As title says, I need to downscale 4K video to FHD retaining as much quality as possible, what command should I use to achieve this?
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Why don't you just use one of the x264/x265 GUI's and use one of their presets?
ffmpeg -i input.mp4 -vf scale=w=1920:h=1080 -c:v libx264 -x264opts qp=0 -c:a copy output.mp4