Videos tearing

[Guilo]

I'm sorry but I don't understand what uvd and MC are.

What projects are you talking about ?

I don't think a P4 3.2 will quite do 1080 h264 (with a 2.1 GHz AMD I can only get 1/2 framerate on broadcast HD) it should be fine for 720.

My CPU played 1080p fine when I had my nVIDIA card...

Thanks

[legume]

I'm sorry but I don't understand what uvd and MC are.

What projects are you talking about ?



My CPU played 1080p fine when I had my nVIDIA card...

Thanks

UVD is the unified video decoder that is built in to recent radeon cards. It can releive the CPU of alot of work -

http://en.wikipedia.org/wiki/UVD

MC is motion compensation - a part of decoding mpeg video.

http://www.bitblit.org/gsoc/g3dvl/index.shtml

Fair enough if you could play 1080p, though 1080p may not be a good way to describe how much work your processor needs to do. It depends on the bitrate of the video as well.

[Guilo]

Thanks for your explanations.

The only 1080p movie I ever played was Big Buck Bunny and it was running fast when played with xv but quite slowly with gl

[Guilo]

Solution, at last

Hi all !

I just wanted to tell that I had found a solution while reading mplayer doc :

(no)force−pbo

Always uses PBOs to transfer textures even if this involves an extra copy. Currently this gives a little extra speed with NVidia drivers and a lot more speed with ATI drivers. May need −noslices and the ati−hack suboption to work correctly.

so :

mplayer -vo gl:force-pbo

works great : no tearing and fast decoding.

Hope it can help

[legume]

Hi all !

mplayer -vo gl:force-pbo

works great : no tearing and fast decoding.
Hope it can help

Cool glad you found a solution.

I tried it and using a recent mplayer couldn't get it to take the command without doing -

mplayer -vo gl:ati-hack,force_pbo

Unfortunately it still didn't stop ffmpeg h264 + -vo gl* eating pointless amounts of CPU in vo for me.

[mirak63]

I still have no video tearing, with -vo gl
but the 1080p videos are too slow, even on a quadcore q9300

that's really unacceptable to need to go on windows to watch videos

[mirak63]

this is still not fixed apparently

and I get a screen corruption when going in windowed mode in opengl video output

[vitalyb]

legume
Try -vf scale option. It won't scale anything and should not convert color space either... Virtually it does nothing but CPU usage is much lower sometimes. Have no idea why.

[legume]

legume
Try -vf scale option. It won't scale anything and should not convert color space either... Virtually it does nothing but CPU usage is much lower sometimes. Have no idea why.

Thanks - I tried and it did fix usage for a small youtube mp4, but it doesn't change things for some bbc quicktime/264 demos I tried.

I know these particular demos were OK with gl on an older mplayer + old fglrx on my old card (X1600). I wonder which one of the three regressed.

[vitalyb]

legume
Setting large cache for Matroska definitely helps, not sure about mp4/qt, though. Try -cache 8192