Perian enables QuickTime application support for additional media:
- 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, FlashADPCM, Xiph Vorbis (in Matroska), and MPEG Layer I & II Audio, TrueAudio, 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 only other program that I've found that can convert .mkv video files is Total Media Converter but this is not free. I'd rather use this, not only is it free, but it incorporates right into quicktime which is great.




