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I was wondering whether there is any visible difference between Region 1 and Region 2 movies. Region 1 is encoded in 23.976 fps standard, right? And Region 2 is 25 fps.

But as I assume the movies are shot in 23.976 only, the R2 releases are just some convert/recode to be compatible with the region.

Which ultimately leads me to a question: If presented with a movie playing from R1 and R2 discs simultaneously, can a trained eye see any difference?

I know for a fact an eye can see the difference between 23.976 fps and 25 fps. A lot of low-budget movies/web series are being released lately since the Canon dSLRs can record video and there definitely is a visible difference between the standard 24 film fps and the "fluid, unnatural" 25 fps.

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You seem to have asked several questions here. Is there a visible difference between DVDs for variuos regions? and Does region coding imply frame rate? Along with some commentary about frame rates. You would probably do well to turn this into two or three separate questions. –  Flimzy Oct 15 '11 at 19:37
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There is no visible difference, unless the DVD/BR publisher labels their discs as such. Any region code (or even region-free data) can be burned or pressed on to any media.

Furthermore, region encoding (at least on DVDs, and I assume on BRs) has nothing (technically) to do with the video format. Now, you're likely to find Region-1 DVDs in NTSC format, Region 1 is the U.S. and Canada, and the U.S. and Canada use NTSC, but there's no technical barrier to creating a R1 DVD in PAL format.

See the Wikipedia article on DVD Region codes, and specifically the section on NTSC vs. PAL.

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You can only see the difference in compression of those 2 dvds, as for FPS, untrained eyes wont see the difference in 1 fps. trained eyes do.

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Compression and FPS have nothing to do with region encoding. At all. –  Flimzy Feb 20 '12 at 8:10
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