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--slow-firstpass is only usable for insanely strict ratecontrol area.
If you balanced more toward quality at given rate scheme, you should prefer to use larger --ref, larger --bframes, all partitions, and most important of all, --me tesa, particularly you have limited rate requirement.
--rc-lookahead is also beneficial for some "normal" footages, and another parameter is --aq-mode 2
--merange is a controversial topic, generally, for those fine texture areas and constant intensity smooth areas, larger merange can cause irrational MV turbulent due to the invalid of optical flow equation.
Irrational MV may need extra bits to code, thus decreasing the efficiency. |
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