stream id that AVI wants for MSMPEG4V3 doesn't work for ASF. I have
  added a flag to indicate that certain tags should not be used in ASF
  streams. I think that this is the wrong solution (just adding a flag
  for ASF), but it does work.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1112 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b