+ImageContent::full_length (shared_ptr<const Film> film) const
+{
+ FrameRateChange const frc (film, shared_from_this());
+ return DCPTime::from_frames (llrint(video->length_after_3d_combine() * frc.factor()), film->video_frame_rate());
+}
+
+DCPTime
+ImageContent::approximate_length () const