Re: mplayer vdpau
octapus, I believe our HW is targeted at 1080p @30fps maximum for real-time. As such, your 60fps stream may simply be too much work for the HW to handle in real-time (although a lot depends on the exact content of the stream).
However, this may not be the only thing working against you; displaying 60fps content on a 60Hz display does need some care to achieve good video synchronization. I believe the SVN versions of MPlayer don't handle this well due to the fact they don't use the VdpPresentationQueue's timestamp-based presentation, nor feedback features for frame-dropping. I believe there are various git versions that attempt to address this.