The VideoLAN Forums

Hello,
first off all my System
Vista Home Basic
Geforce Go 6100
Nvidia Forceware 160.03 Vista Driver

In contrast to 0.8.6 b the videoplayback is now working.

But it's still very slow. VLC uses about 60% CPU 30 MB Ram to playback an XVID AVI

The same File played back with Media Player 11 with XVID 1.1.2 Final uses abou 28-40% CPU and only 24MB Ram

This is on default Video output.
If I switch to Windows GDI output the cpu usage reduces a little bit in comparison to default...

But VLC is still not working good with Vista

Have you switched your Video Output to Direct3D ?

I also tried Direct 3d but when I use it, some part of the video is okay and the rest is kind of blurry (strange effect)

If you need any more system details to improve your programm just ask me

Well, deactivate hardware acceleration YUV and use Direct3D. Does it work better ?

With disabled YUV Direct 3D works.

But vlc.exe still has around 30-50% CPU usage and 32 MB ram-usage.....

Does activating it breaks VLC ? Does MMX optimisations are removed or not ?

no direct 3D is working!


MMX and all other cpu features are turned on

You probably have to do some code optimization, to make vlc use less ram and cpu. media player is using up less resources and the dumb Microsoft people produced it

Well, this is a Vista only issue...

jeah, can u like get in contact with Microsoft?

Or is there a kind of debug option that might give you some information?
(I dont know if you have vista in your pc...)

I made a trouble ticket for the performance issue, seems Vista only: http://trac.videolan.org/vlc/ticket/1226

Good, you described it very well.

I have the same problem. On my Vista Computer VLC uses way too mutch CPU...

Maybe with your information the issue can be fixed. you seem to be more advanced than I am.

try --no-audio, that fixed most of my problems with high cpu

what do you mean by try --no-audio?

settings, preferences, audio, enable audio -> disable .. not really practical usage but it does seem the audio is causing a lot of high cpu in my case

what sense has a mediaplayer with no audio?

watching videos without audio is senseless

you are using all onboard devices, video and sound, thats normal

I'm merely ruling out that it is not necessarily a video problem but an audio problem. That's why I said it isn't practical. I also tried on-board and a PCI card and the issue is the same. But it would help if more people are able to reproduce that the audio part is the culprit.

What sort of CPU are you using? If it has demand based throttling (Speedstep, Cool&Quiet,..), the cpu% figure could be overstated because the cpu may be running at a lower clockspeed than maximum.
On my system, the reported cpu% for VLC when the rest of the system is loaded is 3 times as high as with an otherwise idle system.