I have 2 questions:
1) You indicate that some stations have chosen 704x480 16:9 format...why would they do that instead of 4:3 when many sets cannot stretch/zoom 16:9 ?
2) Since 4:3 letterboxed commercials get stuffed into HD 16:9 broadcasts, why can't the stations or the sets automatically zoom window boxed material...doesn't strike me as difficult to detect that black/grey pixels exist all around the outside.
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