May be whole thing is really not supported onWindows (!) in Free version, but  there was workaround posted that may be fix it for HEVC (x265) encoded files:

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Yes, try DNxHR which should be flagged properly and YT should detect HDR nature of the file.

You can "fix" those files with ffmpeg:

Code: Select all

fmpeg.exe -i C:\TestAsHDR.mp4 -bsf:v hevc_metadata=transfer_characteristics=16:colour_primaries=9:matrix_coefficients=9 -c copy  -movflags +write_colr C:\out.mov

This will add PQ flagging to your file.

Other solution is exporting to eg. DNxHR and encoding to h265 though 3rd party- ffmpeg, etc.

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interesting to note that even just 6 month ago whole HDR situation was ... still a bit of mess ;)