[mythtv-users] 0.25 Major AV sync problems

[Richard]

On 03/06/12 11:25, David Moore wrote:
> Audio/Video sync has not been good for me ever since I upgraded to 
> 0.25. But since I haven't seen others complaining I wonder if I have a 
> config problem. Here's what I see:
>
> - OSD of Playback Data frequently shows A/V Sync values of around -2 
> and never "pulls in" to lower values without user intervention.
> - Actual AV sync is not as bad as -2 seconds but is a large fraction 
> of a second.
> - Seeking forwards or backwards almost always degrades AV sync.
> - Pausing/unpausing usually, but not always, helps AV sync.
> - Seeking back to the start of a recording loses sync for a few 
> seconds and sometimes never recovers. Audio and/or video may break up. 
> Ridiculously huge AV sync values are shown in the OSD and frontend log.
> - After seeking to the start and breaking sync it seems seeking 
> forward recovers sync.
>
> So am I the only one seeing this? If so, what is the magic config 
> option that I'm missing?

I'm getting this too.  Playback data shows A/V sync generally at around 
+/-2.  Pausing/unpausing usually seems to fix it (A/V sync goes to 
something like 0.17).  Skipping makes it worse.

I haven't been able to do too much playing around with it but it seems 
that even after pausing/unpausing, after a while I notice it's got out 
of sync a bit.  When I could check, I think A/V sync was showing around 1.x.

I thought it might only be on HD/AC3 content but I think it happens on 
SD/MP2 stuff too.  All my recordings come in via DVB-S(2).

At least the pause/unpause trick generally seems to work but it doesn't 
help the WAF when I have to do it several times during a recording (she 
doesn't seem to notice but it drives me up the wall!).

Richard.