HEVC not playable on my LG Ultra HD TV

[klode]

I have a LG 55UH850V ULTRA HD 3D Slim TV.
Among the features is the ability to play MKV videos with the HEVC codec. There are currently two broad types of HEVC: 8-bit (SDR) and 10-bit (HDR).
By downloading videos from some sites that display both 8-bit and 10-bit HEVC videos, both videos can be played on the TV, either via an external hard drive or via DLNA (Windows 10 File Sharing).

This TV, however, does not play some videos, although they can be viewed on the PC.

I want to display the MediaInfo data for the following files:

https://pastebin.com/Yt2NLTM2 - HEVC 4K SDR 30fps - WORKS!
https://pastebin.com/GisFUGZu - HEVC 4K HDR 30fps - WORKS!
https://pastebin.com/Z0baW1kw - HEVC 1080p SDR 23,976fps - DOES NOT WORKS!!!!

I can't find the problem where my TV refuses to play a file like this.
Can anyone solve this mystery for me?

[ProWo]

1) HEVC 4K SDR 30fps - WORKS!
2) HEVC 4K HDR 30fps - WORKS!
3) HEVC 1080p SDR 23,976fps - DOES NOT WORKS!!!!

3) is a failed HDR-to-SDR conversion in which all HDR metadata has been preserved.

HDR format : SMPTE ST 2086, HDR10 compatible
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0000 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000
MaxCLL_Original : 1000 cd/m2

Your TV should still be able to play the video, though.
I suspect that Profile Level 4 is the problem.
Change the level to 3.1 or 4.1.

You can do this with Clever FFmpeg-GUI.
Load your HEVC 1080p SDR 23.976 fps MKV file, click “Lossless Changes,” check “Change Profile Level,” select 3.1 at “New level” and click “Change.”
A new video with profile level 3.1 is created in streamcopy (fast, without recode, no quality loss).
Test the new video on your TV.

[klode]

1) HEVC 4K SDR 30fps - WORKS!
2) HEVC 4K HDR 30fps - WORKS!
3) HEVC 1080p SDR 23,976fps - DOES NOT WORKS!!!!

3) is a failed HDR-to-SDR conversion in which all HDR metadata has been preserved.

HDR format : SMPTE ST 2086, HDR10 compatible
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0000 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000
MaxCLL_Original : 1000 cd/m2

Your TV should still be able to play the video, though.
I suspect that Profile Level 4 is the problem.
Change the level to 3.1 or 4.1.

You can do this with Clever FFmpeg-GUI.
Load your HEVC 1080p SDR 23.976 fps MKV file, click “Lossless Changes,” check “Change Profile Level,” select 3.1 at “New level” and click “Change.”
A new video with profile level 3.1 is created in streamcopy (fast, without recode, no quality loss).
Test the new video on your TV.

Thanks for your suggestion. I-ll try ASAP. Let me check.

[klode]

There is the new result from MediaInfo:

https://pastebin.com/YXvULnf9

However I've got the same error. Should I need to correct the ColorSpace too?

[ProWo]

There is the new result from MediaInfo:

https://pastebin.com/YXvULnf9

However I've got the same error. Should I need to correct the ColorSpace too?

Have you tried 3.1 as well?
The color space is fine (BT709), but there's some leftover HDR metadata that you can't remove without re-encoding.

[klode]

Yes I've tried 3.1 too, same issue.
But I wouldn't re-encode the file... Is there no solution to remove that metadata?

[ProWo]

Yes I've tried 3.1 too, same issue.
But I wouldn't re-encode the file... Is there no solution to remove that metadata?

You could try the following:

ffmpeg -i input.mkv -c copy -bsf:v sidedata=delete=MASTERING_DISPLAY_METADATA,sidedata=delete=CONTENT_LIGHT_LEVEL output.mkv