ffmpeg -i in.h265 -c:v hevc -bf 0 -profile main -s 3840x2160 -r 25 -pix_fmt yuv420p -b:v 20M out.h25

然后去掉SEI,AUD等

ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT

如果时windows,用双引号

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