width=width, height=height) globals.log.debug("{cls}.{fn}(): {cmd}".format( cls=self.__class__.__name__, fn=fn, cmd=command)) if (command.run() == 0): self._temp_files_list.append(self._temp_file) return self._temp_file else: raise SegmentException( "Failed to generate temporary file {f} for " "{s}".format(f=self._temp_file, s=self)) def use_frame(self, frame): """Set the image to use for generating the frame video.""" self.__class__._rename_input_file(self.input_file, frame) self.input_file = frame self._input_options = ["-loop", "1", "-t", str(self.get_duration()), "-i", self.input_file] self.__class__._input_files[frame] = self._input_options[:4] def input_stream_specifier(self): """Return the segment's ffmpeg stream input specifier.""" return "[{n}:v]".format( n=self.__class__._input_files.keys().index(self.input_file)) def output_stream_specifier(self): """Return the segment's ffmpeg audio stream output specifier.""" return self.input_stream_specifier() def trim_filter(self): """Return an FFMPEG trim filter for this segment.""" return "" if (__name__ == "__main__"): pass

Ignore Space Show notes View

segment.py

#!/usr/bin/env python3

from collections import OrderedDict
import errno
import itertools
import logging
import os
from pathlib import Path

import globals
from shell_command import (ConvertCommand, FFprobeCommand, FFmpegCommand)

class SegmentError(Exception):
    pass

class Segment(object):
    """A segment within the podcast.
    
    A segment has an input file, and a punch-in and punch-out
    point (both in seconds).
    """
    # Automatic segment number generator.
    _new_segment_num = next(itertools.count())
    
    # Keep track of input files in the order they're loaded, so that we
    # can easily reference them by index in the ffmpeg command (i.e.,
    # first input file is, 0, etc.).
    _input_files = OrderedDict()
    
    # A string representing the type of the segment (e.g., "audio").
    # This is handy for generating temporary files and means that we
    # can implement this as a single method in the root class.
    _TYPE = ""
    
    # Which trim and setpts filters to use in ffmpeg complex filters.
    # As above, this lets us implement a single method in the root class.
    _TRIM = ""
    _SETPTS = ""
    
    @staticmethod
    def input_files():
        return Segment._input_files
    
    @staticmethod
    def _rename_input_file(old, new):
        tmp = OrderedDict()
        for f in Segment._input_files:
            if (f == old):
                tmp[new] = Segment._input_files[f]
            else:
                tmp[f] = Segment._input_files[f]
        Segment._input_files = tmp
    
    def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0):
        self.segment_number = self.__class__._new_segment_num()
        self.input_file = file
        self.punch_in = punch_in
        self.punch_out = punch_out
        self.input_stream = input_stream
        self._temp_file = ""
        self._temp_suffix = "mov"
        # List of temporary files to delete when cleaning up.
        self._temp_files_list = []
        
        if (file not in self.__class__._input_files):
            self.__class__._input_files[file] = None
        
        self._input_options = ["-ss", str(self.punch_in.total_seconds()),
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self._output_options = []
            
    def __repr__(self):
        return('<{c} {n}: file "{f}", in {i}, out '
               '{o}>'.format(c=self.__class__.__name__,
                             n=self.segment_number,
                             t=self._TYPE,
                             f=self.input_file,
                             i=self.punch_in,
                             o=self.punch_out))
    
    def get_duration(self):
        """Return the duration of the segment in seconds."""
        return (self.punch_out - self.punch_in).total_seconds()
    
    def generate_temp_filename(self, output, suffix=None):
        """Generate a temporary filename for the segment."""
        if not suffix:
            suffix = self._temp_suffix
        return Path("temp_{t}_{o}_{n:03d}".format(
            t=self._TYPE, o=Path(output).stem,
            n=self.segment_number)).with_suffix(suffix)
    
    def generate_temp_file(self, output, width=0, height=0):
        """Compile the segment from the original source file(s)."""
        # Note: width and height are currently ignored for segments
        # in general. This may (or may not) need to change if there
        # are multiple inputs of different dimensions.
        fn = "generate_temp_file"
        self._temp_file = self.generate_temp_filename(output)
        command = FFmpegCommand(
            input_options=self._input_options + ["-codec", "copy"],
            output_options=self._output_options + [self._temp_file])
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(self._temp_file)
            return self._temp_file
        else:
            raise SegmentError(
                "Failed to generate temporary file {f} for "
                "{s}".format(f=self._temp_file, s=self))
    
