Nov 19, 2009
OS X Quick Tip #4 – Extend QuickTime Video Support
If you want to extend the video files that QuickTime can support on OS X a great little component to install is Perian.

Perian also known as ‘The Swiss-Army knife for QuickTime’ is open source and supports a wide range of formats, as stated on their site:
-
File formats: AVI, DIVX, FLV, MKV, GVI, VP6, and VFW
Video types: MS-MPEG4 v1 & v2, DivX, 3ivx, H.264, Sorenson H.263, FLV/Sorenson Spark, FSV1, VP6, H263i, VP3, HuffYUV, FFVHuff, MPEG1 & MPEG2 Video, Fraps, Snow, NuppelVideo, Techsmith Screen Capture, DosBox Capture
Audio types: Windows Media Audio v1 & v2, Flash ADPCM, Xiph Vorbis (in Matroska), and MPEG Layer I & II Audio, True Audio, DTS Coherent Acoustics, Nellymoser ASAO
AVI support for: AAC, AC3 Audio, H.264, MPEG4, and VBR MP3
Subtitle support for SSA/ASS and SRT
The Perian control panel can be accessed from the ‘Other’ section of your system preferences.
Enjoy!