I had a whole folder of videos I wanted to convert to 720p, asked chatGPT and it gave me this:

find . -maxdepth 1 -type f -name "" -exec sh -c 'pv "$1" | ffmpeg -i pipe:0 -filter:v scale=720:-2 -c:a copy "${1%.}.mp4" 2> /dev/null' _ {} \;

Not sure if it can be improved but it works well