FFmpeg notes (including FFmpeg install): https://www.rickmakes.com/ffmpeg-notes/
FFmpeg playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZOPDZ71Khzt5PX4X4j6flkg
FFmpeg Color Notes:
https://ffmpeg.org/ffmpeg-utils.html#Color
View Video Settings
ffprobe train_whistle.mp4
Add Solid Color Background to Audio File
ffmpeg -i train_whistle_audio.m4a -f lavfi -i color=c=blue:s=640x480:r=15 -acodec copy -shortest train_whistle_blue_background.mp4