[MPlayer-users] Some LADSPA plugins combined with -vo gl:yuv=[2346]:cscale=[1-5]:lscale=[1-5] result in blank screen

[Marcus Blumhagen]

Hi,

Please CC me in replies since I am not subscribed to the list.

I am using the latest SVN-Revision of MPlayer (dev-SVN-r28342-4.3.3)
with LADSPA support enabled. When I playback videos with the opengl
driver in combination with at least some LADSPA plugins, I cannot
enable cscale or lscale greater than 0 combined with yuv=[2346]. If I
would, mplayer will tell me this:

$ mplayer -vo gl:yuv=6:lscale=1:cscale=1 -af ladspa=/usr/lib/ladspa/sc4_1882.so:sc4:5e-1:15e-1:400:-30:20:10:24 video.avi

<snip>
[gl] Error compiling fragment program, make sure your card supports
[gl]   GL_ARB_fragment_program (use glxinfo to check).
[gl]   Error message:
  line 2, column 220:  error: expected '}'
line 2, column 566:  error: expected '}'
line 2, column 912:  error: expected '}'
 at ,000977};A
<snap>

and the screen will stay blank. /usr/lib/ladspa/sc4_1882.so belongs to
the swh-plugins package.

If I change either cscale and lscale to 0 or yuv to 0 or 1 the video
output works fine. The gl option nomanyfmts is no solution here.

If I don't use the LADSPA plugin at all, I can set arbitrary values
for yuv, cscale and lscale, i.e.:

$ mplayer -vo gl:yuv=6:lscale=1:cscale=1 video.avi

works just fine.

I tried some other LADSPA plugins to see whether this error only
happens with the above plugin. So I tried
ladspa=/usr/lib/ladspa/vcf.so:vcf_notch:0.5:45:0:0.01 which belongs to
vcf and it worked with the 1st example command line.

But ladspa=/usr/lib/ladspa/amp_1654.so:amp_gcia_oa:1 from the blop
package as another example results in the above error message again.

My graphics card is an NVIDIA GeForce 7800 GS AGP and I use the binary
NVIDIA driver in version 173.14.09. My system is an up to date Debian
Sid amd64. MPlayer was compiled using the debian/rules script supplied
in the svn repository with the following additional options:

--disable-pvr --disable-tv-teletext --disable-tv --disable-v4l2
--disable-dvb --disable-dvbhead --disable-ossaudio --disable-vidix
--disable-pnm --disable-fbdev --disable-tga

I believe this is a bug in mplayer, because loading an audio filter
should not affect the behavior of the video output driver IMHO.


Kind regards
-- 
Marcus Blumhagen

"Any intelligent fool can make things bigger, more complex, and more
violent. It takes a touch of genius -- and a lot of courage -- to move
in the opposite direction."
                                                      -- Albert Einstein