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Originally Posted by BrianO
Not true.
Neglecting differences in compression efficiencies between interlaced and progressive scan (progressive scan compresses more easily), 720p/60 uses approximately 11.8 perecent less bandwidth than 1080i. A 720p frame only contains approx. 4/9 the number of pixels in a 1080i/p frame.
Also, 720p does not have to broadcast at 60 frames per second. Under the ATSC spec, it can be broadcast at 30 frames per second or even 24 frames per second, but I have yet to see any broadcaster using the two lower frame rates.
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Doesn’t matter what the ATSC has deemed a format the only professional videotape playback of 720p is either 59.94Fps or 50Fps but the later one is for Europe.
There is more to the signal than just active pixels.