FLV Crunch converts one video file format into another. Who would want to use this program? Anyone who likes watching digital video on their computer, DVD player, PDA, iPod, iPhone, Apple TV, or any other device. You could turn a video you downloaded from YouTube into something you can use with iMovie, iDVD, iTunes, Quicktime Player, and others.

It can accept as input:
MPEG 1 (.mpg),
MPEG 2 (.vob),
MPEG 4 (.mp4),
Quicktime (.mov),
Cell Phone videos (.3gp),
Windows Media Player files (.wma, .wmv),
RealPlayer files (.ra, .rm),
Divx AVI (.avi),
Digital Video (.dv),
MP3,
M4A,
MKV,
MKA,
M4V,
AIFF,
MOD,
FLAC,
and WAV files.

It can convert input files into:
MPEG 1,
MPEG 2,
MPEG 4,
Quicktime Mov,
Divx AVI,
3GP,
Digital video,
Windows Media Video,
FLV,
MKV,
MP3,
M4A,
and AIFF.

Requirements:
OS 10.1- 10.6
OS 10.7+ is not supported - but will probably still work
Universal Binary