VC-1 -
VC-1 is the informal name of the
SMPTE
standard 421M that describes a video
codec
based on Windows Media Video version 9. On April 3, 2006,
SMPTE
announced the formal release of the VC-1 standard as SMPTE 421M.
http://en.wikipedia.org/wiki/VC-1
See the Interactive Television Institute.