KBPS

[Belfour]

Hi folks,

As a beginner, I have a few questions regarding kbps.

A few days back, I encoded/transformed 2 avi files to DVD files, with CCE, 6 passes. I then checked one of the vob files in gspot and found out that the kbps were 4775 kbps. I then checked a vob, from a real DVD movie, and that vob file contained 4315 kbps. Does that mean that my two transferred avi files have a better resolution than the real vob files from the DVD?

To me is feels unlikely, but hey, like I said: I’m a beginner.

Johansson

[mats.hogberg]

It only means your encode used a higher bitrate than the "real" DVD movie. Nothing else.
Resolution is mostly the same for DVD; 720x576 (PAL)
Using 6 pass encodes is just a waste of time. I dare you to see any difference between a 2 pass and a 6 pass.
What kind of source AVI are we talking about? If it's the average DivX/XviD movie at around 1 GB, most picture quality has been squeezed out of it already anyway, and to spend time on reproducing this lack of quality as exact as possible is pointless.

If you have a very high quality source file, you can possibly gain something with > 2 passes.

/Mats

[Belfour]

It only means your encode used a higher bitrate than the "real" DVD movie. Nothing else.
Resolution is mostly the same for DVD; 720x576 (PAL)
Using 6 pass encodes is just a waste of time. I dare you to see any difference between a 2 pass and a 6 pass.
What kind of source AVI are we talking about? If it's the average DivX/XviD movie at around 1 GB, most picture quality has been squeezed out of it already anyway, and to spend time on reproducing this lack of quality as exact as possible is pointless.

If you have a very high quality source file, you can possibly gain something with > 2 passes.

/Mats

Well, the files are 1.4 GB if one gathers them, and the files have AC3 sound (448 kbps)

I didn’t have a clue that you get the same result with 2 passes than 6 passes. 6 passes was switched on from the beginning in the program. Thanks for clearing that out, because as you say, it’s a waste of time.

I don’t usually convert avi to DVD, as the image is pretty bad comparing with a real DVD.

Johansson

[jman98]

I would say that 3 passes is OK and is the general way that CCE is used. However, I have seen video that used a lot more than 6 passes, but it was really low bit rate stuff. I'm talking bit rates below 2000 Kpbs VBR here. Some people say you can stop at 2 passes. I remember seeing some research done many years ago on this subject and generally that wasn't much gain on the 3rd pass, but if you have time to do it, there's nothing wrong with doing 3 or more passes. It's just whatever you have time for.

We don't have any specs on your AVI source, but probably it used a fairly low bit rate. Try playing it and then expand the image to full screen and you'll see the defects in the source. All you can do when encoding an AVI to DVD is to hope to be relatively close to the original, but if the original has flaws, your encode will too.

[KBeee]

And remember, if you want to watch those files on your TV, it's still better (and cheaper) to buy a DVD player that also plays MPEG4/DivX/Xvid than re-encoding them!