[mythtv-users] Prebuffering Pause and memory
myth at dermanouelian.com
Thu Aug 28 20:59:14 UTC 2008
On Aug 28, 2008, at 1:46 PM, Michael Wisniewski wrote:
> Thanks for the response. I don't want to beat a dead horse because I
> know that this has been brought up many of times.
> Since it's not swapping (according to the 'free -o' command), then
> poor disk i/o can be ruled out.
Just because you're not swapping doesn't mean your disk is definitely
delivering the data fast enough. Probably is, but not certainly.
> It's all on the local machine, so I
> can rule networking out. Finally, I don't believe it to be bad source
> material because the source is fine. So, what else can it be?
CPU could be too slow.
> For what it's worth, it usually only seems to pop up if I'm in the
> guide or right after I change channels. After a few minutes of
> watching hte program after changing channels, it goes back to normal.
> Now with HD content, it seems to happen more often along with jagged
> motion (not pixelation). The jagged motion almost looks like it's due
> to a high utilization in the processor and/or memory/swap.
Yup. Your deinterlacer is using lots of CPU cycles when there's lots
Also, if you're using a double frame-rate deinterlacer like Bob
(notice the X2 next to it) it means it's trying to read a frame ahead
of what's displaying to see how the deinterlacing should happen
between the frames. That's a lot to ask of a CPU and disk when you're
dealing with very big video files.
Do you get the prebuffering pauses on 720p or 1080p content or simply
when you turn off the deinterlacer manually?
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