[theora-dev] Re: [private] Re: [theora] support for theora in xine
giles at xiph.org
Tue Apr 22 13:07:57 PDT 2003
On Tuesday, April 22, 2003, at 05:12 pm, Andreas Heinchen wrote:
> Are there other easy possibilities to see if the opp_packet is an
> syncpoint? If not, could future versions of theora set the
> for every keyframe? That would make seeking a lot easier.
There's a hack with the granulepos to facilitate streaming: the
lower-order bits are always zero. The field is treated something like a
fixed-point number, with the fractional part incremented on P frames
and the integral part incremented only for key frames. Where exactly
the radix is is encoded as part of the packet header (the log of
keyframe_frequency_force) so you'll still have to pass that up from the
Hope that helps,
P.S. I've cc'd theora-dev, which is a more appropriate venue for this
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