std::list<std::pair<boost::shared_ptr<Image>, int64_t> > process (AVFrame * frame);
private:
+ /** true if this graph has no filters in, so it just copies stuff straight through */
+ bool _copy;
AVFilterContext* _buffer_src_context;
AVFilterContext* _buffer_sink_context;
dcp::Size _size; ///< size of the images that this chain can process