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Why does 1920x1080 look like 1440x1080?

Discussions about High Definition Television, Blu-Ray, HD DVD and other high definition DVD formats.

Why does 1920x1080 look like 1440x1080?

Postby Ron Hunter » Sat Oct 05, 2013 10:29 pm

While testing my new Canon HF R400 camcorder I learned the following about its four AVCHD recording modes:
- 60p = 60fps 1920x1080 28Mbps
- MXP = 30fps 1920x1080 24Mbps
- FXP = 30fps 1920x1080 15Mbps
- LP = 30fps 1440x1080 5Mbps

I shot footage of a bookcase in all four modes, combined the clips in PRE10 and exported the timeline as 1920x1080 M2T (30i) and MP4 files (30p). Since AVCHD LP mode is 1440x1080 I expected to see less material on the left and right screen edges as compared to the 1920x1080 modes. However, all four modes displayed the same screen size.

Even when I view each individual clip with Windows Media Player, all four clips seem to display the same amount of the bookcase. Can someone help me understand what is going on?
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Cameras (in use): Panasonic GH4/Canon HFR400/Canon HV30, GoPro HD Hero2.
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Re: Why does 1920x1080 look like 1440x1080?

Postby Chris B » Sun Oct 06, 2013 12:53 am

Not all pixels are created equally. When shooting 1440x1080 the pixels are rectangular (slightly wider than they are tall) so the final picture is the same size. It's a trick long used to save bandwidth (that LP is a very low 5 megabits per second). Pixels at 1920x1080 are square.
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