I think you need mplayer compiled with vdpau support. On karmic I think this is the case. You also need support from your video driver and card. Eg NVIDIA ion. Finally I believe that only certain codecs work with this. H264 being one of them . <blockquote type="cite">On Dec 18, 2009 2:50 PM, "javadayaz" <<a href="mailto:javadayaz@gmail.com">javadayaz@gmail.com</a>> wrote: <div dir="ltr">ok stupid question but do i have to switch the hardware acceleration bit "on"? Is it automatic? <div class="gmail_quote">2009/12/18 Alan Pope <<a href="mailto:alan@popey.com" target="_blank">alan@popey.com</a>> > > Mplayer supports VDPAU. >> >> On Dec 18, 2009 2:21 PM, "javadayaz" <<a href="mailto:javadayaz@gmail.com">javadayaz@gmail.com</a>> wrote:...</div> -- Regards Javad </div> -- <a href="mailto:ubuntu-uk@lists.ubuntu.com">ubuntu-uk@lists.ubuntu.com</a> <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk</a> <a href="https://wiki.ubuntu.com/UKTeam/" target="_blank">https://wiki.ubuntu.com/UKTeam/</a> </blockquote>