Video playback lags and jumps in Ubuntu on GeForce GTX 260

[daniboy]

Instead of describing the problem with words I filmed my screen while playing a video on YouTube
http://dl.dropbox.com/u/8224198/VID_20110317_143708.mp4
(This happens with local files and with any player, not just Flash)

vdpau doesn't seem to work:

daniel@Helo:~$ export VDPAU_TRACE=1
daniel@Helo:~$ export VDPAU_NVIDIA_DEBUG=3
daniel@Helo:~$ mplayer -vo vdpau -vc ffh264vdpau ~/Desktop/testh264.mkv 
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing /home/daniel/Desktop/testh264.mkv.
libavformat file format detected.
[matroska @ 0x15f0f00]Unknown entry 0x63C9
    Last message repeated 1 times
[matroska @ 0x15f0f00]Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (ac3), -aid 0, -alang eng, English
[lavf] stream 2: subtitle (unknown), -sid 0, -slang eng, English
VIDEO:  [H264]  1280x720  0bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)
Clip info:
 doctype: matroska
 track: 11
VDPAU capture: Enabled
vdp_imp_device_create_x11(0x16b9d10, 0, -, -)
VDPAU nvidia: Error detected 0 5356 
VDPAU nvidia: Backtrace:
--: /usr/lib/libvdpau_nvidia.so [0x7fbcede27000] DSO load base
00: /usr/lib/libvdpau_nvidia.so [0x7fbcede2c512] vdp_imp_device_create_x11
    -> 1
[vdpau] Error when calling vdp_device_create_x11: 1
Error opening/initializing the selected video_out (-vo) device.
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================
AO: [pulse] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A:   2.9 (02.9) of 2541.0 (42:21.0)  0.4% 
Exiting... (Quit)

(The video plays like the above demo when not calling mplayer with the vdpau parameters)

Video plays fine when I'm not using the nVidia drivers, although it lags when the video is Full HD
It also plays fine in Windows on the same machine (including Full HD)

Any ideas what can be done?

[daniboy]

bump?