[FFmpeg-trac] #9463(avfilter:new): [FEATURE REQUEST] Filter Complex Subtitle Support

[FFmpeg]

#9463: [FEATURE REQUEST] Filter Complex Subtitle Support
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             Reporter:  Phillip      |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  wish
            Component:  avfilter     |                  Version:
             Keywords:  subtitles    |  unspecified
  trim filter_complex                |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 [FEATURE REQUEST]

 I am processing chunks of multiple videos and concating them all together,
 but I have to "manually" slice and merge each video's subtitles into
 intermediary files and merge outside ffmpeg which is slow and annoying.

 I have seen where you can overlay the subtitles - burning them - into the
 video stream directly but would prefer an option to include them as a
 togglable stream.

 The idea would be something like:
 [0:v]trim=start=0:end=30[v0];
 [0:a]atrim=start=0:end=30[a0];
 [0:s]strim=start=0:end=30[s0];

 Is there some reason this doesn't already exist that I am simply missing?
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Ticket URL: <https://trac.ffmpeg.org/ticket/9463>
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