#Normalize audio
ffmpeg-normalize *.<format> -v -pr -c:a <audio codec> -ext <extension>
Examples:
#ffmpeg-normalize *.opus -v -pr -c:a libvorbis -ext  ogg
ffmpeg-normalize *.flac -v -pr -c:a flac -ext flac
#ffmpeg-normalize *.ogg -v -pr -ext wav
ffmpeg-normalize *.m4a -v -pr -c:a libopus -ext opus
ffmpeg-normalize *.opus -v -pr -c:a libopus -ext opus

#extract images from video
ffmpeg -i file.mpg -r 1/1 $filename%03d.jpg

#found in .bashrc
yta-best="youtube-dl --extract-audio --audio-format best "