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Timed track formats
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.
Kate
Binary format with text components, making it hard to hand-edit. The text components seem pretty verbose.
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.
Ogg Writ
Binary format, nigh on impossible to hand-edit.
Phoenix Subtitle (.pjs)
- No spec or demo file found
Uses frames for timings according to wikipedia.
PowerDivX (.psb)
Other formats
CMML and SMIL are not listed above since they don't appear to be subtitle formats so much as timed media mixing formats.