[INFO] Change input color

[Selur]

You can read the debug output and see where Hybrid comes up with the value,...
I suspect, x264 doesn't support the values of your source and Hybrid tries to use something similar,..
this is what x264 supports:

--colorprim <string>    Specify color primaries ["undef"]
                                  - undef, bt709, bt470m, bt470bg, smpte170m,
                                    smpte240m, film, bt2020, smpte428,
                                    smpte431, smpte432
      --transfer <string>     Specify transfer characteristics ["undef"]
                                  - undef, bt709, bt470m, bt470bg, smpte170m,
                                    smpte240m, linear, log100, log316,
                                    iec61966-2-4, bt1361e, iec61966-2-1,
                                    bt2020-10, bt2020-12, smpte2084, smpte428,
                                    arib-std-b67
      --colormatrix <string>  Specify color matrix setting ["???"]
                                  - undef, bt709, fcc, bt470bg, smpte170m,
                                    smpte240m, GBR, YCgCo, bt2020nc, bt2020c,
                                    smpte2085, chroma-derived-nc,
                                    chroma-derived-c, ICtCp

see: x264 --fullhelp

Cu Selur

Ps.: alternatively share a sample with these characteristics and I can look at it over the weekend.