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Discussion on Article:
Japanese Government to Launch 4K UHDTV Broadcasting in 2014.
The point of higher resolutions is to resolve more pixels.
Encoding at 4k is not a way of getting better encoding quality for a 1080p.
Encoding at 4k resoultion uses space to store details (subpixels) that cannot be displayed on a 1080p screen.
At any bitrate, encoding at 1080p will give better results on a 1080p screen.
What you are actually finding is that 1080p is a very good resolution, and the video you are used to seeing in 1080p has not fully exploited its resolution, whereas high quality demo samples show it at its best.
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