[Bug 71448] [UVD] qvdpautest is very slow on radeonsi (HD 7950)

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Comment # 24 on bug 71448 from
kwin desktop effects ON and glxgears
mplayer2 -benchmark -vo vdpau -vc ffmpeg12vdpau -nosound 1080p25.ts

BENCHMARKs: VC:   5.073s VO: 105.829s A:   0.000s Sys:   3.263s =  114.164s
BENCHMARK%: VC:  4.4433% VO: 92.6989% A:  0.0000% Sys:  2.8578% = 100.0000%

Mplayer better shows the behaviour I wanted to show with the previous video: it
takes *ALOT* of time to start the benchmark, but then it's quite fast. At least
while glxgears is running: in fact without glxgears it takes ages.

Here is a second video showing the lag I'm talking about:
http://www.youtube.com/watch?v=BDhB61U9S0A
As you can see when it starts decoding is quite fast.


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