FFmpeg How to extract Audio in mp3 aac flac wav format from a Video File - 2019 - YouTube
ffmpeg audio format conversions - Linux Tutorials - Learn Linux Configuration
3 Finest AAC Audio Compressors You Can Use on Web & Desktop
Audacity tutorial: Converting to mp3 or AAC and other formats, example: Matthew Smith - epic orchestral synth music for film and game effects; Buanzo's LAME mp3 library