[mythtv-users] Major Audio Sync Issues

Mark Greenwood fatgerman at ntlworld.com
Wed Nov 18 20:13:32 UTC 2009

On Wednesday 18 Nov 2009 02:08:05 Paulin wrote:
> I'm been banging my head against the wall on this issue for a couple of days
> now.  I've search the thread and google for anything I can find on Audio Out
> Of Sync and I've tried a ton things.   No luck with any of it.
> I upgrade last week to Mythbuntu 9.10 (myth 0.22).  I'm using VDPAU.
> Before upgrading I didn't really have this issue.
> When I say upgraded I basically wiped the disk and started fresh.
> Anyway now the Myth Recordings that are occurring seem fine.  However when
> playing back the audio and video become out of sync.  I've noticed that the
> video will attempt to slow down to let the audio catch up but it never stays
> there.  They get out of sync and evenytually get really bad (few seconds).
> I've tried changing the player to VLC, I also tried the suggestion on (
> http://mythtvbox.blogspot.com/2006/01/fixing-mythvideos-audiovideo-sync.html)
> and put oss on the mplayer command string.  I also setup XvMC per the wiki
> page.  Didn't change anything.
> My first question is, how do I enable extended logging on myth frontend
> using mythfrontend.real.   I remember something about adding the parameter
> 'playback' but not sure how to do that with mythfrontend.real.
> Second why is my audio/video so out of sync? How do I track down the problem
> and fix it.
> Thanks
> steve
Have you tried enabling the setting 'Use Video As Timebase', somewhere amongst the reams of setup screens, TV playback I think? I did this for a similar problem, also with VDPAU, and it solved it.


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