-controls scale the subtitles. Scale values of 1 make the subtitles
-the same size (relative to the size of the image) as they are on the
-original. Values lower than 1 make them smaller, and values higher
-make them larger. You can stretch the subtitles in either direction
-by specifying different values for X and Y scale. Subtitles from DVD
-and Blu Ray sources are frequently larger (relative to the video
-frame) than those typically used for DCP, so it is often useful to
-scale such subtitles down using these controls.
+controls scale subtitles. These controls have no effect for closed
+captions. Scale values of 1 make the subtitles the same size
+(relative to the size of the image) as they are on the original.
+Values lower than 1 make them smaller, and values higher make them
+larger. You can stretch the subtitles in either direction by
+specifying different values for X and Y scale. Subtitles from DVD and
+Blu Ray sources are frequently larger (relative to the video frame)
+than those typically used for DCP, so it is often useful to scale such
+subtitles down using these controls.