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Is there any quailty loss when you copy DVD to DVD
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krool
Newbie
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13. January 2004 @ 06:32 |
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Hi,
I was wondering when you copy a DVD to another DVD is there any loss in quality like when you copy VHS to VHS. There shouldn't be any because DVD is digital? Please advise?
Krool
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Staff Member
2 product reviews
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13. January 2004 @ 06:48 |
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It depends on the DVD and what method you use to back it up. If the original DVD is single layer (DVD-5) you can make an exact copy of the disc, meaning that there won't be any quality loss. If the disc is dual layer (DVD-9), which most of them are now, you can't make a copy of the entire disc that will fit on a DVD+/-R without reducing the quality. You can often fit the movie by itself on a blank, but you may still have to either reduce the quality or split the movie to 2 discs. You can also strip out audio and subtitle streams that you don't need.
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keithyb
Member
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15. January 2004 @ 18:39 |
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I use DVDShrink and just re-author it with just the movie. MOst movies are only 10-30% compressed this way. Lord of the rings movies are still 46% compressed with just the movie. That is the only movie I have seen that compressed. I have not noticed any quality degrade with just the movie. Who wants all the extra Crap anyway! :) And if You do, just burn another disk with the extra crap on it.
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NomadLand
Newbie
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16. January 2004 @ 09:43 |
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DVD X-Copy Express can now copy a dual layer DVD to a DVD-R using a compression method that does not reduce the quality. It is kinda pricey... but works wonderfully.
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drchips
Senior Member
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16. January 2004 @ 10:45 |
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NomadLand,Quote:
DVD X-Copy Express can now copy a dual layer DVD to a DVD-R using a compression method that does not reduce the quality
WRONG!
NOT POSSIBLE at this time and at the CURRENT level of technology.....
Think before you make such wild claims, there may be people reading this who might believe them, go and buy the product, then be a tad unhappy...
If you read a lot of the posts on this forum, you will come to the conclusion that THOSE WHO KNOW would never recommend that software.
Oh, and welcome to our happy little band, like most groups, little disagreements pop up now and then, but we don't let them bother us.
Have Fun...
Life is just more of the same:
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NomadLand
Newbie
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16. January 2004 @ 11:01 |
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Yes it is possible. I have the program and use it back up my DVD's. The old version of DVD x-copy required to split the movie onto 2 dvd-r's. But now with dvd x-copy express it will compress the movie to fit the entire dvd onto one dvd-r. It's true.... and it is available now. And there is no quality loss at all. You better check before you say it is impossible.
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keithyb
Member
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16. January 2004 @ 11:23 |
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drchips is right...its not possible... it has to compress it to fit it..and quality will be loss..
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drchips
Senior Member
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16. January 2004 @ 11:39 |
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No, I don't have to check first...
A simple understanding of the facts will suffice:
There are HARD CODED LIMITS in DVD Quality playback.
Any "magic" compression that will compress data by approx 50% WITHOUT DATA LOSS, will be INCOMPATIBLE with the HARDWARE CODECS in DVD Player chipsets.
Your claim that there is NO QUALITY LOSS is without grounds.
If YOU can not PERCEIVE any quality loss, it may be due to one or more of the following factors:
Lack of fidelity in the playback equipment.
Poor eyesight.
Poor standards of comparison.
I can conceive of a compression algorithm that will compress DVD-VIDEO by 50% with LITTLE quality loss, but it would only be playable on the PC with the correct (custom) codec installed, and as such, WOULD NOT BE DVD-COMPLIANT, and not playable on a standard player.
As I try to explain to the I.T. engineers I have to train every now and then, when a whole body of experience built over a period of time conflicts with ONE PERSON's experience, that ONE experience is suspect, until the STANDARDS CHANGE.
Let's see how many other EXPERIENCED members you can convince.
Byeeee...
