id - encoding: Set by user. - decoding: Set by libavcodec.
position of the top left corner in 1/16 pel for up to 3 fields/frames - encoding: Set by user. - decoding: Set by libavcodec.
width and height in 1/16 pel - encoding: Set by user. - decoding: Set by libavcodec.
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Pan Scan area. This specifies the area which should be displayed. Note there may be multiple such areas for one frame.