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Why do you ask us that? Just look at your encodings and decide if you wanna spend 2x the time for the difference. How can we decide that for you?
I always use at least slow if possible, cause it shows a pretty nice improvements when going from medium and I dont mind the extra time cause its still doable for me. But I dont see much point going much lower then slow, especially with the new preset changes were very slow is now almost as placebo levels of encoding times. I think very slow is 15x times slower then slow now, and you will have to be very bitrate starved to be able to tell the two apart. If you are under crf~20 i wouldnt botter with something like very slow. And if medium isnt looking good enough, well just lower the crf if time prevents you from going slower.
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