By the way, a new build of MPlayer was released today. As promised, it contains some video decoding performance improvements for mpeg4 (up to 10% faster at about 1000kbps video files, this effect is smaller for lower bitrates). Also some video decoding artefacts are now gone as a side effect of replacing old buggy idct code. Most of the work for this optimization was done by Mans Rullgard, and some minor improvements were added by me