Merge branch 'master' of https://github.com/Otago-InfoSci-Database/Tools

• Added progress bars for all long-running operations (closes #18). ...

• Added new ProgressBar class.
• Switched from subprocess to pexpect for running shell commands.
• Added general shell quoting for debugging output of commands.
• Rewrote the way command strings and argument lists are generated.
• Removed “-loglevel error” from ffmpeg commands to enable capturing progress information (pexpect doesn’t echo the output anyway).

• Updated print_progress(): ...

– Added optional width argument.
    – Moved newline character to the start of the line rather than the end to stop the cursor overprinting the start of the progress bar.

• Removed [] indicating optional components, as the input specification syntax uses them as delimiters.

• Updated to reflect more flexible time specifications added in 9fd933f.

• Fixed parsing bug that produced incorrectly structured timestamp lists when using a duration file (introduced by restructuring of grammar).

• Added config5.txt to test files. ...

• Initial work on improving error reporting (catching parser exceptions).
• Some refactoring and rationalisation of the grammar.

• Reconfigured grammar to handle missing components in timestamps (closes #16). ...

• Refactored defaults setting so that it can be easily generalised to new cases.

• Changed “segment specification” to “time specification”, and “stream specification” to “segment specification”. This makes more sense, and is consistent with the configuration parser.

• Removed unused literals hyphen and comment_char.

• Added print_progress() function and implemented progress bar for frame processing (partial progress—hah!—towards #18).

• Ensured that audio/video output options and filters are only included when there actually is an audio/video stream (closes #19). ...

• Rearranged exception handling on main() so that a KeyboardInterrupt is caught no matter where you are in the process.

• Removed some leftovers from the deleted --config-help option.

• Removed the --config-help option as there appears to be no easy way to create additional standalone help-style options with argparse (it complains that there aren’t enough arguments because the positional argument is missing). The help text has been put into a separate Markdown file instead. (closes #12)

• Moved frame segment post-processing into a function. ...

• Ensured warnings about unequal stream durations are only output if there is both an audio and a video stream (closes #20).
• Fixed obsolete leftover occurrence of “options” in VideoSegment.get_last_frame_number().

• Normalised terminology around “streams” (closes #21).

• Shifted -truecolor setting from the outer image sequence into the parenthesised image sequence, to fix weird coloured box that were appearing on certain pages.

• Refactored input/output options variables and methods from FFmpegCommand into ShellCommand, so that all subclasses can use them. ...

• Enhanced ConvertCommand to do more intelligent processing of PDF frames of varying sizes and aspect ratios.

Merge branch 'master' of https://github.com/Otago-InfoSci-Database/Tools

• When appending a concat filter, check that the segments list actually contains something.

• Only print warning about differing audio and video durations when there’s actually some audio (may need further work?).

• Added white background and removed transparency for PDF to PNG image conversions.

• Ensured that audio_stream_number and video_stream_number always default to None.

• Default all missing fields to None instead of 0 or "" so we can check whether there actually is a value assigned if necessary.

• Finished support for generating frames directly from PDF slides (closes #8). ...

• Specified defaults for audio and video stream numbers.
• Fixed some typos on comments and debug output.
• Added "/" as a valid filename character for config files.
• Added some comments explaining the more obscure class variables in the Segment class.
• Generalised Segment.generate_last_frame() into generate_frame().
• Ensured that generate_temp_file() returns the generated filename.

• Enabled --config-help option (no content yet).

• Updated help messages for --audio and --video to reflect ability to specify default stream number.

• Added support for default stream numbers on the command line (in the form filename:0). Includes a custom argparse action handler to split the stream number from the filename. NOTE: not fully tested! (closes #11)

• Updated name of program.

• Removed --frame option (closes #10).