[FFmpeg-user] -vf Colorspace filter - 'Unknown input primaries 2' error

[Kevin Wheatley]

For note DCP's are typically 2.6 gamma encoded X'Y'Z'.

Conversion to Rec 709 RGB might be as simple as linearise to XYZ and
then convert to 709 using the primaries matrix and apply an
appropriate transfer function for your new display environment,
however for perceptual matching you may need to adjust for the
creative white used to make the DCP using a modified von kries
chromatic adaptation - assuming you know the creative white point.

Kevin