    def temp_file(self):
        """Return the temporary file associated with the segment."""
        return self._temp_file
    
    def delete_temp_files(self):
        """Delete the temporary file(s) associated with the segment."""
        # Note: sometimes segments (especially frame segments) may
        # share the same temporary file. Just ignore the file not
        # found exception that occurs in these cases.
        for f in self._temp_files_list:
            try:
                os.remove(f)
            except OSError as e:
                if (e.errno != errno.ENOENT):
                    raise e
    
    def input_stream_specifier(self):
        """Return the segment's ffmpeg stream input specifier."""
        return "[{n}:{t}]".format(
            n=self.__class__._input_files.keys().index(self.input_file),
            t=self._TYPE[0] if self._TYPE else "")
        
    def output_stream_specifier(self):
        """Return the segment's ffmpeg audio stream output specifier."""
        return "[{t}{n}]".format(t=self._TYPE[0] if self._TYPE else "",
                                 n=self.segment_number)
    
    def trim_filter(self):
        """Return an FFMPEG trim filter for this segment."""
        return ("{inspec} "
                "{trim}=start={pi}:duration={po},{setpts}=PTS-STARTPTS "
                "{outspec}".format(
                    inspec=self.input_stream_specifier(),
                    trim=self._TRIM, setpts=self._SETPTS,
                    pi=self.punch_in.total_seconds(),
                    po=self.get_duration(),
                    outspec=self.output_stream_specifier()))

class AudioSegment(Segment):
    """A segment of an audio input stream."""
    _TYPE = "audio"
    _TRIM = "atrim"
    _SETPTS = "asetpts"

def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0):
        super(AudioSegment, self).__init__(file, punch_in, punch_out,
                                           input_stream)
        self._temp_suffix = "wav"
        self._output_options = ["-ac", "1",
                                "-map", "{n}:a".format(n=self.input_stream)]

class VideoSegment(Segment):
    """A segment of a video input stream."""
    _TYPE = "video"
    _TRIM = "trim"
    _SETPTS = "setpts"

def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0):
        super(VideoSegment, self).__init__(file, punch_in, punch_out,
                                           input_stream)
        self._output_options = ["-map", "{n}:v".format(n=self.input_stream)]
        self._temp_frame_file = ""
    
    def get_last_frame_number(self):
        """Calculate frame number of segment's last frame using ffprobe."""
        fn = "get_last_frame_number"
        if (self._temp_file):
            self._temp_frame_file = "__{f}".format(f=self._temp_file)
        
            # To speed things up, grab up to the last 5 seconds of the
            # segment's temporary file, as we otherwise have to scan the
            # entire temporary file to find the last frame, which can
            # take a while.
            command = FFmpegCommand(
                input_options=["-ss", str(max(self.get_duration() - 5, 0)),
                               "-i", self._temp_file],
                output_options=["-codec:v", "copy",
                                "-map", "0:v",
                                self._temp_frame_file])
            globals.log.debug("{cls}.{fn}(): {cmd}".format(
                cls=self.__class__.__name__, fn=fn, cmd=command))
            if (command.run() == 0):
                self._temp_files_list.append(self._temp_frame_file)
                command = FFprobeCommand([self._temp_frame_file])
                globals.log.debug("{cls}.{fn}(): {cmd}".format(
                    cls=self.__class__.__name__, fn=fn, cmd=command))
                return int(command.get_entries(
                    section="stream", find_list=["nb_frames"])[0]) - 1
            else:
                raise SegmentError(
                    "Failed to generate temporary file to get last frame "
                    "number for {s}".format(s=self))
        else:
            raise SegmentError(
                "Can't get last frame of {s} because it has no temporary "
                "file".format(s=self))
    
