Hi-
It seems to say how many frames ahead the encoder can look to figure out how best to average out the overflows. Doom9 has this to say about it:
Quote:
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Rate control averaging period: How many frames the codec will look at the determine the bitrate of the frame to encode. If previous frames have used much bitrate the codec has to average that by giving upcoming frames less bitrate so it can keep the bitrate you set. The default 2000 seems a pretty reasonable value, but you can experiment with higher setting and you may find that they give better results. Setting it higher will decrease the ability of the encoder to adapt to low/fast motion scene changes and you may not get a predictable size anymore.
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I've been leaving it at default, but based on what I've been reading, I think setting it for half the movie may result in slightly better quality. I expect it will slow down the encoding a bit though. But maybe there are some people around here that have experimented with it and can chime in.