https://tools.ietf.org/html/draft-pantos-http-live-streaming-23 https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40008332-CH1-SW1
convert any audio to ADTS AAC audio:
ffmpeg \
-i 01-fiery-crash.mp3 \
-vn -ac 2 -acodec aac \
01-fiery-crash.aac