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playbin3 currently implements the same URI properties as playbin:

• uri: URI of the media to play
• suburi: Optional URI of a subtitle
• current-uri: The currently playing URI
• current-suburi: The currently playing URI of a subtitle

suburi can actually be used to play audio or video, at least with playbin, see #690 (closed), no the naming isn't great.

Also, one may want to play 3 streams together (audio, video, text) which is currently not possible. Or even be able to quickly switch between different streams of the same type.

I was thinking we could implement something more flexible and generic using the new stream APIs:

• add a new uris property taking an array of URIs
• expose them all using GstStreamCollection
• activate by default the first audio/video/text streams
• let user activate specific streams using GST_EVENT_SELECT_STREAMS
• add a new current-uris property containing the subset of uris currently activated.

@bilboed : any thoughts?