[theora] Reading audio data from an .ogv video

Chris Pearce cpearce at mozilla.com
Wed Aug 17 15:02:45 PDT 2011

Chris Double has a blog post outlining A/V sync in a simple ogg player:

If you're interested I took his code and added seeking support, and it's 
available here:
(There are a few bugs in the seeking code I've not fixed, but it works 
most of the time).

Chris Pearce.

On 18/08/2011 8:48 a.m., Ralph Giles wrote:
> On 17 August 2011 11:10, Nuno Moreira<nscarnaut at hotmail.com>  wrote:
>> I need some info on how can I read the audio data from an .ogv video.
>> I'm creating an in-game player and so far I'm only able to read and render
>> the frames of the video (no audio). Tried splitting the video from the sound
>> but it got out of synch really quickly.
> Sounds like you're reading the audio data correctly, and the problem
> is just in your synchronization code. Sound cards generally don't have
> very accurate clocks, so you need to schedule video playback based on
> the audio playback clock. For example, keep track of how often the
> audio engine requests a new playback buffer and update the visible
> video frame based on that.
> HTH,
>   -r
> _______________________________________________
> theora mailing list
> theora at xiph.org
> http://lists.xiph.org/mailman/listinfo/theora

More information about the theora mailing list