1080p vs 720p comparison outside of resolution

OblivionLord

Limp Gawd
Joined
Apr 16, 2004
Messages
168
I'm not concerned about the visual difference from 720 to 1080 at a certain distance. My question is, if 1080p rips naturally have higher bitrates then wouldn't you see a quality difference just in that itself compared to the lower bitrates in 720 variants if both are done from the same group?

For instance...

A.Fistful.Of.Dollars.1964.1080p.BluRay.x264-CiNEFiLE
Video.......: x264 @ 10500 kbps

A.Fistful.Of.Dollars.1964.720p.BluRay.x264-CiNEFiLE
Video.......: x264 @ 5425 kbps
 

tuxista

Weaksauce
Joined
Aug 10, 2009
Messages
88
1080p has roughly twice the amount of pixels as 720p, therefore to keep the same compression level, twice the bitrate is needed (assuming same frame rate).

Therefore a 1080p 10500 kbps movie is compressed with approximately the same quality as a 720p 5425 kbps movie.
 

sphinx99

Gawd
Joined
Dec 23, 2006
Messages
962
Unfortunately that's not quite correct.

It will depend on the material. A scene with a great deal of high frequency detail (e.g. forest with trees and leaves all moving in the wind) will require a large amount of bandwidth and 720p will look better than 1080p assuming similar bitrate. On the other hand, a scene with fewer large objects may show smoother, sharper edges at 1080p on a 1080 display than upconverted 720p of the same bitrate.
 

Snowknight26

Supreme [H]ardness
Joined
May 8, 2005
Messages
4,415
A scene with a great deal of high frequency detail (e.g. forest with trees and leaves all moving in the wind) will require a large amount of bandwidth and 720p will look better than 1080p assuming similar bitrate.
That's not correct either. It's a toss-up.

On one hand, the higher resolution of the 1080p version will look closer to the (1080p) source than a 720p version of the same bitrate as data is lost when you resize down.
 
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