sum of the output of the rc equation, this is used for normalization
number of RateControlEntries
bits which should have been outputed by the pass1 code (including complexity init) ...
amount of bits in the video/audio buffer
last qscale for a specific pict type, used for max_diff & ipb factor stuff
void * non_lavc_opaque
context for non lavc rc code (for example xvid)