[mythtv-users] Major Audio Sync Issues

Paulin paulin at spextreme.com
Wed Nov 18 22:24:45 UTC 2009


On Wed, Nov 18, 2009 at 3:13 PM, Mark Greenwood <fatgerman at ntlworld.com>wrote:

> 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.
>
> Mark
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>
>
I'm going to have to hook up the monitor (when it's on the TV i loose 1 inch
around all margins) again and check all of those settings. I believe I do
but I want to check that and a couple of the others.

Thanks,
steve
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