[opus] Exact audio position

Ian Malone ibmalone at gmail.com
Mon May 13 09:42:26 PDT 2013

On 13 May 2013 09:45, Hermann Weber <hermie.weber at gmx.de> wrote:

> Hello!
> I need to extract audio data at a certain position in respect to the
> original audio data.
> Is the "-cbr" switch meant to ensure that data can be found on a
> specific position?
> I want to be able to predict where certain audio can be found in the
> encoded data.
> An example:
> If you put 10 apples into a box and then compress the box, you will not
> be able to predict where apple C can be found in the box.
> Perhaps apple B could be compressed more than apple C, and now the
> "position" of apple C is not predictable anymore.
> This is exactely NOT what I want :-)
(Oops, replied off-list by mistake)

The encapsulation records this information, for Opus in Ogg you want
'granule position':

I'm less familiar with RTP, but I think the RTP timestamp is probably the
equivalent thing:

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/opus/attachments/20130513/4a30dc2e/attachment-0001.htm 

More information about the opus mailing list