I did a bunch of testing with HEVC mezz stuff a few years back. A 1 second max GOP duration did pretty well. A half second would seek even better and still have a lot of savings relative to IDR-only. Of course, that's presuming a good random access decoder which traverses the reference hierarchy and only encodes the frames it needs to.
Reducing --ref and turning off --b-pyramid would probably improve worst-case decode time, at the loss of some compression efficiency.
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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