Ffsubsync Versions Save

This release includes miscellaneous sync improvements, compatibility fixes, and other bugfixes. It also includes functionality for using a new algorithm, called "golden section search", for inferring the framerate ratio between the reference and input subtitles. To use, pass the --gss flag -- it may help in some cases where subtitles are still out of sync, if the issue is that the scaling is different from the predefined ratios ffsubsync tries.

• Misc sync improvements:
  • Have webrtcvad use '0' as the non speech label instead of 0.5;
  • Allow the vad non speech label to be specified via the --non-speech-label command line parameter;
  • Don't try to infer framerate ratio based on length between first and last speech frames for non-subtitle speech detection;

• Lots of improvements from PRs submitted by @alucryd (big thanks!):
  • Retain ASS styles;
  • Support syncing several subs against the same ref via --overwrite-input flag;
  • Add --apply-offset-seconds postprocess option to shift alignment by prespecified amount;
• Filter out metadata in subtitles when extracting speech;
• Add experimental --golden-section-search over framerate ratio (off by default);
• Try to improve sync by inferring framerate ratio based on relative duration of synced vs unsynced;

• Make default offset seconds 60 and enforce during alignment as opposed to throwing away alignments with > max_offset_seconds;
• Add experimental section for using golden section search to find framerate ratio;
• Restore ability to read stdin and write stdout after buggy permissions check;
• Exceptions that occur during syncing were mistakenly suppressed; this is now fixed;

• Allow MicroDVD input format;
• Use output extension to determine output format;
• Bugfix for writing subs to stdout;
• Misc bugfixes and stability improvements;
• Use webrtcvad-wheels on Windows to eliminate dependency on compiler (i.e., better Windows support);

Better Windows support, additional options for consuming tools, rich text console logging.

• Attempt speech extraction from subtitle tracks embedded in video first before using VAD;

• Add ability to merge synced and reference subs into bilingual subs when reference is srt;

• Fix bug when handling ass/ssa input, this format should work now;

• Better detection of text file encodings;
• ASS / SSA functionality (but currently untested);
• Allow serialize speech with --serialize-speech flag;
• Convenient --make-test-case flag to create test cases when filing sync-related bugs;
• Use utf-8 as default output encoding (instead of using same encoding as input);
• More robust test framework (integration tests!);