youtube-ass

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Code to download and convert Youtube XML annotations to ASS format http://en.wikipedia.org/wiki/SubStation_Alpha#Advanced_SubStation_Alpha

Details about the ASS file format can be found at:

• http://www.matroska.org/technical/specs/subtitles/ssa.html
• http://moodub.free.fr/video/ass-specs.doc

This conversion script tries to maintain:

• Correct timing and text
• Font colour and background colour (can be improved)
• Positioning and width of subtitle text around the video

Positioning is hard to translated into ASS format because it uses Margins instead of x/y and there's very little control over vertical spacing.

TODO:

• Support languages other than English
• Try to use ASS Picture Event lines to create transparent text boxes
• Use ffmpeg to mux the audio/video/subtitle streams into mkv
• What about automatic captions?
• More that I'm forgetting.

Released under the CC-0 License

No code references were used while writing this parser, hence it's free of derivative licensing problems.

Created for use by youtube-dl:

• https://github.com/rg3/youtube-dl/issues/90