I haven't really done any comparison tests myself but I always set the rc averaging period to 1/2 the # of frames.
No one has confirmed it for me but my opinion of setting it to half is so that you can retain utmost filesize predictability, eg. the rc averaging period ends on or very close to the end frame. By this reasoning you could set it to one third or one quarter etc.
If you were to set it at three quarters for example the video would finish part way through the averaging period, potentially messing with the filesize predictability.
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