[HELP] "BT.709 or BT.2020?" But…

[Selur]

Okay so you suggest that I can convert the color matrix using the colormatrix filter. What about scale? I kinda prefer that more. It should not make any difference, right?

Yes, Color matrix changes through scale should work too.
Important remember to also change the vui flags otherwise your content will still be displayed wrong.

-vf scale=in_range=pc:out_range=tv hoping it would fix this color shifting issue. Unless I'm wrong, I think converting to a different 8-bit color range would prevent players from misinterpreting things. Or am I being an idiot again for not putting out_range=pc instead? Or is this whole idea pointless once again? Assume I will properly set the flags

-vf scale=in_range=pc:out_range=pc

should do nothing, so using it doesn't make sense.

So I can use any matrices where most of the time I can just pick BT709. But when I want to experience a full color range video with HDR, I should choose BT2020 at 10-bit color depth (at least?), I see

Main points are:
a. stick with BT.2020 for HDR content
b. when your SDR content is > SD use BT.709 and make sure to properly to any color space conversions and adjust the vui flags accordingly to you changes
c. if your input content isn't properly flagged make sure you don't mess the conversion up
d. when doing HDR to SDR conversion, use a tone mapping filter and adjust the flags properly

Cu Selur