Life is just more of the same:
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NomadLand
Newbie
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16. January 2004 @ 11:51 |
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Well.... whatever man.. I guess we could argue it till the sun sets and never agree... however, I know it works. I have many back-ups of dvd's that were more than 7 gigs compressed onto one 4.7 gig dvd-r and they play just fine on my stand alone dvd player. No...my level of perception is not less than any other individual.. it really works.
I guess the standards have changed and you just haven't caught up to them yet.
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drchips
Senior Member
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16. January 2004 @ 12:09 |
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Hahaha.....
Kewl..
Yeah, they will play just fine, but there WILL be quality loss...
If you are happy with what the program gives you, then I am cool with that.
Have Fun...
Life is just more of the same:
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keithyb
Member
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16. January 2004 @ 13:41 |
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DRchips, DO NOT ARGUE with the new comers! THEY KNOW IT ALL! Im sure they have far more experience then you...lol*cough*
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drchips
Senior Member
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16. January 2004 @ 13:52 |
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Thanks keith,
Aaaahh, sanity slowly returns to me..
I must remember, there is no spoon..
Om mane padme hom! Om mane padme hom....
Life is just more of the same:
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madrabbit
Newbie
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16. January 2004 @ 14:05 |
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It is impossible to compress (re-encode) a DVD (mpeg file) without any loss in quality.
321 Studios makes no such claim to the contrary.
/\/\
\/\/
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DogBomb
Senior Member
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17. January 2004 @ 01:31 |
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Is there an argument about quality loss with compressing a dual-layer DVD (9+GB) to a single layer DVD with 4.7GB? Of course there is! Is it perceivable? Probably, depending on whether it used all 9+ GBs and what is cut out with something like DVD2One or DVD Shrink. Some people will swear that a 192kps MP3 rip is just as good as the original CD, but of course, there definitely is quality loss.
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beasty976
Suspended due to non-functional email address
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17. January 2004 @ 12:17 |
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that nomaland is rite it is good and it work like he say no qality lost atall. the rest of you wrong an drchips wrong cuz my rips work like it says
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magic7
Newbie
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17. January 2004 @ 14:54 |
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i to have compressed 7+ discs to 4.7 and they have been very good but to say there is no quality loss is silly .the quality loss might be very minemal but at certain times on a disc you will notice them.
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AfterDawn Addict
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17. January 2004 @ 16:22 |
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I can compress 7.8 gig into 4.7gig, you can see a difference at such a high rate of compression. Usually though, you only have to compress say 6.5-7gig with most films, at this rate the picture quality is ,I think, very good. People can argue the toss about compatibilty with dvd players, both my pioneer & my toshiba players have no compatibilty issues with any of the media & compression technology I use. My system will read 7.8gig in 50mins & burn that in 25mins. I use a sony dru510a with a gig of RAM & a 2.6 Athlon clocked to 2.1gig. I have founed that packard bell +R &-R work really well with dvdx platinum. My success rate is very good & I have very few coasters to prove it!
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AfterDawn Addict
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17. January 2004 @ 16:37 |
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Having said all of that though, (even with found spelt incorrectly!) Drchips seems to know everything about it though. Thank God for smart arses! Just 'cos you may teach IT engineers does not constitute absolute knowledge in that subject. There are a hell of a lot of clever people out there. You shouldn't underestimate peoples' knowledge & you shouldn't overestimate your own.
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drchips
Senior Member
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17. January 2004 @ 18:25 |
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Hahaha,
pulsar:
so nicely put, I do appreciate the effort you have made with your grammar and spelling.
I hope you didn't hurt your chin.
Anyway, in response to your post:Quote:
(even with found spelt incorrectly!)
you are right to correct my spelling, but you have the advantage of me, for I am at somewhat of a loss as to WHERE in this thread I made THAT mistake, please provide a quote. *START OF EDITED TEXT* I have found (sic) the mis-spelt "found" in pulsar's own post, so I was in error in assuming he was referring to a mistake I made, my apologies, no quote required *END OF EDITED TEXT*.Quote:
Drchips seems to know everything about it though.
