VideoFrame dcp_to_content_video (boost::shared_ptr<const Piece> piece, DCPTime t) const;
AudioFrame dcp_to_content_audio (boost::shared_ptr<const Piece> piece, DCPTime t) const;
ContentTime dcp_to_content_subtitle (boost::shared_ptr<const Piece> piece, DCPTime t) const;
+ boost::shared_ptr<DCPVideo> black_dcp_video (DCPTime) const;
template<class C>
std::list<boost::shared_ptr<Piece> >