    def generate_frame(self, frame_number, output, width=2048, height=1536):
        """Create a JPEG file from the specified frame of the segment."""
        # Note: width and height are currently ignored for video
        # segments. This will need to change if there are multiple
        # video inputs of different dimensions.
        fn = "generate_frame"
        temp_frame = self.generate_temp_filename(output, suffix="jpg")
        if (frame_number == -1):
            frame_number = self.get_last_frame_number()
        command = FFmpegCommand(
            input_options=["-i", self._temp_frame_file],
            output_options=["-filter:v",
                            "select='eq(n, {n})'".format(n=frame_number),
                            "-frames:v", "1",
                            "-f", "image2",
                            "-map", "0:v",
                            temp_frame])
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(temp_frame)
            return temp_frame
        else:
            raise SegmentError(
                "Failed to create JPEG for frame {n} of "
                "{s}".format(n=frame_number, s=self))

class FrameSegment(VideoSegment):
    """A video segment derived from a single still frame."""
    _TYPE = "frame"
    
    def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0,
                 frame_number=0):
        super(FrameSegment, self).__init__(file, punch_in, punch_out,
                                           input_stream)
        self.frame_number = frame_number
        self._input_options = ["-loop", "1",
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self.__class__._input_files[file] = self._input_options[:4]
    
    def __repr__(self):
        return('<{c} {n}: file "{f}", in {i}, out {o}, frame number '
               '{fn}>'.format(c=self.__class__.__name__,
                             n=self.segment_number,
                             t=self._TYPE,
                             f=self.input_file,
                             i=self.punch_in,
                             o=self.punch_out,
                             fn=self.frame_number))
    
    def generate_temp_file(self, output, width=2048, height=1536):
        """Compile the segment from the original source file(s)."""
        fn = "generate_temp_file"
        self._temp_file = self.generate_temp_filename(output, suffix="jpg")
        command = ConvertCommand(
            input_options=["{f}[{n}]".format(
                f=self.input_file, n=self.frame_number)],
            output_options=["{f}".format(f=self._temp_file)],
            width=width, height=height)
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(self._temp_file)
            return self._temp_file
        else:
            raise SegmentError(
                "Failed to generate temporary file {f} for "
                "{s}".format(f=self._temp_file, s=self))
    
    def use_frame(self, frame):
        """Set the image to use for generating the frame video."""
        self.__class__._rename_input_file(self.input_file, frame)
        self.input_file = frame
        self._input_options = ["-loop", "1",
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self.__class__._input_files[frame] = self._input_options[:4]
        
    def input_stream_specifier(self):
        """Return the segment's ffmpeg stream input specifier."""
        return "[{n}:v]".format(
            n=self.__class__._input_files.keys().index(self.input_file))
        
    def output_stream_specifier(self):
        """Return the segment's ffmpeg audio stream output specifier."""
        return self.input_stream_specifier()
    
    def trim_filter(self):
        """Return an FFMPEG trim filter for this segment."""
        return ""

if (__name__ == "__main__"):
    pass

#!/usr/bin/env python3

from collections import OrderedDict
import errno
import itertools
import logging
import os
from pathlib import Path

import globals
from shell_command import (ConvertCommand, FFprobeCommand, FFmpegCommand)

class SegmentException(Exception):
    pass

class Segment(object):
    """A segment within the podcast.
    
    A segment has an input file, and a punch-in and punch-out
    point (both in seconds).
    """
    # Automatic segment number generator.
    _new_segment_num = next(itertools.count())
    
    # Keep track of input files in the order they're loaded, so that we
    # can easily reference them by index in the ffmpeg command (i.e.,
    # first input file is, 0, etc.).
    _input_files = OrderedDict()
    
    # A string representing the type of the segment (e.g., "audio").
    # This is handy for generating temporary files and means that we
    # can implement this as a single method in the root class.
    _TYPE = ""
    
    # Which trim and setpts filters to use in ffmpeg complex filters.
    # As above, this lets us implement a single method in the root class.
    _TRIM = ""
    _SETPTS = ""
    
