wiki:

Limiting the output bitrate


Version 2 (modified by burek, 3 years ago) (diff)

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This page is a placeholder and is intended to describe how to use ffmpeg to produce the output of the constant (or maximum) bit rate. It should also explain the relationship between options -maxrate, -minrate and -bufsize and to show how to properly use those with ffmpeg.

For now, more info at the following link: http://superuser.com/questions/536001/variable-bit-rates-with-vb-and-minrate-maxrate-settings-in-ffmpeg