https://aws.amazon.com/solutions/implementations/video-on-demand-on-aws/
Audio on demean并没有具体教程，不过mediaConvert也可以覆盖。可以根据这个操作
https://docs.aws.amazon.com/mediaconvert/latest/ug/setting-up-audio-only.html
1. Input, remove the video selector
2. Add output groups, choose APPLE HLS
3. in the encoding setting in the output setting, remove video
4. in the Apple HLS, choose Container for Audio-only output, choose MPEG-2 Transport Stream (关键步骤）
