Expanding the V.U.I menu to support BT2020 and other newer formats in...

I have some video files that have BT2020 and BT2020NC colors that I'm trying to encode. This is my new phone camera that uses these as Primaries and Matrix. I always choose the correct values to make sure the colors are right, but the current MeGUI version doesn't include these as an option in the dropdown menus.

I know the X264 that's included supports these values since you can check x264.exe --fullhelp and it'll show you a lot more options than MeGUI has, including the BT2020 and BT2020NC. I even encoded a file with primaries and matrix set to these via commandline and the file shows the right info from mediainfo and the colors match the original, but when I put this "--colorprim bt2020 --transfer bt709 --colormatrix bt2020nc" (while leaving MeGUI's own settings to undefined) into MeGUI's Custom Command Line option, begin encoding the file and take a look at the "Job command line" log, it shows it didn't include the bt2020 and bt2020nc at all, and neither does the output file.

Maybe this is because it doesn't recognize these, since it doesn't show them in the dropdown menu either. I know I could just encode everything via commandline but it's a lot smoother and faster just picking the right options from MeGUI, so this would be great to get implemented, or fixed so that MeGUI would forward the correct values and not just drop the ones it doesn't recognize.

This is my first post here so bear with me, but I'm not new to encoding, been processing my own camera videos since 2009. Thank you!