[mythtv-users] Problems with vdpau decoding HD content

Alan Young ayoung at teleport.com
Thu May 13 18:29:15 UTC 2010

On 05/13/2010 08:15 AM, Scott Russell wrote:
> 1) CPU Starvation: confirmed in TOP that I was seeing 3-4% CPU usage when playing both 1080i and 720p video. The logs confirmed VDPAU was active as well. So most of the work should be happening on the GPU. I don't know of any tools to check for GPU starvation though.
> 2) IO WAIT - This is over the network from a BE to a FE. The BE is idle except for streaming to the FE for playback. I need to check my network though..

I found recently that if the resolution going to my TV didn't match 
modes in some way (possibly to the native TV resolution I'm not sure), 
there were may prebuffer waits occurring.  I'm not sure if this was a 
issue with the GPU being overloaded or a IO wait due to scaling or 
something else with the video card.  It's odd situation all around.  My 
TV/DFP's native resolution is 1368x768 and can accept a 1080I signals.  
I'm connecting with a DVI to HDMI cable.  I had specified 1920x1080 as a 
video mode.  But the video driver was changing it to 1280x720 and that's 
what the TV showed.  Anyhow... I found by adding a Option "TVStandard" 
"HD1080i" to the card's device section of the xorg.conf file, almost all 
the prebuffer issues went away and the TV now shows a resolution of 


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