CBR, VBR, 2PASSVBR on MXE3500

[markel.usandizaga]

Does anybody know why if I set a maximun bitrate for all VBR modes on h264 encoder, then I transcode a video, and then analize this video with tools like bitrate viewer... and the maximun bitrate is over the one I set on the MXE? And also, in the CBR mode you should set the average bit rate, is this CVBR mode instead of CBR mode?

Thanks. 

[markel.usandizaga]

Here the answer:

"The relationship between the average bit rate and the peak bit rate is often misunderstood. The peak bit rate describes a buffer constraint over a period of time specified by the peak buffer window. The average bit rate for two-pass VBR (unconstrained or peak-constrained) is the average bits per second over the duration of the file."

http://msdn.microsoft.com/en-us/library/windows/desktop/ff819493%28v=vs.85%29.aspx