[mythtv-users] Occasional jerkiness during DVD playback
Juergen Botz
jurgen at botz.org
Sat Jun 23 21:37:15 UTC 2007
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%.
> I'd start by playing the DVD outside of Myth,
I'll try mplayer (if I can verify that it works with XvMC)... that
way I can eliminate or verify Mythtv as being the source of the
problem.
> with as little else
> running as possible, and see if you get the same problem. If it's OK,
> and re-appears as you add more running apps, you might need to think
> about a lighter-weight window manager (or no window manager) or
> otherwise reducing resource load.
There's nothing other than Mythtv using resources on that box right now.
I run mythfrontend directly from xinit.
:j
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