Sign In

makingedits

User Group
Members
Join date
22-Aug-2021
Last activity
22-Aug-2021
Posts
1

Post History

Post
#1445297
Topic
Info: Guide for Working with 4K HDR Blu-ray Rips in SDR
Time

44rh1n said:

CorellianSmuggler said:

Thank you for this. It’ll be very helpful.

I have a question. I want to take a UHD and edit the film. I want to keep the grading that it was released with, but do my edit, and be able to output the edited version with identical grading from the source, but with the new edit.

This used to be as easy as making an MKV of the film, converting it to ProRES, and then outputting a new ProRES after the edit. NOW when I try this, the color is washed out and completely off, and I believe I lose the HDR grading entirely.

I really appreciate the direction to process the MKV to ProRES 444, that’s good… but I still see it with the ungraded look. Is there a way to extract a LUT from the MKV?

Thanks so much for your help.

The color is “washed out” and “completely off” because it’s a Rec.2020 source, but your video editing application is assuming it’s a Rec.709 source. What software do you use to edit?

If you want to preserve the original HDR grading without making any modifications, then it should look washed out on your SDR display. That’s normal. And then in your timeline and export settings, you need to specify that it’s Rec.2020 ST2084 so that it doesn’t default to exporting in Rec.709.

This is a simple color management setting in DaVinci Resolve.

In other common editing programs, unfortunately, it’s complicated and sometimes not even possible to specify your timeline and output color space and gamma. So I recommend DaVinci Resolve for that reason.

HDR video will always look washed out on an SDR screen unless it’s being tonemapped. So when you’ve exported your film, you can try playing it in VLC or MPV to see it with the tonemapped colors. (Or just simply play it on an HDR TV).

Thank you for the tip! I have a question though. I am also trying to edit/trim a movie leaving the HDR color grading as is, while using an SDR monitor. The type of grading it has is HDR10, but I noticed something. When I play an unedited clip (before editing it in resolve), it looks washed out, as it should. But once I render it through DaVinci, the end product does not look washed out even on my SDR monitor. Am I doing something wrong? I was expecting it to look washed out but once I put it on my TV it will display correctly (my TV does detect the HDR, but still). I have tried other settings, and the one you described here as well but the situation remains the same. Should I assume its working as intended? I think this has to do with the very last thing you are mentioning in this post. I understand this is not quite on topic for the thread, as I don’t intend to convert to SDR or anything, just trying to preserve the HDR grading without tinkering with it. I haven’t touched the grading tab at all, and haven’t touched LUTs too. (By the way, I also read your other posts in this thread, thank you).

krausfadr said:

44rh1n, also of note regarding importing HEVC rips into resolve:
when I imported a “23.976” FPS 4k mp4 rewrapped from an mkv rip, resolve had severe sporadic framerate problems with the import itself, even with the “correct” master settings for timeline and playback (23.976). original 4K UHD disc framerate was actually variable unfortunately. some frames in the resolve import were duplicated resulting in occasional stuttered, laggy video (in timeline and in the final export), which I didn’t realize until far into the editing project when I stumbled across a duplicated frame. as a test, reimported a new project in resolve at 24 FPS in master settings (timeline and playback) with the same bad result. so then I imported the same mp4 into premiere and every frame was perfect (albeit no real HDR support). ultimately I had to use hybrid to create a prores which resolve imported perfectly with no frame issues. resolve is a great program but very buggy when it comes to certain things premiere handles with ease. using hybrid before the import to resolve is a reliable way to avoid possible issues.

EDIT: note in my original editing project I used cineform mov files exported from resolve. I don’t edit directly in HEVC or H264.

I have encountered this issue as well, I don’t really know Premiere as I really liked Resolve for the little I do. I tried all framerate settings at a project-scale, and clip-by-clip and it doesn’t work. The stutter happens every 40 seconds or so for 2-4 short bursts of duplicate frames replacing the frame right after it. I opened it in Premiere and the framerate is just fine. I’m going to have to learn the workflow from Premiere to Resolve…