I’m blogging this just in case I need a reference in future. Having hunted for OSX Quicktime codecs, I can appreciate something like Perian (an almost all-in-one Quicktime component):
Perian is a Quicktime component that will allow you to play all kinds of files including the most popular ones. (Divx, XviD, FLV, AVI ). The list goes on. Also supported are MS-MPEG4 v1, MS-MPEG4 v2, MS-MPEG4 v3, DivX 3.11 alpha, 3ivX, Sorenson H.263, Flash Screen Video, Truemotion VP6.