[FFmpeg-devel] metadata updates while playing

Michael Niedermayer michaelni
Fri Mar 20 05:27:51 CET 2009

On Fri, Mar 20, 2009 at 12:10:20AM -0400, Ronald S. Bultje wrote:
> Hi,
> RTP/ASF apparently has this interesting thing "medata updates" while
> the radio plays. This is used to continuously inform the extremely
> interested user on which top-40 artist is currently making your life
> miserable^d^d^d.
> Anyway, here mux/audio-out sync comes in to play again. How would you
> want this to be handled? The data basically comes in a caption channel
> (like audio/video, but "application" - similar in many ways to
> subtitle except that it's not very useful) and could thus be handled
> by a "decoder" to convert to UTF-8 and keep sync. If I go that route,
> how would the decoder signal the metadata updates to the application?

the metadata belongs to the demuxer layer and can be stored in or similar
to AVChapter. (though caremust be taken here as its not guranteed to be
chapters though then again in case of radio it could be considered

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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