[opus] Opus in WebM

[Brendan Bolles]

On Jan 7, 2014, at 11:11 AM, Brendan Bolles wrote:

> The closest thing to a standards document for putting Opus into WebM is here:
> 
> http://wiki.xiph.org/MatroskaOpus


I'm curious about the part there where it says SeekPreRoll should be set to 80000000.  I believe those are in nanoseconds, so that's 0.08 seconds, 3840 samples at 48kHz.  Here's a page explaining that it means I need to start decoding that far before the samples I actually need:

http://matroska.org/technical/specs/index.html

Is this a fundamental property of the Opus codec that you need to do that?


Brendan