[Mplayer-advusers] Bug? Anomalous CPU usage when playing HDTV clips.

[John Stebbins]

Follow up to my last e-mail.

Another variable in this is option PageFlip.  It was on in the
tests given in my last e-mail (speeds up glxgears).  When turned
off, results are like the non-dbe results below.

This led me to try the gl drivers again and take a closer look.
They are buggy, so I've been ignoring them until now.

Using the vo gl, CPU usage actually looks pretty sane
for both 1280x720 and 1024x576 @ 30fps.  mplayer runs 
between 20% and 30%, X is negligible. But 1280 has 
broken video, nothing but a white display.  Also, higher
fps clips do not play at correct speed.

Using the vo gl2, nothing plays at the correct speed.
mplayer CPU usage is high, but below 60%, so its not 
due to pegging out the CPU.

On Fri, 2004-03-19 at 16:14, John Stebbins wrote:
> Ivan, I couldn't find an easy way to disable VSync in the X 
> drivers. I'm not even sure all the configurations I tried this
> on have VSync capability.
> 
> I'm not sure what you are referring to with regard to checking
> AGP tuning/speed.  All systems tested are AGP 4x.
> 
> I have been running some additional experiments that may shed some
> more light on the problem.  I would say that this is some problem
> with X alone, but look at the last test that I run below.  There is
> some very odd interaction that involves image size, fps, and
> X extensions being used that also affect mplayers cpu usage.
> 
> Here's an interesting one.  Double buffering extension(dbe) 
> seems to have some odd effects.
> 
> I ran a series of tests using:
> 1280x720 @ 30fps clip
> 1024x576 @ 30fps clip
> xv output
> x11 output
> dbe enabled
> dbe disabled
> 
> Results
> -------
>                          X CPU         mplayer CPU
> 1280x720,xv,dbe          30            30
> 
> 1280x720,x11,dbe         30            30
> 
> 1280x720,xv,no-dbe       30            30
> 
> 1280x720,x11,no-dbe      negligible    30
> 
> 1024x576,xv,dbe          negligible    30 (you would think mplayer CPU
>                                            should have dropped here by
>                                            50% due to smaller image size)
> 1024x576,x11,dbe         negligible    30
> 
> 1024x576,xv,no-dbe       negligible    30
> 
> 1024x576,x11,no-dbe      negligible    5-20 (mostly under 10) HUH!?
> 
> 
> >I've just got another (simplier) idea.
> >It could also be connected with VSync (changing picture
> >on retrace). You can test this by increaseing monitor
> >vertical refresh rate. Or finding option to disable
> >VSync.
> >
> >--- Ivan Kalvatchev <iive at yahoo.com> wrote:
> >> Hmm quite interesting.
> >> My quess is that the you may have reached AGP limit.
> >> Could you check your AGP tunning/speed?
> >> Best Regards
> >   Ivan Kalvachev
> >  iive
> 
> 
> 
> 
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