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[Selur]

Should I worry?

Who knows, not knowing what you are worried about, hard to tell,...

That mediainfo reports that:
1. the encoding setting for x265 used colormatrix=9 which should be BT.2020 non-constant, this is what you configured
2. the colormatrix signaled by the stream (_Original) is BT.2020 non-constant, this seems to be correct
3. the colormatrix signaled by the container is BT.2020 constant, this seems to be wrong
I don't know what settings you used and can't say whether there is a bug or you misconfigured something.

I guess it's a bug caused by some refactoring I did, but since I don't even know what output container you are using I don't even know where to start looking for it.
=> provide a proper debug output then I can look at it.

Cu Selur