grab the essential codec pack from here...
http://www.mplayerhq.hu/homepage/design7/dload.html
supported video and audio codecs
most important video codecs:
* MPEG1 (VCD) and MPEG2 (SVCD/DVD/DVB) video
* MPEG4 in all variants including DivX ;-), OpenDivX (DivX4), DivX 5 (Pro), XviD
* Windows Media Video 7/8 (WMV1/2)
* Windows Media Video 9 (WMV3) (using x86 DLL)
* RealVideo 1.0, 2.0 (G2)
* RealVideo 3.0 (RP8), 4.0 (RP9) (using Real libraries)
* Sorenson v1/v3 (SVQ1/SVQ3), Cinepak, RPZA and other QuickTime codecs
* DV video
* 3ivx
* Intel Indeo3 (3.1, 3.2)
* Intel Indeo 4.1 and 5.0 (using x86 DLL or XAnim codecs)
* VIVO 1.0, 2.0, I263 and other H.263(+) variants (using x86 DLL)
* MJPEG, AVID, VCR2, ASV2 and other hardware formats
* FLI/FLC
* HuffYUV
* various old simple RLE-like formats
most important audio codecs:
* MPEG layer 1, 2, and 3 (MP3) audio
* AC3/A52 (Dolby Digital) audio (software or SP/DIF)
* AAC (MPEG4 audio)
* WMA (DivX Audio) v1, v2
* WMA 9 (WMAv3), Voxware audio, ACELP.net etc (using x86 DLLs)
* RealAudio: COOK, SIPRO, ATRAC3 (using Real libraries)
* RealAudio: DNET and older codecs
* QuickTime: Qclp, Q-Design QDMC/QDM2, MACE 3/6 (using QT libraries)
* Ogg Vorbis audio
* VIVO audio (g723, Vivo Siren) (using x86 DLL)
* alaw/ulaw, (ms)gsm, pcm, *adpcm and other simple old audio formats
linux_terror