[mythtv-users] audio video sync errors.

greg greg12866 at nycap.rr.com
Wed Dec 23 16:49:09 UTC 2009


Kevin Johnson wrote:
> Running Mythbuntu 9.04 with mythtv.22 using the mythbuntu autobuilds. 
> Lately, (last week) I have been getting audio/video sync errors.  The 
> video will play ahead of the audio, then slow down, then speed up 
> again.  It never seems to be in sync.  This happens on recorded 
> programs or live tv.  BUT not all recorded programs or all live tv 
> broadcast.
> The audio sounds normal and stable.
> I have 3 separate front ends and they all exhibit the same issue. I 
> have one main backend. All the front ends use nvida cards, but not vdpau.
> I cannot say for sure but it appears to only happen on channels that 
> broadcast in 1080i or 480i, but I cant be completely sure of that.
> I have tried several different playback profiles and nothing solves it.
> ifconfig shows no network errors.
> The backend uses two ati hdtv wonder cards and a hdhomerun dual tuner.
>
> One other thing I should mention.  I get all my signal over the air 
> and it is not always stable.  I get alot of errors.
>
> 2009-12-22 22:24:06.691 [mpeg2video @ 0x7facf5ab1820]ac-tex damaged at 
> 41 9
> 2009-12-22 22:24:06.691 [mpeg2video @ 0x7facf5ab1820]mb incr damaged
> 2009-12-22 22:24:06.691 [mpeg2video @ 0x7facf5ab1820]mb incr damaged
> 2009-12-22 22:24:06.698 [mpeg2video @ 0x7facf5ab1820]Warning MVs not 
> available
> 2009-12-22 22:30:28.262 [ac3 @ 0x7facf5ab1820]frame CRC mismatch
> 2009-12-22 22:30:28.293 [ac3 @ 0x7facf5ab1820]incomplete frame
> 2009-12-22 22:30:28.293 [ac3 @ 0x7facf5ab1820]invalid frame size
> 2009-12-22 22:30:28.945 [mpeg2video @ 0x7facf5ab1820]Warning MVs not 
> available
> 2009-12-22 22:35:43.431 [ac3 @ 0x7facf5ab1820]frame CRC mismatch
> 2009-12-22 22:35:43.461 [ac3 @ 0x7facf5ab1820]incomplete frame
> 2009-12-22 22:35:43.461 [ac3 @ 0x7facf5ab1820]invalid frame size
> 2009-12-22 22:35:43.949 [mpeg2video @ 0x7facf5ab1820]invalid mb type 
> in B Frame$
>
> Only thing is, I have been using the same setup for over six months, 
> and this sync error just started happening.  That leads me to believe 
> that the poor signal is not the problem.
> Any help as this is very annoying.
>
>
>
>
>
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>   
Are you using Pluse Audio? When I was using it I had latency problems 
and the audio would go out of sync....If you are using it try removing 
it and see if your sync problems get any better..


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