    @staticmethod
    def input_files():
        return Segment._input_files
    
    @staticmethod
    def _rename_input_file(old, new):
        tmp = OrderedDict()
        for f in Segment._input_files:
            if (f == old):
                tmp[new] = Segment._input_files[f]
            else:
                tmp[f] = Segment._input_files[f]
        Segment._input_files = tmp
    
    def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0):
        self.segment_number = self.__class__._new_segment_num()
        self.input_file = file
        self.punch_in = punch_in
        self.punch_out = punch_out
        self.input_stream = input_stream
        self._temp_file = ""
        self._temp_suffix = "mov"
        # List of temporary files to delete when cleaning up.
        self._temp_files_list = []
        
        if (file not in self.__class__._input_files):
            self.__class__._input_files[file] = None
        
        self._input_options = ["-ss", str(self.punch_in.total_seconds()),
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self._output_options = []
            
    def __repr__(self):
        return('<{c} {n}: file "{f}", in {i}, out '
               '{o}>'.format(c=self.__class__.__name__,
                             n=self.segment_number,
                             t=self._TYPE,
                             f=self.input_file,
                             i=self.punch_in,
                             o=self.punch_out))
    
    def get_duration(self):
        """Return the duration of the segment in seconds."""
        return (self.punch_out - self.punch_in).total_seconds()
    
    def generate_temp_filename(self, output, suffix=None):
        """Generate a temporary filename for the segment."""
        if not suffix:
            suffix = self._temp_suffix
        return Path("temp_{t}_{o}_{n:03d}".format(
            t=self._TYPE, o=Path(output).stem,
            n=self.segment_number)).with_suffix(suffix)
    
    def generate_temp_file(self, output, width=0, height=0):
        """Compile the segment from the original source file(s)."""
        # Note: width and height are currently ignored for segments
        # in general. This may (or may not) need to change if there
        # are multiple inputs of different dimensions.
        fn = "generate_temp_file"
        self._temp_file = self.generate_temp_filename(output)
        command = FFmpegCommand(
            input_options=self._input_options + ["-codec", "copy"],
            output_options=self._output_options + [self._temp_file])
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(self._temp_file)
            return self._temp_file
        else:
            raise SegmentException(
                "Failed to generate temporary file {f} for "
                "{s}".format(f=self._temp_file, s=self))
    
    def temp_file(self):
        """Return the temporary file associated with the segment."""
        return self._temp_file
    
    def delete_temp_files(self):
        """Delete the temporary file(s) associated with the segment."""
        # Note: sometimes segments (especially frame segments) may
        # share the same temporary file. Just ignore the file not
        # found exception that occurs in these cases.
        for f in self._temp_files_list:
            try:
                os.remove(f)
            except OSError as e:
                if (e.errno != errno.ENOENT):
                    raise e
    
    def input_stream_specifier(self):
        """Return the segment's ffmpeg stream input specifier."""
        return "[{n}:{t}]".format(
            n=self.__class__._input_files.keys().index(self.input_file),
            t=self._TYPE[0] if self._TYPE else "")
        
    def output_stream_specifier(self):
        """Return the segment's ffmpeg audio stream output specifier."""
        return "[{t}{n}]".format(t=self._TYPE[0] if self._TYPE else "",
                                 n=self.segment_number)
    
    def trim_filter(self):
        """Return an FFMPEG trim filter for this segment."""
        return ("{inspec} "
                "{trim}=start={pi}:duration={po},{setpts}=PTS-STARTPTS "
                "{outspec}".format(
                    inspec=self.input_stream_specifier(),
                    trim=self._TRIM, setpts=self._SETPTS,
                    pi=self.punch_in.total_seconds(),
                    po=self.get_duration(),
                    outspec=self.output_stream_specifier()))

class AudioSegment(Segment):
    """A segment of an audio input stream."""
    _TYPE = "audio"
    _TRIM = "atrim"
    _SETPTS = "asetpts"

class VideoSegment(Segment):
    """A segment of a video input stream."""
    _TYPE = "video"
    _TRIM = "trim"
    _SETPTS = "setpts"

def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0):
        super(VideoSegment, self).__init__(file, punch_in, punch_out,
                                           input_stream)
        self._output_options = ["-map", "{n}:v".format(n=self.input_stream)]
        self._temp_frame_file = ""
    
    def get_last_frame_number(self):
        """Calculate frame number of segment's last frame using ffprobe."""
        fn = "get_last_frame_number"
        if (self._temp_file):
            self._temp_frame_file = "__{f}".format(f=self._temp_file)
        
