[mythtv-users] AV-Sync problem

[David Wong]

----- Original Message -----
From: "greg" <greg12866 at nycap.rr.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Wednesday, April 15, 2009 3:09:11 AM (GMT+0800) Asia/Hong_Kong
Subject: Re: [mythtv-users] AV-Sync problem

David Wong wrote:
> Hi all,
>
> I am running 0.21 branch with VDPAU patch #r20300, on NVidia 9400 IGP with Intel Q2D E7400 2.8GHz.
>
> When I play some of DTV channel in my living place, I got lots of following warnings:
>
> "Audio 686 ms behind video but already 75 video frames queued. AV-Sync might be broken. "
>
> and some audio buffer underrun error, both video and audio are not smooth.
> Video output resolution is not important too.
>
> It only happens in 2 SD H.264 channels from same broadcaster here.
>
> It looks like that audio packet, in form of libavformat packet?, is very lag behind video.
> It is not very surprising as the two channels are rather low bit rate. Broadcaster makes very extreme
>  configuration to accommodate 1 HD and 3 SD channels in a 21Mbps carrier.
>
> I check into the code. It seems the playback engine only checks enough video when pre-buffering,
>  and left audio buffer unchecked. Is my observation valid? Are there anyway to both ensure enough
>  video and audio before playback?
>
> Or anyway to buffer more data? I think it is better to be measured in time rather than in data size.
>
> Regards,
> David. 
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>
>   
I used to have this problem until i removed pulseaudio... Try removing 
it and see if that resolves your problem..
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I tried "sudo /etc/init.d/pulseaudio stop" in my Mythbuntu 8.10.
Unfortunately, it doesn't help.
Thanks anyway.

David