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Old 24th September 2011, 16:46   #9846  |  Link
Andy2222
Registered User
 
Join Date: Nov 2003
Posts: 179
Hi Madshi,

i noticed a "strange" problem on my new media box, during playback in windowed/fullscreen windowed mode and even during pausing a file the CPU/GPU is still active at around 35%/20%?
I did some tests and even reinstalled windows and found one combination of setting that "fixes" this behavior, resulting in 0% CPU/GPU usage. Also the CPU usage in general is higher in all the "problematic" cases.

Here are my setting on Win7, madVR 0.74, MPC-HC (1.5.3.3734). I also tested other players, with the same result. Also process explorer shows the CPU usage in the "madvr.ax" process.

The first case is the "fixed" version which solves this problem only in this particular setting combination. Note how the "exclusive" mode changes directly also influences the windowed mode playback.

FIXED 1:
general: "enable automatic exclusive fullscreen mode" = ON
exclusive: "present several frames in advance" = OFF

FAIL 1:
general: "enable automatic exclusive fullscreen mode" = ON
exclusive: "present several frames in advance" = ON

FAIL 2:
general: "enable automatic exclusive fullscreen mode" = OFF
exclusive: "present several frames in advance" = ON/OFF

NOTE: All other settings scaling, presentation, thread, number backbuffers ... don't influence the outcome. I did not test all the sync options (flush, wait) and did leave those at default values.

Test-System Spec:
Win7 32bit (all updates + SP1)
Pentium T630 CPU + H67 chipset (Intel HD GPU not used, no driver installed)
nVidia GT 520 GPU (280.26 drivers)

I also tried to duplicate this problem on my main Core2Duo 775 system under WinXP and Win7, but could not do so.

In general all the "fail" settings also result in 30% higher additional cpu usage during playback, compared to the "fixed" case. As a side-note the playback is "smooth" in all tested cases, without any dropped frames. CPU and GPU usage is never above 70% in total.

bye Andy

Last edited by Andy2222; 24th September 2011 at 17:02.
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