[Bug 646638] [API] need stream (de)activation API

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=646638
  GStreamer | gstreamer (core) | unspecified

--- Comment #14 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-03-22 14:40:41 UTC ---
Something to keep in mind when designing/implementing this is that it should
still be possible to have multiple streams of a subtype active at the same
time, e.g to have audio descriptions for visually-impaired people mixed with a
normal audio track, even if playbin does not support that yet.

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