Active Format Description (AFD) & Bar Data Recommended Practice
Sometimes the picture on a TV only fills part of the screen. The empty screen space is usually on the top and bottom or left and right. Occasionally it’s in both places. It’s there because at some point between creation of the video image and its display on the TV the image aspect ratio didn’t match the image aspect ratio used by at least one piece of equipment. For example, imagine a 1980s TV program broadcast over a modern widescreen TV station. The TV station’s widescreen equipment might leave blank spaces on either side of the narrow 1980s video. And if the TV station’s widescreen signal is received by a set-top box that then converts it to standard definition for display on an old-style TV, the set-top box might leave blank spaces on the top and bottom of the screen so the entire width of the widescreen image can be viewed on the old-style TV. CTA-CEB16-B makes recommendations to device makers on how devices can communicate information about the size of the video being used and optimize the viewer experience.
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