Refactored “type” to “frame_type” in append_concat_filter().

Found some more incorrect timedelta initialisations.

Added initial tests for FFmpegConcatCommand (ref #31).

Ensured that frame type is ignored in append_concat_filter().

Fixed incorrect default initialisation of punch in/out value.

Cleaned up test documentation (ref #31).

Added subtests to make failures clearer (ref #31).

Added expected filter options to shared tests (ref #31).

Refactored shared testing code into a TestCase superclass (ref #31).

Renamed test case classes (ref #31).

Removed inadvertent maxDiff setting (ref #31).

Added tests for FFmpegCommand class (ref #31).

Updated test options to something more meaningful (ref #31).

Added tests for FFprobeCommand (ref #31).

Removed unnecessary explicit attribute declarations (ref #31).

Fixed code type (ref #31).

Added unit tests for ConvertCommand class (ref #31).

Added test of quoted command string (ref #31).

Switched to assertTrue/False (ref #31).

Added remaining tests for ShellCommand class (ref #31).

Fixed wonky test initialisation (ref #31).

Added some initial unit tests for the ShellCommand class (ref #31).

Fixed bug in output from parser test.

Added a development virtualenv and documented requirements.

Replaced import * with explicit name imports.

Fixed logging of SegmentError (renamed to follow conventions) — ref #32.

Fixed use of itertools.count() to generate segment numbers (ref #32).

Changed distutils.spawn.fine_executable() to shutil.which() (ref #32).

Converted os.path to pathlib and all #! lines to python3 (ref #32).

Converted all print statements to functions for Python 3 (ref #32).