Hi Serdal, please correct me if I’m misunderstood. You have streams that have multiple audio & subtitles right ?
Lots of player ( jw & bitmovin player, maybe wowza player also ) support selecting audio channels but first you need to implement this module
then you need to pass audioindex parameter, actually
it is for vod however live stream might work.
For multiple subtitle wowza has closed caption support you can also use wowzacaptionlanguages query string for request, but I generally use & suggest handling subtitle on player side.
If you want to detect which audio index represent which language, then you have to develop wowza module or you can look the audio map ( channels ) with ffmpeg, for more info maybe hiring consultant work for you In addition you can check this post also https://www.wowza.com/docs/how-to-specify-per-stream-settings-in-stream-files