[Тормоза]видеоплееры

что mplayer выводит в консоль? пробуй с mplayer -vo xv, mplayer -vo x11, а также gl, gl2 и т.д.

Playing /enterprise/zone/video/benny hill show.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO: [DIVX] 576x432 24bpp 25.000 fps 1057.4 kbps (129.1 kbyte/s)
Clip info:
Software: VirtualDubMod 1.5.10.2 (build 2542/release)
xscreensaver_disable: Could not find XScreenSaver window.
[VO_XV] Could not grab port 355.
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 32000 Hz, 2 ch, s16le, 96.0 kbit/9.38% (ratio: 12000->128000)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
E: context.c: waitpid(): No child processes
AO: [pulse] Failed to connect to server: Internal error
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
VDec: vo config request - 576 x 432 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
VO: [xv] 576x432 => 576x432 Planar YV12

C gl gl2 пробовал. То же самое.

>Есть подозрения на обновлённые кодеки.

поставь из svn://svn.mplayerhq.hu/ffmpeg/trunk

есть подозрения, что надо пересобрать нвидиевские модули ядра.