[mythtv-users] Re: mplayer audio sync issues

Noel Murphy bnmurphy at rogers.com
Wed Jun 8 01:43:34 UTC 2005

Just want to add my 2 cents for the archives. I switched the mlayer  
launch string to use oss and my sync issues went away.

On 7-Jun-05, at 12:59 AM, Axel Thimm wrote:

> On Mon, Jun 06, 2005 at 06:02:26PM -0600, Adam Gianola wrote:
>> Thanks Axel for the quick response.
>> It is certainly puzzling, and I only just noticed it the other  
>> day, it
>> could have started happening when I updated on May 28, though I'm not
>> certain.  The old alsa I had been using was 1.0.8, but its wierd in
>> that only xvid/avi is affected, and I'm using mplayer within and
>> outside of mythtv with identical results, though it looks like  
>> mplayer
>> hasn't been updated for quite a while.  Nothing in the diff's stick
>> out like a sore thumb.  When I get the chance, I'll think about
>> switching back to alsa 1.0.8 and report back....
> Or you can use mplayer with oss to verify it's the alsa libs. Also
> what CPU load do you have during playback?
> If you find that this is a bug in alsa, please report to
> https://bugtrack.alsa-project.org/, thanks!
>> Thanks again,
>> Adam
>> On 6/6/05, Axel Thimm <Axel.Thimm at atrpms.net> wrote:
>>> On Mon, Jun 06, 2005 at 09:52:09AM -0600, Adam Gianola wrote:
>>>> Yes this is exactly the problem, and its been easily corrected  
>>>> for me
>>>> with the -delay option.  I also noticed it happened after an  
>>>> 'apt-get
>>>> dist-upgrade' and I'm pretty sure alsa was updated then (as well as
>>>> most mythtv packages).  The alsa rpms I'm running must be:
>>>> alsa-kmdl-2.6.10-1.770_14.rhfc3.at-1.0.9rf-39.rhfc3.at
>>>> alsa-driver-1.0.9rf-39.rhfc3.at and alsa-utils-1.0.9rf-14.rhfc3.at
>>>> alsa-lib-1.0.9rf-21.rhfc3.at
>>>> libasound2-1.0.9rf-21.rhfc3.at
>>>> which look like the current versions on atrpms.  i'm not  
>>>> entirely sure
>>>> what the old versions were, but it had been at least 2 weeks or so
>>>> since the last dist-upgrade.  I haven't looked at the atrpms  
>>>> list, but
>>>> i'm cc'ing this message to that list in the hopes that the right
>>>> people notice this and may be able to comment if it is an rpm  
>>>> problem
>>>> or not.
>>>> FWIW, my mainboard is
>>>> SOYO SY-P4RC350 Socket 478 ATI 9100IGP (RS300) Micro ATX Intel  
>>>> Motherboard
>>>> with onboard sound
>>>> ATI Technologies Inc IXP150 AC'97 Audio Controller
>>>> Thanks,
>>>> Adam
>>>> ps. is there a simple way to list the previously installed alsa
>>>> packages or downgrade?  my mind is failing me right now...
>>> Try
>>> rpm -qa --qf '%{name}-%{version}-%{release}.%{arch}.rpm\n' 2>&1 |  
>>> sort > /tmp/rpmpkgs
>>> ls -ltrA /var/log/rpmpkgs* /tmp/rpmpkgs
>>> diff -ud /var/log/rpmpkgs /tmp/rpmpkgs
>>> etc.
>>> But I can't imagine alsa delaying sound. It has to be an issue with
>>> the client application. Perhaps the ABI changed in an incompatible
>>> way?
>>> FWIW I don't see (well, hear) any such delays.
>>>> On 6/5/05, Marshall Crocker <marshall at iconux.org> wrote:
>>>>> I had the exact same problem last week after updating from at- 
>>>>> rpms.  A
>>>>> number of packages were updated but I noticed that alsa was one  
>>>>> of them
>>>>> so maybe it's the cause? It seems that only divx/xvid files are  
>>>>> the
>>>>> problem though.  No problems with any other formats so far.
>>>>> I haven't had any luck tracking the problem down but I may  
>>>>> downgrade
>>>>> alsa and see what effect that has.  Has your alsa recently been  
>>>>> updated?
>>>>>   If so what were the previous and current versions?
>>>>> Marshall
>>>>> Adam Gianola wrote:
>>>>>> Hey folks,
>>>>>> Maybe I'm hallucinating (it is entirely possible), but  
>>>>>> suddenly when I
>>>>>> am watching videos using mplayer in 'watch videos' my audio is  
>>>>>> out of
>>>>>> sync with the video.  If I manually adjust to +0.275s by adding
>>>>>> '-delay 0.275' to the mplayer command line, it looks better.   
>>>>>> This
>>>>>> only seems to happen with videos played using mplayer (xvid  
>>>>>> avis in
>>>>>> particular), but when I watch recorded videos (from pvr 250)  
>>>>>> they are
>>>>>> fine.  This only started happening in the last few days,  
>>>>>> before this,
>>>>>> videos which have the mismatch worked fine.  I'm just curious if
>>>>>> anyone else has seen this recently.  I've got a FC3 setup using
>>>>>> ATRPMS.
>>>>>> Thanks,
>>>>>> Adam
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> -- 
> Axel.Thimm at ATrpms.net
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