Creating HLS rendition groups
The key to creating rendition groups is that each output you create must contain only one stream. Therefore, for each video to include in the output group, you create a stream assembly that contains only one video (no audio or captions). For each audio to include in a rendition group, you create a stream assembly that contains only one audio (no video or captions).
This means that when rendition groups are present in the HLS output group, an output is identical to a stream. (Usually an output contains a mix of several streams and several stream types.)