[Theora-dev] ogg and keyframes
Thomas Vander Stichele
thomas at apestaart.org
Wed Sep 29 11:31:46 PDT 2004
> > 2) players don't show frames before they receive a keyframe.
> This has been suggested as a fix for dealing with lazy net streams that
> don't start by sending a keyframe, and of course lazy seek, but I'd
> rather it be handled by the player than libtheora. I added
> theora_packet_iskeyframe() to the api for facilitate this.
> I suppose it could be an option set through theora_decode_ctl().
When thinking more about this problem I was convinced that it cannot be
guaranteed by the server to start from a keyframe. Because if you're
sending out an ogg stream with *two* theora streams, you can't make sure
both of them start at a keyframe.
So it should be handled client-side.
Whether it should be in the lib or not is a different matter.
Personally, I'd feel the lib should do it, since really, what is it
decoding and then sending on to the app if it didn't have a keyframe
In other words, why would any application ever want to use any
information received *before* the keyframe ? If nobody needs it, there's
no point in sending that by default. Just MO of course.
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