[mythtv-users] Occasional jerkiness during DVD playback
Brian Wood
beww at beww.org
Sat Jun 23 23:20:57 UTC 2007
Juergen Botz wrote:
> Brian Wood wrote:
>>> But when playing DVDs, once in a while, usually on scene changes
>>> where the whole field is different, I get a few seconds of jerky
>>> video and stuttering sound.
>> If you are getting your "20%" CPU load number from top, remember that it
>> is an average, and the peak usage might be well in excess of that.
>
> Yeah... right after I sent that message I played a DVD and watched
> top carefully and noticed something peculiar...
>
> The CPU usage seems to follow a kind of reverse sawtooth pattern,
> I.e. it's low for a while (15%-20%) then jumps up to something like
> 60% around the time of the jerkiness. Then it slowly goes back
> down.
>
> Looks like a bug, either in in Mythtv or in the XvMC library or
> openchrome driver.
>
>> How fast is your CPU?
>
> It's an EPIA SP 13000 board... so the CPU is slow, maybe equivalent
> to a P3 800 at most. Before I got XvMC working video was frequently
> jerky and the CPU was usually at 70-80%.
That's pretty marginal. I think you're right on the edge, even with XvMC
>
> There's nothing other than Mythtv using resources on that box right now.
> I run mythfrontend directly from xinit.
Well you *do* have something other than MythTV - You have X running,
perhaps you could optimize that a bit. Make sure no other stuff is
running, a lot of distros start daemons that you really don't need.
Also see if you're hitting swap.
BEWW
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