x265 settings for re-encoding 4K BD near-losslessly

[FranceBB]

Originally Posted by Blue_MiSfit

Similar here, using DaVinci Resolve and a Decklink interface to render the HDMI.

Almost the same, but in the office the Blackmagic Decklink is outputting via SDI instead.

[benwaggoner]

Originally Posted by FranceBB

Almost the same, but in the office the Blackmagic Decklink is outputting via SDI instead.

I've done it that way too. With HDMI 2.1, I can get all the HDR10+ and DoVi metadata working like it would in the field, which is also useful. My old rig let me do it both ways, and I was surprised to find myself not really going back to SDI almost ever.

[blublub]

CRF=12 - thats crazy. At this setting does it even make sense to encode/re-encode something? - I mean file size and time taken into account?

A few years back I did quite some test and depending on source material I could not see a diference with 4K encodes at CRF 19, so I stuck with 17 or 18 depending on source material.

Thats what I used so far:

no-sao:rd=4sy-rdoq=4:me=3:subme=2:aq-mode=1:rskip=2: qcomp=0.75:bframes=4:ref=5sy-rd=2:deblock=-1,-1:level-idc=51:high-tier:rc-lookahead=30:vbv-bufsize=160000:vbv-maxrate=160000:asm=avx512:frame-threads=8:hdr10-opt

[benwaggoner]

Originally Posted by blublub

CRF=12 - thats crazy. At this setting does it even make sense to encode/re-encode something? - I mean file size and time taken into account?

Almost certainly not. I've used CRF=12 to make a new mezzanine to incorporate some video processing, sure. But it'll be bigger than the source for most examples.

[rwill]

Originally Posted by coopzr

Hello brains trust,

I need to re-encode a movie to bake the DV-FEL into the HDR10 base layer (the FEL expands brightness).

Sounds pretty mezzanine style to me.