The description of Perian - Play With New Friends
Perian is a free plugin that enables QuickTime to play almost every popular video format. With Perian installed, any OS X application that uses QuickTime can now use these additional media types:Divx, XviD, FLV, AVIMS-MPEG4 v1, MS-MPEG4 v2, MS-MPEG4 v3, DivX 3.11 alpha, 3ivX, Sorenson H.263, Flash Screen Video, Truemotion VP6h.264, mpeg4, AAC, AC3 Audio, and VBR MP3 (when they are inside an AVI)Perian is a free plugin that enables QuickTime to play almost every popular video format. With Perian installed, any OS X application that uses QuickTime can now use these additional media types:Divx, XviD, FLV, AVIMS-MPEG4 v1, MS-MPEG4 v2, MS-MPEG4 v3, DivX 3.11 alpha, 3ivX, Sorenson H.263, Flash Screen Video, Truemotion VP6h.264, mpeg4, AAC, AC3 Audio, and VBR MP3 (when they are inside an AVI)Divx, XviD, FLV, AVIMS-MPEG4 v1, MS-MPEG4 v2, MS-MPEG4 v3, DivX 3.11 alpha, 3ivX, Sorenson H.263, Flash Screen Video, Truemotion VP6h.264, mpeg4, AAC, AC3 Audio, and VBR MP3 (when they are inside an AVI)Divx, XviD, FLV, AVIMS-MPEG4 v1, MS-MPEG4 v2, MS-MPEG4 v3, DivX 3.11 alpha, 3ivX, Sorenson H.263, Flash Screen Video, Truemotion VP6h.264, mpeg4, AAC, AC3 Audio, and VBR MP3 (when they are inside an AVI)