Can you see the difference?

[hifreak]

Hi

I have made a 1:1 copy i think of Spiderman Pal I think the quality is extremely good, and I have tried to test the copy with my original on my widescreen television and it is impossible for me to see the difference. Can this be true or i am dreaming? What do you guys think is it really for real that the quality is so mega extremely good that you can´t see it is a copy? :cool:

[Noah]

Are you saying 1:1 as in no compression or as a full disc copy?

[E-Male]

it totally depends on what you copy and how you coyp it
of course it can look like the original

[Xuivo]

Even if DVD-Rb (alias CCE) is the best out there, if you shrink a movie, you will for sure loose some information, check the edge around object or place where in the movie there's not much movement.
If you go from 4.5 Gig to 4.37, of course you will probably not see the difference

[Tiamat]

Generally speaking an encode with CCE will be indistingishable on a TV from the original, that's the nature of a TV display. That said I can see problems with DVDShrink :D and I soppose someone could flame me because there are exceptions with really long movies where even CCE or QuEnc just run out of bites :)

[Noah]

Get some frame captures from the original and the re-encoded version and paste corresponding frames into Photoshop as separate layers. At this point, you can zoom in and flip between them very easily (by switching visibilty of the layers) to see the differences as you'd see them.

To bring this out even more, set the re-encoded layer to "difference," merge the layers and adjust contrast to +95-99. This obviously is a distortion of visible differences, but it shows you clearly what pixels have changed from the original, and by how much.

Originally posted by Tiamat
Generally speaking an encode with CCE will be indistingishable on a TV from the original, that's the nature of a TV display.
With a small, interlaced TV, I would generally agree with you, but with large progressive displays, there are often visible differences. Of course, macroblocking from transcoding is usually a lot more objectionable and more visible on a wider range of displays.

[Tiamat]

I don't doubt your right Noah as I have no experience with large progressive displays, but it's understandable that if there was a problem that it would show up there.

[jdobbs]

It is completely possible that you can make copies of movies that will show no distinguishable difference. You will find that there are many movies that are mastered with a bitrate that is much higher than what is needed. It provides two things: Makes it dual layered and therefore harder to copy, and satisfies the studio by ensuring they have the highest quality available.

But -- there are also the rare ones (like Saving Private Ryan, SPR) that barely have enough bitrate even to give a good image on the original disc. When you take bitrate away from those there is going to be a visible difference. That's where DDogg and company's filter suggestions come in handy. They can't make the movie look as good as the original -- but they can make it look better than the unfiltered alternative.

On the bright side, though... you can be sure that when using CCE you are getting the best picture possible for the given bitrate and it will look much better than any requantizing transcoder. They typically really fall on their face with a movie like SPR.

[hifreak]

OK thank you for your impressions. I also think that we all are quite agree that the quality is really good. Like some of you say that you can see the difference if you really go in details. I made the copy with 75% compression and if I can make a copy again like this I will be satisfied :cool: