mpv-player/mpv — pull request #1401 by haasn (2014-12-29 13:51:29+00:00)
Title: vo_opengl: Ignore approx-gamma for BT.2020-CL

The details of the non-linear transformation from/to BT.2020's constant
luminance system don't really make sense with any other gamma curve,
since changing the gamma curve completely breaks the chroma channels.