HLS specific stream descriptor fields

hls_name:Required for audio when outputting HLS. name of the output stream. This is not (necessarily) the same as output. This is used as the NAME attribute for EXT-X-MEDIA. hls_group_id:Required for audio when outputting HLS. The group ID for the output stream. This is used as the GROUP-ID attribute for EXT-X-MEDIA. playlist_name:Required for HLS output. Name of the playlist for the stream. Usually ends with ‘.m3u8’.