Removing HDR

[leotwo]

Hi there, i have a question.

I am encoding a HDR UHD Blu-ray and reducing the resolution to 1920x1080.

In FastFlix i tick "Remove HDR" and select BT.709 for color primaries, transfer characteristics and matrix coefficients. This all looks good in the mediainfo for the final result.

However there is a line in the mediainfo above these that says "HDR Format: SMPTE ST 2086"

So my question is, is this "ok"? Is the HDR actually removed? Or is there another software/HDR remover that i should or could use instead?

[ProWo]

You could use clever FFmpeg-GUI.

[stamatis87]

What is the best way to convert 4K HDR to 4K SDR from a full quality 4K Blu-ray ripped with MakeMKV?

I want it to be a 1:1 copy of the ripped MKV but convert 4K HDR to 4K SDR with no video quality loss.

[dannyboy48888]

It won't be 1:1 as hdr is metadata applied to the compressed stream. Remove only will cause extremely off colors. You'll have to reencode and use a filter like dghdrtosdr, a ffmpeg chain, or a program that has a setting to renencode in sdr colorspace from hdr. Avidemux can preview with it but haven't tested the encoding part of it.

[Selur]

Here's an example:

On the left, an HDR video without the HDR data and on the left the same after some tone mapping with DGs HDRtoSDR.

[Cornucopia]

Just a reminder as an FYI, only 4k Blurays support HDR, standard HD Blurays do NOT.


Scott