[mythtv-users] MythVideo audio sync

Raymond Wagner raymond at wagnerrp.com
Wed Oct 5 19:10:57 UTC 2011

On 10/5/2011 14:58, Stefan D wrote:
> I have a few videos that works fine in mplayer but in Myth i get very 
> jerky video and sound. Get the following errors:
> 2011-10-05 20:49:44.870072 W [10793/16831] Decoder 
> avformatdecoder.cpp:4230 (GetFrame) - AFD: Audio 1381 ms behind video 
> but already 180 video frames queued. AV-Sync might be broken.
> It is some kind of HD wmv file i think. Should Myth be able to play 
> files as good as mplayer, or is the video file to blame?

MythTV and mplayer both run off the same set of video decoding libraries 
provided by the FFmpeg project.  In theory, they should both be equally 
capable players, but of course different forks from different times, and 
different optimizations applied to each are going to cause problems.  It 
is entirely possible there is a flaw in MythTV's handling of such files 
that has yet gone unrecognized, as there is simply so little use of them.

What hardware are you playing this on?  What playback profile are you 
using?  'wmv' is a pretty broad description, encompassing several 
generations of video encoding.  Do you know specifically what format the 
video is in or the bitrate?  If not, use 'mplayer -identify' to print 
out this information.

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