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Timed track formats

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Revision as of 00:30, 27 April 2010 by Hixie (talk | contribs) (Created page with '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...')

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Lists of formats:

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.