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colorspace: default HDR to true black

Niklas Haas requested to merge true_black into master

With the rise of OLED displays, this choice was revealed to be an error. A number of considerations motivate this change:

  • Even affordable HDR displays are now better than 0.005 nits.
  • All low-contrast HDR monitors can raise the black point to avoid clipping, but I don't know if OLED monitors can lower the black point of incoming signals, even with metadata.
  • Metadata passthrough is still not reliable enough, even in 2022.

Defaulting to true black is a significantly safer scenario overall.

Closes: #222 (closed) Fixes: https://github.com/mpv-player/mpv/issues/10113 See-Also: https://github.com/mpv-player/mpv/issues/10558

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