+ /* Default video frame rate to 24fps if the examiner doesn't know */
+ _video_frame_rate = vfr.get_value_or (24);
+ _video_length = vl;
+ _sample_aspect_ratio = ar;
+
+ /* Guess correct scale from size and sample aspect ratio */
+ _scale = VideoContentScale (
+ Ratio::nearest_from_ratio (float (_video_size.width) * ar.get_value_or (1) / _video_size.height)
+ );