HDR export issue: image layer (jpg in rgb)

Help/How To
1

First of all, I’ve read this article and it’s helpful.
I managed to export 4K HDR videos via this extra lines for your reference:

vtag=hvc1
vprofile=main10
mlt_image_format=yuv444p10
pix_fmt=p010le
movflags=+faststart
color_trc=smpte2084
channel_layout=auto
rc=vbr

The facts: I recorded my HDR videos from games and edit it without previewing or adjusting color. I just do very simple cuts and voice over.

The result: fine for exporting the game videos themselfs. They maintained the same color space and looked fine in video players.

BUT!

I met the problem when I tried to add an image layer above the HDR video track because I wanted to indicated something in the game and provide extra info to viewers.

When exporting, this image layer went wrong in poor color display; they looked like with wrong Gamma and has bad color tuned (“a broken dark-red”).

These images are either jpg or png, in RGB. They looked fine in SDR videos.

I think I should change some line in there but don’t know which and how.
It looks like this one?

mlt_image_format=yuv444p10

OR, should I do something with those images in Photoshop?

Please please help if there is a solution to it!

Thank you so much :slight_smile:

2

Basically, SDR or sRGB in a HLG HDR project does not really work yet. But you can hack it in by doing various color adjustments. You need to figure out what works for you in that regard. There is no simple single setting or change somewhere. That is why preview in HDR is important, but only through Blackmagic Design peripherals at the moment. For those reasons, I do not claim Shotcut supports HDR (not announced, not on Features page).

3

The scaling required is fixed - it’s 58% for PQ (the OP isn’t using HLG, if he were it would be 75%), then a conversion from 709 to 2020

4

I think your answer inspired me, now I solved the problem by modified my images in Photoshop, converting them from RGB8 to RGB32 (with a PQ profile).
Then this worked for me.
Like I said, my input videos and output videos were quite fine in PQ. The only problem was the image layer, which I used to drag RGB8 jpegs directly without any pre-processing.

Thanks a lot anyway :slight_smile:

5

Thank you so much!
My problem was solved by changing colorspace of those images in Photoshop from RGB8 to RGB32.