* @param s Size of the images to process.
* @param p Pixel format of the images to process.
*/
-FilterGraph::FilterGraph (shared_ptr<Film> film, FFmpegDecoder* decoder, libdcp::Size s, AVPixelFormat p)
+FilterGraph::FilterGraph (shared_ptr<const Film> film, FFmpegDecoder* decoder, libdcp::Size s, AVPixelFormat p)
: _buffer_src_context (0)
, _buffer_sink_context (0)
, _size (s)