Multi-Video/Audio track in MPEGDASH

[Seungha Yang]

Hello all

I'm working on Gstreamer based MPEGDASH, and found out a questionable 
behavior of AdaptiveDemux.

The thing is that, AdaptiveDemux (dashdemux) exposes all video/audio 
track and downloads them even though some of them do not used for 
presentation. Some usecases might want to download the all tracks but 
the other cases such as limited bandwidth may not.

One of expectable problem if we expose only one track per video/audio is 
that seamless track switch may not be easy, and there should be another 
AdaptiveDemux specific way to indicate available tracks to 
decodebin/playbin, since deactivated tracks will not be forwarded.

Were there any discussion on this topic?