[FFmpeg-trac] #7292(ffmpeg:new): Implement Feature: Stretch Subtitles Timing by Factor

[FFmpeg]

#7292: Implement Feature: Stretch Subtitles Timing by Factor
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             Reporter:  MattMcManis  |                     Type:
               Status:  new          |  enhancement
            Component:  ffmpeg       |                 Priority:  wish
             Keywords:  subtitle,    |                  Version:
  subtitles, stretch, timing, time   |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 I'm looking to have a feature added, '''Stretch Subtitles''' by a factor
 [0.5, 100.0] range, like how `atempo` or `rubberband` works.

 https://ffmpeg.org/ffmpeg-filters.html#atempo
 https://ffmpeg.org/ffmpeg-filters.html#toc-rubberband

 '''Example:''' Something like `-substretch 3.0` (speed up 300%),
 `-substretch 0.5` (slow down 50%).
 Or as a filter `-vf "subtitles=stretch=3.0"`.

 The program '''MKVToolNix''' is able to do this under the "Timestamps and
 default duration" section.

 This would be different that `itsoffset`, which does not stretch, but
 shifts.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7292>
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