[mythtv] Re: Alsa version (was: [PATCH] Reinitialize deinterlace filter on video change)

[Jarod Wilson]

On Wednesday 06 October 2004 10:21, Joe Barnhart wrote:
> --- Jarod Wilson <jcw at wilsonet.com> wrote:
> > However, its
> > got me thinking with respect to ALSA and some of the
> > problems others
> > have reported with 1.0.6... Perhaps a rebuild
> > against different ALSA
> > libs is worth a try, I've been building against what
> > I believe is the
> > version folks have had issues with...
>
> I don't know if this is important...  I am using
> S/PDIF out, just like you, but I'm using oss for my
> digital audio output.

I have now tried both ALSA and OSS, and they behave pretty similarly. Both 
start out playing the clip back just fine for a second, then OSS goes into 
constant audio stutter w/slow-motion video, while ALSA goes silent for the 
most part w/slow-motion video, and occasional blips of audio.

Okay, wtf, just tried something at work I swear I tried already, and now I've 
got smooth 720p audio and video playback. Prior to this, I was using a build 
w/o any ALSA support on my work machine (since the machine only has OSS 
drivers installed), but I just rebuilt against alsa-lib-devel 1.0.4 (from 
kde-redhat), and now things are happy (though still using only OSS for 
output). The key setting this time around seems to be enabling extra audio 
buffering, which I'm pretty damned certain I've tried several times, both at 
work and at home... I guess I've got a few more things to try out when I get 
home... I'm going to be bald before I turn 30 at this rate... ;-)

> I think there's something weird going on with audio
> and video because sometimes my XvMC will hang and the
> log says "waiting for prebuffer..." and "prebuffer
> timed out..." forever.  The hang occurs when I skip
> forward or back, at about the time the OSD should fade
> away.

I have no problems w/skipping around or OSD fade. What's your cpu utilization 
like? Maybe skipping and OSD fades are pushing it to the brink?

-- 
Jarod C. Wilson, RHCE
jcw at wilsonet.com

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