[FFmpeg-devel] Status and Plans for Subtitle Filters

[Nicolas George]

Michael Niedermayer (12020-02-23):
> really ?
> just hypothetically, and playing the devils advocat here.
> what would happen if one problem or set of problems is solved at a time ?

Odds are a design decision made early would prove insufficient to solve
a later problem.

> what happens if you forbid overlapping ?

We break perfectly valid subtitles. Unlike B-frames, overlapping
subtitles is part of the semantic.

> > - different semantics for duration (duration available, no known duration,
> >   event-based clearing, ...)
> This one is annoying (though similar to video where its just not so much an
> issue as video is generally regularly spaced)
> But does this actually impact the API in any way ?
> decoder -> avframe -> encoder

decoder → avframe → filters → avframe → encoder

Many filters need timing to work.

Regards,

-- 
  Nicolas George
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