AFD Status Fix

Program Segment	AIM000845S
AFD	HD 16x9
AFDStart	2021-05-04 11:02:06.0
AFDFinish	2021-05-04 11:02:06.0
MXFAvailable	2021-05-04 11:58:03.0

Unknown means assumed SD-MXF 4x2

SD-MXF 4x3 means SD full-screen, HD pillar-box

SD-MXF 4x2 means SD letter-box, HD full-screen

HD-MXF 16x9 means SD letter-box, HD full-screen

HD-MXF 4x3 means SD full-screen, HD pillar-box

How to recongize and fix an AFD error.

Change to: If the picture is postage-stamp, change to: