I am sorry, what? It converts to 420 always? Wow? But you are right. This
is a problem that colors are wrong after YUV444 - > YUV420 -> RGB. It
selects BT.709 matrix even if BT.601 matrix is requested, this can be fixed
by "ffplay -vf scale=in_color_matrix=auto,format=gbrp" or just by using
mpv. Maybe I need to further test VUI vs -movflags +write_colr vs what my
samples use.
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