11.3.2Subset 2: Wiener-based in-loop filters
Discussed above.
11.3.3Subtest 3: Controlled clipping and offset
Operating the controlled clipping as an outside-the-loop post-process was reported to be adequate. The clipping range in the reported experiments was established at the whole-frame level based on the range observed in the input video data (e.g. using multi-pass encoding).
It was remarked that such an outside-the-loop indicator could be sent using an SEI message (or something similar).
Regarding the offset proposal (sending a quadtree and sending an offset for each leaf): 1-2% gain.
It was remarked that this seems related to weighted prediction. This led to the discussion reported in the next section.
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