[Bug 775132] adaptivedemux: Download fragment only for activated stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775132

--- Comment #12 from Seungha Yang <sh.yang at lge.com> ---
Hello all
Originally, I was planning to expose only activated streams, but discussion for
it seems to be delayed I think.
More urgent issue is multi-track with multi-period (in dash) or bitrate switch
(in hls) issue with playbin3.

Obviously, exposed pads by hlsdemux can have identical caps.
Then, with bitrate switch, new pads are exposed. At this moment, how can we map
previously used streams with new streams?
For example, "bitrate A" has 2 streams, one is for video and the other is
audio.
Then, with bitrate switching to "bitrate B", a video stream in "bitrate B"
should be linked to the video stream of "bitrate A"

To allow above things, we should use of GstStream API both in adaptivedemux and
urisourcebin.

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