use full range by default for yuv420p if supported #6655
Merged
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#6518
After the change, all colors in the image below are accurate for VP9 420 and AV1 420, but still inaccurate when r,g,b are not equal.
The conversion between yuv and rgb is irreversible, so there will be a loss of accuracy.
Teamviewer and parsec are inaccurate in both cases, anydesk accurate in both cases.
tested all codecs, 1.2.4->1.2.3, 1.2.3->1.2.4 on windows.