This will upscale input.mp4 to be 4k resolution. If you know the desired resolution, simply setting the specific width and height for scaling with the scale flag: ffmpeg -i input.mp4 -vf scale=3840:2560 output4k.mp4 There is no flag or parameter to do either upscaling or downscaling rather this is determined by the values set for the scale flag. Or an advanced scale with flags and encoding: ffmpeg -i input.mp4 -vf scale=2560x1440:flags=lanczos -c:v libx264 -preset slow -crf 20 output_compress_1440p.mp4 The basis of scaling a video with FFmpeg uses the scale flag after the filtergraph ( -vf), then you can either do basic video scaling such as upscaling the video to twice the original resolution: ffmpeg -i input.mp4 -vf scale=iw*2:ih*2 output.mp4 Scaling a video means to make it either larger (higher resolution) or smaller (smaller resolution).
How to do video scaling using FFmpeg with examples for different types of upscaling and downscaling methods.
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