[mythtv-users] Re: mplayer audio sync issues

Michael T. Dean mtdean at thirdcontact.com
Thu Jun 9 19:05:06 UTC 2005


Axel Thimm wrote:

>On Thu, Jun 09, 2005 at 09:15:03AM -0600, Adam Gianola wrote:
>  
>
>>Thanks Mike,
>>I will definitely try those things if I can.  I've been using mplayer
>>packages from ATRPMS, so I'm surprised if more people aren't having
>>this problem.
>>    
>>
>I for my part am not affected (snd-intel8x0), it looks like it is
>driver specific.
>  
>
Even on DivX/XviD files?  Previously they said they seemed to be the 
only ones affected.

OK, then, perhaps an easier test for the OP.  What happens with:

mplayer -ao alsa:device=atiixp -v /path/to/video_file 2>&1 | col -b | 
tee mplayer.log

This might not work with the file you tried last time (it has 44.1kHz 
audio, and your soundcard may only accept 48kHz).  If not, ideally, try 
to find a file that shows sync problems and has 48kHz audio (you may 
have to reset your audio device to default as shown below to play other 
videos/verify the sync problems again).

If you don't have an affected file with 48kHz audio, try replacing your 
.asoundrc with the one at the 
http://mythtv.info/moin.cgi/DigitalSoundHowTo#head-b318f22131b4a59eef5f28edfac9160204e13719 
(you may have to modify device numbers as explained in the post and if 
you don't have a digital output, just delete the digital stuff) and try

mplayer -ao alsa:device=analog -v /path/to/video_file 2>&1 | col -b | 
tee mplayer.log

Then try

mplayer -ao alsa:device=mixed-analog -v /path/to/video_file 2>&1 | col 
-b | tee mplayer.log

If all of that gives you the same results (with the sync 
delay--especially if it's the same with 48kHz and 44.1kHz audio), I 
really think you need MPlayer recompiled against alsa-lib-1.0.9 .

You'll probably have to reset your audio to default after finishing 
testing.  You can do this with:

mplayer -ao alsa:device=default -v /path/to/video_file 2>&1 | col -b | 
tee mplayer.log

Mike


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