Ghosting with RD=5

[Elyotna]

Hello,

I was recently testing slow vs slower and noticed a big decrease in quality in slower mode. Namely what I would call "ghosting", such as what happens on a cold screen where pixels can't update fast enough during movement.

So I did some digging by enabling all the new functions that appear from slow to slower one by one, and the culprit happens to be rd=5 (from rd=4). In the 3 frames below, look at the guy with a purple shirt, brown pants and green beer in his hand.

I'm using 1.7+37-dc4fcfc574ade14e - 8-bit

slow - 1

slow - 2

slow - 3

slow - RD=5 - 1

slow - RD=5 - 2 <== this is where it happens

slow - RD=5 - 3

As you can see, the rd-5 version has severe "ghosting". It may not seem much, but this is repeated several times during this guy's movement, and the video in itself looks very sluggish when played at 24fps. This is not the only person it happens to, anything with movement basically gets hit (more or less severely) by this artifact in the whole encode.