SDK seems to use gop-ref-dist 3 by default. Are higher values recommended like 4 and 8? I found one video with a colour distortion when using gop-ref-dist 4. Not sure if this is a bug. It puzzles me that some videos look better with different gop-ref-dist numbers. Very different behavior.
What gop-pic-size is used by default from the SDK? I can't find a number and it's almost impossible to reproduce the number used by the SDK.