search for: seekprerol

...9;m doing it right, but I'd love for someone more knowledgeable about Opus or WebM to take a look. The closest thing to a standards document for putting Opus into WebM is here: http://wiki.xiph.org/MatroskaOpus The muxing library I'm using (libwebm) doesn't seem to let me set these SeekPreRoll, CodecDelay, and DiscardPadding fields. Are these related to Opus' pre-skip field? SeekPreRoll is supposed to be standard, but there's no way to force the encoder to use a certain pre-skip, is there? While granulepos in the Ogg container gives you the actual number of PCM samples (incl...

...fnordware.com> wrote: > 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.ht...

...artz 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 > > _______________________________________________ > opus mailing list > opus at xiph.org > http://lists.xiph.org/mailman/listinfo/opus > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/opus/...

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 fundamenta...

...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