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qtdemux_update_streams() is only ever called after checking `qtdemux->streams_aware` is TRUE. There is no need to check for that condition again. `qtdemux->streams_aware` is only modified when the demuxer is hard-resetted, which is mutually exclusive with demuxing, so it cannot be modified during the call. https://bugzilla.gnome.org/show_bug.cgi?id=797191
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