=1080:flags=print_info+bicubic+full_chroma_inp+full_chroma_int' -sws_dither none The full console output is: ffmpeg -i 'input.MP4' -filter_complex 'extractplanes=y+u+v scale=w=3840:h=2160:flags=print_info+neighbor+bitexact scale=w=3840:h=2160:flags=print_info+neighbor+bitexact [y However, the image has a slight red tint compared to the original.

The result, VLC tells me, is a 1080p yuv444 video, and I can see excellent color resolution, so far so good. I am downscaling 4K YUV420 video from the Panasonic LX100 to Full HD YUV444 using the ffmpeg console in Windows, and a script provided by user karl on the Personal View forum, modified for outputting H265 video at constant rate factor 18: ffmpeg -i 'input_path.MP4' -filter_complex 'extractplanes=y+u+v scale=w=3840:h=2160:flags=print_info+neighbor+bitexact scale=w=3840:h=2160:flags=print_info+neighbor+bitexact mergeplanes=0x001020:yuv444p,format=pix_fmts=yuv444p10le,scale=w=1920:h=1080:flags=print_info+bicubic+full_chroma_inp+full_chroma_int' -sws_dither none -c:v libx265 -preset medium -crf 18 -c:a copy -c:s copy -c:d copy -map 0 'output_path.mp4'

Ffmpeg resize to 1080p