Feature request: support for alternate renditions (alternate video, audio, ...)

[tmoehle]

Hey,

first of all thank you for this great plugin!
I have a feature Request: HLS supports master playlists with different video, audio and subtitle renditions for the same bitrate. That way you can supply - for example - different camera perspectives or localised / translated audio tracks in one playlist.

A technical documentation of this can be found in Apples recently published RFC: https://tools.ietf.org/html/rfc8216#section-4.3.4.1.1

Since you already support choosing different bitrates, I guess it might not be too difficult to also implement this feature.

What do you think about it?