[Cin] "color hell"

[Andrew Randrianasulu]

According to

https://kdenlive.org/en/project/color-hell-ffmpeg-transcoding-and-preserving-bt-601/

bt 601 pal and bt 601 ntsc are  slightly different, I tried to update
CinGG's definitions so now she have two distinct 601 colorspaces, but I
still can be wrong (esp on kr, kb coeffecients)

can anyone test patch 3 and see if it makes any positive difference?
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