HEVC 10bit 1080p HDR10 "flashes" in S905X3

Hi.

I have CoreELEC 19.2 running in a S905X3 device, connected to a 2019 Sony Android TV.

I have noticed in some 1080p videos encoded with HEVC in 10bit and HDR10, that the image “flashes” from time to time.

Here is the MediaInfo of one of those videos:

Video
ID                             : 1
Format                         : HEVC
Format/Info                    : High Efficiency Video Coding
Format profile                 : Main 10@L4@Main
HDR format                     : SMPTE ST 2086, HDR10 compatible
Codec ID                       : V_MPEGH/ISO/HEVC
Duration                       : 47 min 24 s
Bit rate                       : 5 578 kb/s
Width                          : 1 920 pixels
Height                         : 1 080 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 24.000 FPS
Color space                    : YUV
Chroma subsampling             : 4:2:0 (Type 2)
Bit depth                      : 10 bits
Bits/(Pixel*Frame)             : 0.112
Stream size                    : 1.85 GiB (87%)
Default                        : Yes
Forced                         : No
Color range                    : Limited
Color primaries                : BT.2020
Transfer characteristics       : PQ
Matrix coefficients            : BT.2020 non-constant
Mastering display color primar : Display P3
Mastering display luminance    : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level    : 1050 cd/m2
Maximum Frame-Average Light Le : 274 cd/m2

My TV is configured with HDR set in “Auto” mode.

However, if I fix the TV HDR mode in “HDR10”, the video is played perfectly. Also, I play it directly in the TV itself with Emby Android app, there are no flashes at all.

That’s the reason I think that the HDR information is not well transmitted to the TV and, somehow, it doubts, disabling and re-enabling the HDR10 mode periodically, because it is HDR10 indeed.

Except these series of videos, I have been playing 2160p HEVC 10bit HDR10 movies without this kind of problems.

What do you think?

Thanks!

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