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kross
Junior Member
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I made an interesting discovery regarding video playback on my 8200 IGP. Previously, I have mentioned that, even with the safe fullscreen patch, there were some videos that would still be a little jumpy in spots. mplayer and mythtv would play these same videos fine.
However, it seems I can play these videos in XBMC just fine if I set the CPU frequency to maximum. Previously I had it set to at least 1.8 GHz, which seemed to be fine for mplayer, etc. If I understand the technical details correctly, the memory controller is implemented on the CPU in the AMD architecture, so the speed of memory access by the GPU is affected by the CPU speed. This is not the case with Intel architecture.
I also discovered that I can reproduce the same jumpiness in mplayer, if I run glxgears fullscreen and then start up the video, even if I increase the CPU frequency to maximum.
So what this leads me to believe is that the XBMC UI must still be running and updating in the background while the movie is playing, and is consuming too much GPU bandwidth. Of course mplayer and mythtv don't have these fancy UI's that are constantly updating in the background like XBMC does, which would explain the difference.
Let me know if my thinking is way off base here. Hope this helps!
-- Kevin
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The XBMC UI only renders during video playback if you can see it.
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MrIcka
Senior Member
Posts: 102
2009-05-13, 14:11
(This post was last modified: 2009-05-13, 14:17 by MrIcka.)
I have a strange problem.
Running Ubuntu 9.04 and XBMC 9.04 (Final or SVN) VDPAU runs smooth and everyting is perfect.
But when I switch to the new XBMC session, 1080p playback is choppy... the same thing happens when running XBMC Live.
Something that is good is loading when gdm loads... =) but what?!?
Any one else having this problem?
My System:
8300 IGP
2 MB Dualchannel 800MHz
2 Athlon 3200+ running @ 2GHz
---------------- EDIT ----------------------
It's that strange starting fullscreen thing again i noticed... was there a script that run the \ key at startup?
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There is a known issue with 8x00 IGPs when running in fullscreen.
Investigations are needed, information about the results will be provided in due course.