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Resize Video with FFmpeg

Change video resolution while preserving aspect ratio.

ffmpeg -i "input.mp4" -vf "scale=-2:720" -c:v libx264 -crf 23 -preset medium -c:a copy "720p.mp4"

Generate FFmpeg scale commands to change video resolution while preserving aspect ratio when needed.

Parameter breakdown

Sets height to 720px and calculates an even width automatically.

Re-encodes the resized video as H.264.

Sets a practical balance of quality and file size.

Keeps the original audio stream unchanged.

ffmpeg -i "input.mp4" -vf "scale=1280:-2" -c:v libx264 -crf 23 -preset medium -c:a copy "resized.mp4"

ffmpeg -i "input.mp4" -vf "scale=iw/2:ih/2" -c:v libx264 -crf 23 -preset medium -c:a copy "half-size.mp4"