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ffmpegHow to upscale video to 4k


ffmpeg -i in.mp4 -vf scale=-1:2160:flags=lanczos -c:v libx264 -crf 21 out.mp4ctrl + c
-i in.mp4

input video file

-vf

apply specific video filters

scale=

scale video

-1

width will be automatically calculated based on aspect ratio

2160

set scaling height to 2160 pixels (4k resolution)

flags=lanczos

use lanczos scaling algorithm

-c:v libx264

use H.264 codec

-crf 21

use good quality for encoding

out.mp4

resulting video file