Image Processing Reference
This is a very efficient codec at low data rates. Reckoned to be
about the best there is at those very low bit rates. However,
some testers report that the quality is not as good as with
Sorenson Video 3 or MPEG-4. The results depend very much on
the way you define parameter settings and the nature of the
video you are compressing. The availability of this codec may be
limited, and it must be downloaded as a QuickTime component.