[mythtv-users] Re: mplayer audio sync issues

[Axel Thimm]

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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