Crop Video from 16:9 to 4:3 FFmpeg:
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ffmpeg -i "input.mp4" -filter:v "crop=ih/3*4:ih" Output.mkv
*This will crop the video to 4:3 at the centre of a 16:9 video. Including passing on the audio.

Source: https://www.linuxuprising.com/2020/01/ffmpeg-how-to-crop-videos-with-examples.html
Date: April 10th 2024