I would like Shaw cable to explain to me why my big screen tv's have large black bands on top and bottom of the screen during programs, but when the commercials come on it fills the screen, and no it's not the aspect ratio.
Which channel/s are you noticing this on? My guess is that this is an HD channel and that particular program is not on HD. If you press the info button you should see an HD icon in the top right corner of that screen.
Thought i would add this depends on how the show is filmed too.
You can setup your tv to stretch if you want BUT you run into most HD looking fine and SD looking horrible as....well you don't want to stretch SD as its ugly.
For instance you can go out and buy a movie on blu-ray that was made in widescreen. it will have the letterboxes on the top and bottom UNLESS your tv has a zoom feature but you will probably lose some picture on the side doing that.
So ya. Its probably HD to SD changing. Or a TV show that is in HD but the commercials are in a different format than what the HD show was filmed in.
Esham is right on the money here. What gets displayed on your TV will vary based on the settings on the TV, DCT and the format in which the video was filmed. In a sense, it is all about the aspect ratio.
Here's a little more information on Letterboxes:
16:9 commercials, but the movie being showing as 21:9 would cause this, is my first thought
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