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Old 5th August 2019, 00:52   #1  |  Link
Prizm
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How to tell if DVDShrink was used on a copied DVD?

I have a couple old independent movies on burnt DVDs that I'm converting. I'm pretty sure I copied them myself from the originals years ago.

The source footage has some blocky artifacts and now I'm suspecting I may have used DVDShrink to reduce the films from dual-layer to single layer. Although the original film source is really grainy anyway, so it may just be a result of that.

Is there any way to tell?

If the original was dual layer, I might have to try and find it for sale again to get a better archive version. The DVD cover images don't indicate 'dual-layer' either. The films are only about 1h15min each so it does seem unlikely.

Thanks
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Old 5th August 2019, 01:10   #2  |  Link
StainlessS
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Not sure if you can tell, myself I set options to 9.whatever (dual layer disk output), so is never compressed (only ever do folder image).
If you buy a naff 2-in-one, (two titles on single DVD) then its gonna be naff(on occasion not naff, eg dual side - then obviously not DVD-Shrink, dual side, not a burned disk).
The only real way to tell is if you can do a MediaInfo pass on it, and if it says summick like "created by DVD-Shrink", BUT, I would be guessin' it aint gonna do that.

EDIT: I dont think you can tell, could be wrong of course. [try it yourself, anything in MediaInfo ?]

EDIT: You could also try doing DVD-shrink disk, & in MediaInfo, see if compressor stuff differs from original.
[do multiple extracts, & MediaInfo of same, and look for DIFFERENCES, and make what you will of those].
Patience and common sense your only hope, methinks.
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Last edited by StainlessS; 5th August 2019 at 02:18.
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Old 5th August 2019, 11:43   #3  |  Link
Prizm
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Yeah, I figured those are about the only options. Nothing stood out when I had a quick look in MediaInfo, but I'll check it again. Thanks
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Old 7th August 2019, 11:00   #4  |  Link
Emulgator
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I remember to have read about DVDShrink shortening DCT coefficients,
so one may do a test run of DVD Shrink and compare the DCT tables / quantizer matrices
that DVD Shrink typically leaves vs the original.
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Old 12th August 2019, 13:13   #5  |  Link
Ghitulescu
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Quote:
Originally Posted by Prizm View Post
I have a couple old independent movies on burnt DVDs that I'm converting.

The source footage has some blocky artifacts and now I'm suspecting I may have used DVDShrink to reduce the films from dual-layer to single layer.
The question appears to have been answered by itself.

People having the habit of converting they did it all the times.
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