Why doesn't mplayer work with VDPAU?

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http://askubuntu.com – I'm trying to play a HD video file, the command to play the video is: mplayer -vo vdpau -vc ffh264vdpau And the error I get is: [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 [mkv] Track ID 2: audio (A_AC3), -aid 0, -alang und [mkv] Will play video track 1. Detected file format: Matroska VIDEO: [avc1] 1280x720 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s) Load subtitles in . SUB: Could not determine file format [vdpau] Error when calling vdp_device_create_x11: 1 Error opening/initializing the selected video_out (-vo) device. =========================================================== (HowTos)