std::list<boost::shared_ptr<VideoFilterGraph> > _filter_graphs;
boost::mutex _filter_graphs_mutex;
ContentTime _pts_offset;
boost::optional<ContentTime> _current_subtitle_to;
std::list<boost::shared_ptr<VideoFilterGraph> > _filter_graphs;
boost::mutex _filter_graphs_mutex;
ContentTime _pts_offset;
boost::optional<ContentTime> _current_subtitle_to;