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Originally Posted by redbtn
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The broader question is what are the psychovisual and compression efficiency impact of the different modes. The documentation is tragically light on the "why" of this feature. SAO is fast enough that I don't see any direct perf advantage of this, although perhaps it might help parallelization in some esoteric way to only do SAO on non-predicted frames or something.
But if SAO detail loss varies somewhat by frame type, only using it on intra stuff might enhance detail with less of a compression efficiency hit than turning it off outright.