Hi! Most important, you did not say what -vo you're using or if you`re scaling the video. If you e.g. use -vo x11 and zoom in software, that probably won't work well with HD on any machine, may it be as fast as light. > 1. I have a 3 GHz Pentium 4, 1 GB of RAM and an Nvidia 6600GT. Does this > provide sufficient processing power? What hardware would you suggest for > watching HD movies comfortably? That sounds OK, if the NVidia is not PCI. AGP should do it, PCIe is best. > 2. mplayer 1.0~rc2. Has it improved significantly in SVN? Thanks to some very quick responding developers, MPlayer seems to me to have significant updates in estimated average twice a week. So you can guess how much behind the version from over a year back is. > 3. What works best (but not perfectly) is -lavdopts > threads=2:fast=true:skiploopfilter=all:skipframe=nonref. -mc and > -autosync > don?t seem to help. What can be added here? I would check the way the decoded video reaches your hardware first, not the decoder side. Good lock! Kiste