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Active Format Descriptor
In television technology, Active Format Descriptor or Active Format Description (AFD) is a signal that broadcasters can transmit with the picture to enable both 4:3 and 16:9 television sets to optimally present pictures transmitted in either format. Essentially, AFD is a standard set of codes sent in the MPEG video stream that provides aspect ratio and safe area information to television or set-top-box decoders.
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