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list<Clip*> closing_clips; ///<List of clips that need to be closed
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map<Clip*, Clip*> open_clips; ///<List of 'opened' clips on this timeline
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list<EffectBase*> effects; ///<List of clips on this timeline
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/// Process a new layer of video or audio
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void add_layer(tr1::shared_ptr<Frame> new_frame, Clip* source_clip, long int clip_frame_number, long int timeline_frame_number, bool is_top_clip);