Good Lord! I should be MOST interested if you would quote from my posts in this thread that which gives you just cause to make such a scurrilous statement.Quote:
Thank God for smart arses!
Ah yes, personal insult, always a good fall-back position.Quote:
Just 'cos you may teach IT engineers does not constitute absolute knowledge in that subject.
True, true. Where did I make any claim to such "absolute knowledge"? A quote, if you please.Quote:
You shouldn't underestimate peoples' knowledge & you shouldn't overestimate your own.
Good advice indeed!. Could it just be possible that you are, in fact, underestimating MY KNOWLEDGE in this regard? Hoist by ones own Petard, perhaps!
BTW, that comes from Shakespeare's Hamlet:
'For tis the sport to have the enginer
Hoist with his owne petar'.
Rather good quote; fitting, I thought.
Now, a quick precis of what has gone before.
NomadLand claimed:Quote:
DVD X-Copy Express can now copy a dual layer DVD to a DVD-R using a compression method that does not reduce the quality.
I refuted that claim.Quote:
NOT POSSIBLE at this time and at the CURRENT level of technology.....
NomadLand re-iterated his claim.Quote:
Yes it is possible. I have the program and use it back up my DVD's.
I proceeded to provide reasoned points in support of my refutation.
In a post by madrabbit:Quote:
It is impossible to compress (re-encode) a DVD (mpeg file) without any loss in quality.
321 Studios makes no such claim to the contrary.
This supports my stance.
The technical contents of my posts are easily verified by reading the technical papers published by and through the auspices of the DVD Forum
http://www.dvdforum.org/forum.shtml
and the technical papers published by the Member Companies of that forum.
To close:
I await your reasoned, non-emotive response, though I fear it may be some time in coming as there is a LOT of technical reading for you to assimilate and understand before you can enter into a discussion of the technicalities of compression quality.
Have fun reading...
Life is just more of the same:
This message has been edited since posting. Last time this message was edited on 17. January 2004 @ 19:49
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AfterDawn Addict
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18. January 2004 @ 02:46 |
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looks like I rattled someones cage!
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AfterDawn Addict
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18. January 2004 @ 02:49 |
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by the way, I meant the way that I spelt found in my thread. I would never criticise anybodys grammar or spelling, only my own! That would be very rude don't you think?
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AfterDawn Addict
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18. January 2004 @ 02:56 |
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You have a masterful command of what I assume is your mother tongue. Procrastintion is indeed a wonderful pastime, I do, however, try to avoid this as I find this an excercise in futility. I prefer to speak as I find.
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AfterDawn Addict
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18. January 2004 @ 02:57 |
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and spell exercise incorrectly!!
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AfterDawn Addict
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18. January 2004 @ 02:59 |
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Isn't this fun?
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brian100
Suspended due to non-functional email address
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18. January 2004 @ 04:29 |
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Interesting thread this..I read all the posts whilst drinking 1 pint of beer out of a 1/2 pint mug.
It would appear to a lot of people, viewing certain highly compressed titles on a "smaller tv (eg less than 28"), that there is negligible "quality loss" from original. It would be best for "these" people to try and find someone with a "larger (plasma or projection)" to test their theories & backups, then re-post here with updates.
Pulsar. In my honest opinion, it is the movie length which generally determines the "quality" of the backup. I have had spectacular results transcoding files from, say 7.5g and lousy results on others that have been compressed from 5g. Shorter films ie less than 1 1/2 hours nearly always compress well. It is only when you pass the 2 1/2 hour mark that quality really does fall off. I appreciate that this is "only my opinion", but I have been doing this nearly 2 years.
I would also like to state that I have never used DVDXCOPY, in any form. I have read so much bad press about the package. There are enough people out here who use SHRINK, DVD2ONE & Pinnacle instantcopy, who's views and opinions I respect.
This message has been edited since posting. Last time this message was edited on 18. January 2004 @ 04:44
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