[Bug 682172] qtdemux: avoid reading parts of file not used (skip reading video data if only audio is active)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=682172

--- Comment #4 from Edward Hervey <bilboed at bilboed.com> ---
The problem is also having a system by which the demuxer can "reliably" know
that some streams are not needed by downstream.

The GST_EVENT_SELECT_STREAM *partially* solves this issue, but isn't enough to
know that unselected streams will *never* be needed.

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