Power bit calculates fast and simply the optimal bit rate, which they must communicate then only to your MPEG Encoder. This value corresponds \"Avg. Bit rate \ "with the multi-passport VBR. noting you asks that the MPEG Encoder for technical reasons can never achieve the adjusted bit rate accurately. Leave therefore to something clearance (e.g. instead of 4675 kbps to take it 4500 kbps).