[mythtv-users] playback getting A/V diverged, extending frame to keep audio in sync

[Doug Larrick]

Henry Chin wrote:
> I am looking into why my playback sometimes is choppy.
>  Looks like the prebuffering pause scenario.  Ran
> mythfrontend -verbose playback and I get the
> following:
> 
> 2004-10-30 02:01:28 A/V diverged by 3.26713 frames,
> extending frame to keep audio in sync
> 2004-10-30 02:01:28 A/V diverged by 3.52928 frames,
> extending frame to keep audio in sync
> 2004-10-30 02:01:28 A/V diverged by 3.49362 frames,
> extending frame to keep audio in sync
> 2004-10-30 02:01:28 A/V diverged by 3.20464 frames,
> extending frame to keep audiio in sync
> 
> I assume the extending frame to audio in sync is
> causing the extra CPU load on my X server.
> 
> Seached in archives and did not find anything useful. 
> Wondering if this has something to do with the refresh
> rate of my tv screen?  Any ideas?

Means the audio is playing slower than the video, so Myth needs to 
micro-pause the video to let the audio catch up.

Yes, it could be that the refresh rate of your screen is unsuitable for 
the video you're playing.  You can fix this by messing about with your 
modeline ... there are good resources in previous discussions on this list.

Or it could mean that the audio sample rate is different from what your 
card can play back.  You can fix this by changing the recording profile, 
assuming you're not doing HDTV or DVB.

-Doug
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