c - How to decode mp3 to pcm by ffmpeg - Stack Overflow
Free MP4 to MP3 Converter - Convert MP4, M4A, M4B, AAC files to MP3
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
Operations on Audio/Video files using ffmpeg, avconv, and youtube-dl - GeeksforGeeks
AAC to MP3 Android: How to Convert AAC to MP3 on Android
Audio Transcoding using FFmpeg - Change Audio Codecs using FFmpeg Easily - OTTVerse