Running 2-pass on capped CRF (aka Constrained CRF) is redundant and a waste of time. Now, take that concept and think about applying ffmpeg's 2-pass model to it. This forcibly limits the freedom of the CRF algorithm with respect to its upper limit of bits-per-frame. The purpose of which is to constrain/limit the overall file size to a pre-defined maximum. The author's point was to describe "capping" or constraining the CRF setting by creating a bandwidth ceiling per frame. I'm not sure you gathered the spirit of that article as intended.
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