'Same bitrate but different resolutions when using ffmpeg
I am encoding a video with the same bitrate (so it will result in the same file size), but under different resolutions (say 540p, 630p, and 720p). What does ffmpeg change that would make the file size remain the same?
ffmpeg -i original.mp4 -vf "scale=720:-1" -b:v 2M output.mp4
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