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List:       theora
Subject:    Re: [theora] Reading audio data from an .ogv video
From:       Chris Pearce <cpearce () mozilla ! com>
Date:       2011-08-17 22:02:45
Message-ID: 4E4C3A85.2090308 () mozilla ! com
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Chris Double has a blog post outlining A/V sync in a simple ogg player:
http://www.bluishcoder.co.nz/2009/06/27/playing-ogg-files-with-audio-and-video.html

If you're interested I took his code and added seeking support, and it's 
available here:
https://github.com/cpearce/plogg
(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@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
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> theora@xiph.org
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