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I have noticed on NBC network shows in the evening (news, etc.) that immediately after the fade to black before local commercial breaks is about 10 frames of 4x3 -- at evidenced by a slight black level mismatch. Then, the station's programming comes in at whatever its setting is. So, somebody along the chain is using AFD...
What's also interesting is full-height 4x3 commercials within an HD show. Line 21 up top is clearly visible, with the caption data churning away, during the spot. Normally that would be buried in overscan.
Chip
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