We limit the datarate to twice the average datarate (however the first
  few seconds are sent flat out to help with prebuffering).
* Add the initialization of the rc_eq fields and the like for VIDEO codecs.
* Add the missing get_arg calls for VideoQxxxx


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@920 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b