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

Michael Niedermayer michaelni
Tue Jan 1 13:36:48 CET 2008

On Tue, Jan 01, 2008 at 01:27:11PM +0100, Michael Niedermayer wrote:
> The only way to see fonts as special relative to global data (=extradata)
> would be if one argues that a subtitle decoder outputs UTF-8 + position
> + font name + color + size + ...
> in that case fonts would be an rendering hint but unneeded for decoding
> the subtitle stream (as the decoder doesnt output bitmaps ...). 
> the problem here is that this is not how subtitles
> are currently implemented in libavcodec so if you want to pursue this
> direction you would first need to extend the existing subtitle handling
> to output such textual rendering info instead of bitmaps.

note, having subtitle decoders output UTF-8 + position + ...
also allows easy transcoding between subtitle formats, so this might be
the best solution
if that is done, then putting fonts in a seperate stream as extradata
with a CODEC_ID_TTF or so might make some sense ...

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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