[opus] Opus in WebM

Monty Montgomery monty at xiph.org
Tue Jan 21 10:20:26 PST 2014

It does not; Vorbis needs only lap consecutive frames, and the timing was
constructed so that the 'timestamp' of a vorbis frame actually points to
the middle of the frame data.  When you combine a starting frame with the
subsequent frame, the data you get back is from the starting timestamp
forward. Because Opus needs to preroll a larger amount, that trick wouldn't
work with Opus.


On Tue, Jan 21, 2014 at 1:00 PM, Brendan Bolles <brendan at fnordware.com>wrote:

> On Jan 17, 2014, at 2:19 PM, Benjamin Schwartz wrote:
> > Yes, it's basically an intrinsic aspect of the mathematics.  If you seek
> into the middle of an Opus stream, that's about how long it takes before
> the audio converges to be correct.
> Do you happen to know if Vorbis has a similar need to do a SeekPreRoll?
> Brendan
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