What is "nominal bit rate"?

I'm trying to re-encode an mkv using x264 in videodub.

I'm looking to produce around an 8gb file, and v calc says the required bit rate is c. 8446kbit/s,. So i enter 8446kbit/s in the x264vfw configuration dialogue box.

Trouble is, the file size produced is 3.6GB, and mediainfo tells me that the bit rate is 3949Kbps, although the 'nominal bit rate' is indeed 8446Kbps.

Could some kind person please explain the above, and how i can produce a file with an actual bit rate of 8446 and a size of 8GB?

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4.11.09 08:33

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