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Timed track formats
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Lists of formats:
- http://wiki.videolan.org/Subtitles_codecs
- http://en.wikipedia.org/wiki/Subtitle_(captioning)#For_software_video_players
Requirements:
- We need to use time for timings, not frames, because the same file might apply to multiple versions of the same video, with different frame rates.
- For a similar reason, any positioning needs to be relative to the frame, not absolute (in pixels)
(Extensions marked * below are shared by multiple formats.)
AQTitle (.aqt)
Uses frames for timings.
JACOSub (.jss)
Pretty complicated.
MicroDVD (.sub*)
Uses frames for timings.
MPEG-4 Timed Text (.ttxt)
Pretty complicated. Seems to be formatting-centric. Has some pixel-based positioning. Difficult to hand-edit.
MPSub (.sub*)
Relative timings, which can be hard to hand-edit correctly. Could be extended usefully.