FFDSHOW is a DirectShow decoding filter for decompressing DivX, XviD, WMV, MPEG-1 and MPEG-2 movies. It uses libavcodec from ffmpeg project for video decompression, postprocessing code from mplayer to enhance visual quality of low bitrate movies, and is based on original DirectShow filter from XviD, which is GPL'ed educational implementation of MPEG4 encoder. Features:

- fast video decompression using optimized MMX, SSE and 3DNow! code
- support for different codecs: XviD and all DIVX versions
- additional support for MSMPEG4v1, MSMPEG4v2, MSMPEG4v3 and H263
- can act as generic postprocessing filter for other decoders like MPEG1 or MPEG2
- image postprocessing for higher playback quality
- automatic quality control: automatically reduces postprocessing level when CPU load is high
- hue, saturation and luminance correction (MMX optimized)
... and more!

Download: FFDShow MPEG-4 Video Decoder