[MPlayer-users] stripes in image with (x)mga and ffmpeg on G200

[Diego Biurrun]

Hello!

OK, this was a helpful hint, I get the following results when changing
resolution and bitdepth:

               16bpp            24bpp
800x600          o                o
1024x768         o                -
1152x864         -                -
1280x1024        -                -

o = picture ok, - = stripes in picture

But what is going wrong?  And why only in one specific vc/vo
combination?  Is this a mplayer problem or a low level driver issue?
I do not really want to change my display resolution just to watch a
movie, unless it is full screen, but the problem does not appear when
viewing full screen..

One more question, what is RAM access contention supposed to mean in
this context?  I would be most delighted if somebody could educate me
on the matter.
Thanks

Diego


Brent Roman writes:
 > Diego,
 > 
 > I saw a very similar problem with my K6-2 500Mhz
 > system driving an NVidia TNT2 board.  Thin Black
 > and sometimes colored streaks that trail off to the right
 > of the video image when using the xv driver.
 > 
 > It looked like a Video RAM access contention issue to me, so I tried
 > lowering the bits/pixel from 24 to 16 and/or lessening
 > the screen resolution.  Either action cleared up the problem
 > immediately.  So, I'm pretty well convinced that was it.
 > 
 > It may be that some setting in the video driver is the root
 > cause of the problem, but I havn't dug much deeper into it.
 > 
 > I am curious to know whether others have seen similar
 > (mis-)behavior.  Please let me know what you find out...
 > 
 > - brent
 > 
 > 
 > From: Diego Biurrun <diego at biurrun.de>
 > > One problem remains, though.  I have a divx file that gets thin
 > > horizontal black stripes in the right half of the screen when played
 > > with "-vo (x)mga -vfm 5".  When played in fullscreen or with -vo xv or
 > > -vo x11 or without -vfm 5 it runs fine but considerably slower.
 > 
 > > I tried with latest CVS as well as 0.6, gcc 2.95-4 and 3.0.3, always
 > > the same problem.
 > 
 > > I have a K6-2 500 and a Matrox G200 AGP card with 8MB SGRAM.  I run X
 > > 4.1.0 with the Matrox 1.4.3 drivers, although I also tried the Xfree
 > > builtin driver with the same result.  My soundcard is a Creative SB
 > > Live! running the stock kernel drivers.