ISO MPEG-4

• FourCCs: FMP4,fmp4,DIVX,divx,DIV1,div1,MP4S,mp4s,M4S2,m4s2,xvid,XVID,XviD,XVIX,DX50,dx50,BLZ0,mp4v,MP4V,UMP4,3IV2,3iv2,DXGM,SEDG
• Matroska CodecIDs: V_MPEG4/ISO/SP (Simple Profile), V_MPEG4/ISO/ASP (Advanced Simple Profile)

MPEG-4 part 2 video. Different encoders use different FourCCs to identify MPEG-4 content in AVI files, with DIVX, XVID, DX50, and FMP4 being most common. Strictly speaking, some of these FourCCs should refer only to simple profile rather than advanced simple profile, but this can not be relied upon.

This does not include H.264 video (MPEG-4 part 10).