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See http://lists.w3.org/Archives/Public/public-media-capture/2013Apr/0127.html and subsequent thread http://lists.w3.org/Archives/Public/public-media-capture/2013May/0173.html The origins of such constructed streams will need to be defined
Based on list discussion, there doesn't seem to be a benefit to this change that justifies the effort of doing the change (or the effort of updating implementations to match). Closing this item as WONTFIX.