[FFmpeg-devel] [PATCH] attachments support in matroska demuxer

[Evgeniy Stepanov]

On Thursday 03 January 2008 04:23:09 Michael Niedermayer wrote:
> >   It seems to me that attachment would fit pretty well, each one
> >   in its own AVStream. Does this sound reasonable ?
> > - Here is how remuxing to other formats (avi, mov...) could work:
> >     * supported codec (jpeg poster) could be muxed as a normal
> >       JPEG stream with only one picture
> >     * ttf streams should be written in a separate file (that's
> >       the way various players expect to find ttf fonts when
> >       demuxing AVI, IIRC)
> >
> > - I think the only required API modifications to support this
> >   would be:
> >     * adding AVStream.filename and maybe AVStream.id_of_link_stream.
> >     * adding CODEC_ID_TTF ? (ugly, but shouldn't cause much trouble)
> >     * adding a way to mux ttf font in a separate file (maybe use
> >       a separate muxer for this, ie. call 2 different muxers from
> >       ffmpeg. seems ugly, but I've no better idea right now).
>
> Well, there are a few more things i think
> We need name / (mime) type to remux attachments
> (CD Cover / ? / tiff)
> (Fan art / image/x-photoshop / psd)
> There also could be other things like Author, ...

And what about stream count limit ? 20 is probably too low, I've definitely 
seen mkvs with more than 10 or even 15 attachments. Increasing it will break 
ABI and could still be not enough for some files.