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Possible HLG HDR bug in JRVR

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jmone:
MediaInfo does seem to report it.  That change from 14 to 18 changed:
Transfer characteristics from BT.2020 to HLG

...but I've no idea if the other tags are correct, or even if this is the right way of tagging such files.  I did not find any doco (did not look too hard) about what the corresponding values do in MKVToolNix GUI just a post of someone else with HLG MKV issues and this was their "fix". 

Hendrik:
Media Info is a bit imprecise. I would really prefer if it showed the source of information rather then just throwing it all together into one dump.

bogdanbz:
Ah I see, the "Original" was referring to the video stream, and the other line was referring to the final value, considering the container.


--- Code: ---Color primaries                          : BT.2020
Transfer characteristics                 : BT.2020 (10-bit)
transfer_characteristics_Original        : HLG / BT.2020 (10-bit)
Matrix coefficients                      : BT.2020 non-constant

--- End code ---
vs

--- Code: ---Color primaries                          : BT.2020
Transfer characteristics                 : HLG
transfer_characteristics_Original        : HLG / BT.2020 (10-bit)
Matrix coefficients                      : BT.2020 non-constant

--- End code ---

The value for "Transfer characteristics" was "BT.2020 (10-bit)", instead of "BT.1886" that JRVR used, so I didn't realize that's where the problem was.

jmone:
Maybe, but my other HLG test clip does not have a transfer_characteristics_Original at all (but it is an MP4) so that line may not even be required.  Also, I noticed over at github Hendrik has committed the following change

--- Quote ---Preserve HLG when a frame indicates it, instead of overriding it with…

… container data

Containers might indicate the corresponding SDR mode, but HLG is going
to be more precise here.
--- End quote ---

Anyway, looks like you're good to go for playback in MC.

bogdanbz:
It might be that "transfer_characteristics_Original" is only displayed in Media Info when the video stream has a different "transfer characteristics" than the "transfer characteristics" set on the container.

I remuxed the files yesterday and now everything plays properly.

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