FFmpeg notes (including FFmpeg install): https://www.rickmakes.com/ffmpeg-notes/
FFmpeg playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZOPDZ71Khzt5PX4X4j6flkg
View Video Settings
ffprobe train_whistle.mp4
Extract Audio/Remove Video
ffmpeg -i train_whistle.mp4 -vn -acodec copy train_whistle_audio.m4a