[mythtv-users] choppy sound on per-program basis.... (XvMC problem ?)

[Jules Gosnell]

Jules Gosnell wrote:

> Nick Parkinson wrote:
>
>> Your choppy sound problem sounds like it may be caused
>> by commercial skipping/flagging or whatever. I have a
>> via epia mii and was told that commercial skipping on
>> a low processor system such as epia would cause
>> trouble.
>>
>> I suggest you disable it in the settigns.  I think
>> there is an option in mythtv-setup and the general
>> settings.
>>
>>  
>>
> Nick,
>
> Sorry that it has taken me so long to get back to you - I've been on 
> holiday and then had to rebuild my myth-box after the disc got trashed...
>
> I'm not running any commercial skipping stuff. I guess that would be 
> run on the backend anyway, wouldn't it ?
> The problem occurs on my frontend box which is using XvMC MPEG 
> decoding and only taking between 5-15% cpu.
>
> Box is an EPIA VIA Ezra 1gz running 2.6.12-1.1378_FC3, FC3, 
> xorg-x11-6.8.2-37.FC3.ucr.30.8 and 
> kernel-module-via-drm-2.6.12-1.1376_FC3-2.6.3-2.ucr 
> (http://washington.kelkoo.net/epia/FC3/RPMS/) and latest myth from 
> atrpms (0.18.1-114) with libmyth-0.18.1-113.rhfc3.at. I haven't been 
> able to upgrade past this version of unichrome because of issues in 
> later versions on my architecture.
>
> Sometimes the choppiness occurs throughout the whole recording, 
> adverts and main feature, sometimes the adverts are fine and it 
> appears as soon as the main programme starts.
>
> I've tried playing with some of the other settings to no avail.
>
> I have tried disabling XvMC in setup to see whether the choppiness is 
> associated with that, but curiously this seems to have no effect and 
> the log still talks about VLD Surfaces etc...
>
So, I've now tried rm-ing my /etc/X11/XvMCConfig, commenting out the ref 
to "dri" in my /etc/X11/xorg.conf, rebooting, disabling XvMC in the 
setup menu and playing back a recording, but mythfrontend still insists 
on trying to use XvMC and fails to play completely :-(

Does anyone know what is happening and how I can get myth to run without 
XvMC support, just to see if this sound issue is related to XvMC or not ?

Cheers,


Jules

> If I play the same recording on another box (dual opteron x86_64, 
> without h/w MPEG) it runs fine without choppiness. I guess I will have 
> to work out how to switch off XvMC on my Via and run some more tests....
>
> Anyone any ideas?
>
> cheers,
>
>
> Jules
>
>
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"Open Source is a self-assembling organism. You dangle a piece of
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