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Originally Posted by bob_builder
I noticed Sky1 doing this the other day during advert breaks. The program was being correctly transmitted as 16:9 widescreen but when the advert break started, the screen switched to 4:3 with black bars either side for the Sky1 advert but remained like this even for widescreen adverts (which were displayed with a black bar at the top and bottom as well as either side). When the program restarted, the screen switched back to 16:9, however.
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There has been a known issue which causes the STB to send the wrong aspect ratio command to your TV, which can result in you watching a 'zoomed' 4:3 letterbox picture rather than a true 16:9 picture. Once the error arises on your STB, it remains there until you reboot, or if you use Settings to set to 4:3 and then straight back to 16:9.
However what you're seeing on Sky One is, AFAIK, not an error with the STB but down to Sky deciding for whatever reason to continue to broadcast their ad-breaks in 4:3. Channel 5 often does this as well. You end up seeing a lot of ads as 4:3 letterbox because they are all recorded in 16:9 these days and many are not made available for broadcast in a 4:3 version.