            # To speed things up, grab up to the last 5 seconds of the
            # segment's temporary file, as we otherwise have to scan the
            # entire temporary file to find the last frame, which can
            # take a while.
            command = FFmpegCommand(
                input_options=["-ss", str(max(self.get_duration() - 5, 0)),
                               "-i", self._temp_file],
                output_options=["-codec:v", "copy",
                                "-map", "0:v",
                                self._temp_frame_file])
            globals.log.debug("{cls}.{fn}(): {cmd}".format(
                cls=self.__class__.__name__, fn=fn, cmd=command))
            if (command.run() == 0):
                self._temp_files_list.append(self._temp_frame_file)
                command = FFprobeCommand([self._temp_frame_file])
                globals.log.debug("{cls}.{fn}(): {cmd}".format(
                    cls=self.__class__.__name__, fn=fn, cmd=command))
                return int(command.get_entries(
                    section="stream", find_list=["nb_frames"])[0]) - 1
            else:
                raise SegmentException(
                    "Failed to generate temporary file to get last frame "
                    "number for {s}".format(s=self))
        else:
            raise SegmentException(
                "Can't get last frame of {s} because it has no temporary "
                "file".format(s=self))
    
    def generate_frame(self, frame_number, output, width=2048, height=1536):
        """Create a JPEG file from the specified frame of the segment."""
        # Note: width and height are currently ignored for video
        # segments. This will need to change if there are multiple
        # video inputs of different dimensions.
        fn = "generate_frame"
        temp_frame = self.generate_temp_filename(output, suffix="jpg")
        if (frame_number == -1):
            frame_number = self.get_last_frame_number()
        command = FFmpegCommand(
            input_options=["-i", self._temp_frame_file],
            output_options=["-filter:v",
                            "select='eq(n, {n})'".format(n=frame_number),
                            "-frames:v", "1",
                            "-f", "image2",
                            "-map", "0:v",
                            temp_frame])
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(temp_frame)
            return temp_frame
        else:
            raise SegmentException(
                "Failed to create JPEG for frame {n} of "
                "{s}".format(n=frame_number, s=self))

class FrameSegment(VideoSegment):
    """A video segment derived from a single still frame."""
    _TYPE = "frame"
    
    def __init__(self, file="", punch_in=0, punch_out=0, input_stream=0,
                 frame_number=0):
        super(FrameSegment, self).__init__(file, punch_in, punch_out,
                                           input_stream)
        self.frame_number = frame_number
        self._input_options = ["-loop", "1",
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self.__class__._input_files[file] = self._input_options[:4]
    
    def __repr__(self):
        return('<{c} {n}: file "{f}", in {i}, out {o}, frame number '
               '{fn}>'.format(c=self.__class__.__name__,
                             n=self.segment_number,
                             t=self._TYPE,
                             f=self.input_file,
                             i=self.punch_in,
                             o=self.punch_out,
                             fn=self.frame_number))
    
    def generate_temp_file(self, output, width=2048, height=1536):
        """Compile the segment from the original source file(s)."""
        fn = "generate_temp_file"
        self._temp_file = self.generate_temp_filename(output, suffix="jpg")
        command = ConvertCommand(
            input_options=["{f}[{n}]".format(
                f=self.input_file, n=self.frame_number)],
            output_options=["{f}".format(f=self._temp_file)],
            width=width, height=height)
        globals.log.debug("{cls}.{fn}(): {cmd}".format(
            cls=self.__class__.__name__, fn=fn, cmd=command))
        if (command.run() == 0):
            self._temp_files_list.append(self._temp_file)
            return self._temp_file
        else:
            raise SegmentException(
                "Failed to generate temporary file {f} for "
                "{s}".format(f=self._temp_file, s=self))
    
    def use_frame(self, frame):
        """Set the image to use for generating the frame video."""
        self.__class__._rename_input_file(self.input_file, frame)
        self.input_file = frame
        self._input_options = ["-loop", "1",
                               "-t", str(self.get_duration()),
                               "-i", self.input_file]
        self.__class__._input_files[frame] = self._input_options[:4]
        
    def input_stream_specifier(self):
        """Return the segment's ffmpeg stream input specifier."""
        return "[{n}:v]".format(
            n=self.__class__._input_files.keys().index(self.input_file))
        
    def output_stream_specifier(self):
        """Return the segment's ffmpeg audio stream output specifier."""
        return self.input_stream_specifier()
    
    def trim_filter(self):
        """Return an FFMPEG trim filter for this segment."""
        return ""

if (__name__ == "__main__"):
    pass

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