"ffdshow is a very powerful DirectShow filter can decode various audio and video formats. For example: DivX, XviD, MPEG-4, H.263, H.264, MPEG1, MPEG2, MJPEG, CinePack, TrueMotion, DV, ASV1/2, VCR1, VP3, huffyuv, Theora, AAC, AC3, DTS, MP2, MP3 and TrueAudio. When using ffdshow you don't need to install separate DirectShow filters for all of these formats."