std::list<ContentTimePeriod> image_subtitles_during (ContentTimePeriod, bool starting) const;
std::list<ContentTimePeriod> text_subtitles_during (ContentTimePeriod, bool starting) const;
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boost::shared_ptr<Log> _log;
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std::list<boost::shared_ptr<FilterGraph> > _filter_graphs;
boost::mutex _filter_graphs_mutex;