vo: X11 running at 1024x768 with depth 16 and 16 bpp (":0.0" => local display)
It seems there is no Xvideo support for your video card available.
Run 'xvinfo' to verify its Xv support and read DOCS/HTML/en/video.html#xv!
See 'mplayer -vo help' for other (non-xv) video out drivers. Try -vo x11
Error opening/initializing the selected video_out (-vo) device.