/** @return video frame rate (if known); must not be called if has_video() == false */
virtual boost::optional<double> video_frame_rate () const = 0;
- /** @return video size; must not be called if has_video() == false */
- virtual dcp::Size video_size () const = 0;
+ /** @return video size (if known) */
+ virtual boost::optional<dcp::Size> video_size() const = 0;
/** @return video length in frames; must not be called if has_video() == false */
virtual Frame video_length () const = 0;
/** @return video sample aspect ratio (if known); must not be called if has_video() == false */