[FFmpeg-devel] Status and Plans for Subtitle Filters

[Hendrik Leppkes]

On Thu, Feb 27, 2020 at 12:35 PM Anton Khirnov <anton at khirnov.net> wrote:
>
> Quoting Hendrik Leppkes (2020-02-27 12:27:09)
> > On Thu, Feb 27, 2020 at 12:18 PM Anton Khirnov <anton at khirnov.net> wrote:
> > > Why does it need to be within AVFrame? I am still unconvinced that is a
> > > good idea. What do we gain from storing them in the same struct?
> > > It makes sense for audio and video, because they are similar in many
> > > important aspects (and even then there are people saying that they
> > > should be separate). Subtitles are even more different.
> > >
> >
> > You gain a unified API, which we already have now, intead of a
> > secondary API just for subtitles thats practically the same but
> > accepts different structs.
> > This makes everything a lot easier imho. You can decode whatever input
> > data into an AVFrame, you can filter your AVFrame, still without
> > needing special data paths, and only at the last step after all of
> > that do you need to possibly care when it comes to output. If you're
> > encoding again, you might not even have that.
>
> AFAIU one of the still-open questions for the subtitle redesign is what
> does it mean to decode or encode a subtitle. And one of the options is
> putting the AVPacket->"decoded subtitle" (whatever that is) and "decoded
> subtitle"->AVPacket conversions into a separate library.


FFmpeg really doesn't need *more* libraries.