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Old 18 Sep 2006, 03:27 AM   #1
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Question Shrink vs. DVD Rebuilder

I've ripped my copy of the Incredibles. I reauthored it, and compiled the stuff I like from the two disks using Shrink. Then I saved it, uncompressed, to files.

Applying DVDShrink to make a single layer DVD, the compression is around 57%. (The files are shrunk to 43% of the original files.) I made an ISO with that compression. THE_INCREDIBLES.ISO

Last night I ran DVD Rebuilder on the same files, then took the result into DVDShrink, stripped the French audio off (because I don't like burning my disks to the edge and I didn't want to introduce any additional compression) and made a new ISO with the result. THE_INCREDIBLES_REBUILT.ISO

I have genuine Taiyo Yuden DVD+R YUDEN000T02 8x media which consistently gives me disk quality results of 95 when I run a Nero CD-DVD Speed scan on it. I burn with a Sony DVD RW DW-D22A BFS1.

What I would like to do now is burn each ISO to a disk, and then compare the quality of the two disks.

How can I test them? Assuming the shrink disk has no gross errors (pixelation, freezing) how can I show the improvement from re-encoding instead of transcoding?
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Old 18 Sep 2006, 03:55 AM   #2
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no program will do an efficient job of shrinking 10 gigs down to 4.3 gigs in dvd
format, sure you have that right?

rebuilder will do a slightly better job at 57 and is easily verified on a computer monitor
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Old 18 Sep 2006, 04:03 AM   #3
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I was surprised that it didn't hit the red shrinking to 43% too. Both files are ready to burn, though.

You say it is easily verified on a computer monitor. Would you expand on that?
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Old 18 Sep 2006, 10:28 AM   #4
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Just watch them. Quite frankly, with a source like The Incredibles, I would have shrunk to a single disk using DVD Rebuilder.

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Old 19 Sep 2006, 06:01 PM   #5
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Well, I can't tell the copies apart. Admittedly, I am not watching them on high def, but the shrink is playing as well as the rebuilder copy. I'm quite certain that there is an advantage to using Rebuilder; I just wanted to prove it.

I imagine it is more about the bitrate than the compression. Unfortunately, I can't figure out the bitrate calculators. (gack, what a terrible admission that is.)
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Old 19 Sep 2006, 06:59 PM   #6
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See Compression Explained in my signature.

Also, you need to understand quantisation. Low quant sources are more easily compressed and can look very good at even high compression rates. However, if the source is difficult (and a cartoon is NOT) and is already high quant, the more you compress it, the worse the artifacts.

Look at some of the comparisons by UncasMS in this sub-forum.

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