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Fix playback of representations containing both audio and video tracks

Vinay Rosenberg requested to merge github/fork/mstorsjo/mediatype-video-muxed into development

Created by: mstorsjo

This fixes playback of muxed representations, where there are ContentComponent elements for both audio and video. In these cases, the initializeMediaSource method in Stream first initializes a stream of type "video" containing both audio and video, and the "audio" media type isn't initialized (with a log message "No buffer was created, skipping audio data.").

Therefore, primarily set the media type to "video", if the adaptation set contains a video track.

This fixes playback of http://albin.abo.fi/~mstorsjo/dash/ondemand-combined.mpd (which worked fine in the 1.2.0 release).

A feedback agreement has been posted at https://groups.google.com/d/msg/dashjs/GW2oc8wTG8E/cC6osFFZrDoJ.

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