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Header data must be forwarded to downstream, but if demux does not finish to finding type (e.g., ts, mp4 and etc), this header data can be cleared by _stream_clear_pending_data(). Moreover, although demux finish downloading header data, still it has fragment date to be downloaded, fragment sequence shouldn't be advanced yet at that moment. https://bugzilla.gnome.org/show_bug.cgi?id=776928
b45dd51f