DVD Ripping with scratch tolerance - like Exact Audio Copy

[feelart]

Hi,

I'm looking for a software that can rip lightly scratched DVD to HDD.

I made a test on a DVD, with DVD Shrink, DVDFAb 8.1 & 1,2,3 Copy DVD Platinium, all 3 give different (MD5 different) VOBs and when I play them on my SmartTV through at a certain moment it freezes as if in pause.

Is there some equivalent like EAC (Exact Audio Copy) for DVDs ??

Thanks.

[hello_hello]

The reason for software such as EAC using "secure" CD ripping is due to the fact audio CDs don't have much in the way of built in error correction. A program such as EAC can't (to the best of my knowledge) know for sure if a CD is copied correctly. Instead it reads a section of the disc more than once and accepts it's got the correct data when it's reading the same data more than once. That's why EAC also uses AccurateRip to verify a CD rip against other people's rips of the same CD.

DVDs on the other hand have much better error correction. To the best of my knowledge the error correction not only allows the DVD drive (or ripping program) to correct many read errors, it'll also ensure the disc is being read correctly or the process will fail.

Ripping programs have copy protection to contend with, they can remap streams when ripping, some will stop dead when encountering errors, others will keep trying and/or fill the unreadable section with dummy data.... there's probably no guarantee a ripping program will simply "copy" the files on the disc, but that doesn't mean it hasn't ripped it correctly. I assume your test DVD doesn't have any sort of copy protection? What happens if you simply copy the files off it using Windows Explorer rather than use a ripping program? Do you still end up with freezing at the same point? There's possibly a lot of reasons for the problem which don't actually have anything to do with the way the disc was ripped as such. Assuming the disc isn't copy protected the first thing to try would be a straight copy rather than ripping. Even if for no other reason to ensure the problem wasn't caused when writing the disc rather than when reading it. Even playing the disc in a player probably won't help, because as far as I know a DVD player will probably skip over minor errors rather than simply stop playing. If Windows Explorer can't read the disc data correctly the copy process will fail.

One other thought..... if a drive has trouble reading a section of a DVD it'll usually slow to a crawl while trying to read. If the drive reads the whole disc without slowing down it's probably a good indication the disc is being read easily, and correctly, and it's the actual files on the disc which have a problem, rather than it being caused by an inability of the drive to read the disc correctly.

That's my thoughts based on what I know anyway. Maybe someone else will have some more clever ideas.

[Steve(MS)]

If you are dealing with commercial discs, then you need to use anydvd or dvdfab.
Some burners/writers deal (read discs) with scratches better than others, this is what you need to research for copying.
Some burners write to disc better than others.
Some dvd players handle error correction better than others.
Some blank discs are better than others.
One burner software is better than the rest--imgburn.
Wrong settings with the any of above can screw up a disc.
Any or all of the above wrongly implemented could be screwing up your results.

[feelart]

Some facts:
1/ It's a commercial DVD
2/ Ripping twice DVDFab 8.2.1.5 Qt, leads to identical ripped files (MD5 equivalent)
3/ Ripping with DVDShrink, 123CopyDVD or DVDFab, leads to MD5 different files.
4/ If all rippers ripped VTS_01_4.VOB, any rip of this VOB, when played freezes at a certain moment (after 19min).
(Of course, all rippings were performed on same hardware and same DVD)

So my question are:
1/ how do you know about the quality of the rip ??
http://dvd-ripper-software-review.toptenreviews.com/
2/ After ripping complete, why they all lead to a freezing play with VTS_01_4.VOB ??

DVDs on the other hand have much better error correction.

Maybe

The reason for software such as EAC using "secure" CD ripping is due to the fact audio CDs don't have much in the way of built in error correction. A program such as EAC can't (to the best of my knowledge) know for sure if a CD is copied correctly. Instead it reads a section of the disc more than once and accepts it's got the correct data when it's reading the same data more than once. That's why EAC also uses AccurateRip to verify a CD rip against other people's rips of the same CD.

To my understanding:
1/ AccurateRip data might not be available, because for instance failed to recognize the source, I just ripped a CD in Polish for instance, to have it on my smartphone.
2/

EAC can't (to the best of my knowledge) know for sure if a CD is copied correctly.

I understand that it makes at least 2 reads of the same chunck of data in order to verify that it provides the same read feed, if so, is considered as correct, if not EAC attempts again till found the most frequent one (builds a histogram).

[hech54]

Oh my. Yet another EAC bit-picker. This will end the same as all of the others.

[hello_hello]

So my question are:
1/ how do you know about the quality of the rip ??

Generally if it rips successfully then it's good quality. I've never even thought about ripping DVDs the way you are.... ie wondering if they should be ripped like CDs, because to the best of my knowledge the disc will either be read correctly due to the error correction, or the ripping process will fail (some rippers may insert dummy data if they can't read little sections of the disc properly). As far as I know either a disc will rip correctly or it won't..... at least in respect to reading the disc. Getting around the copy protection is probably a whole other topic, and successfully doing so would be a prerequisite for a good rip.....

2/ After ripping complete, why they all lead to a freezing play with VTS_01_4.VOB ??

It could be the disc itself wasn't authored properly, or there's copy protection involved. I really don't know a lot about DVD copy protection but it can involve dud/fake sectors on the disc and vob files containing non-video data which probably should be cleaned out. Or maybe there's just something odd about the video in that particular vob file which causes your players to freeze, but it's something unique to the disc you're using and not a result of ripping.
To be honest I've ripped lots of DVDs for encoding but rarely kept or even tried to play the original video before converting it. Generally when you rip a DVD it either rips correctly or it doesn't. If the ripping program you're using doesn't let you know when it's not been able to read the whole disc, maybe it's not a ripping program you should be using.

DVDs on the other hand have much better error correction.

Maybe

Okay.

To my understanding:
1/ AccurateRip data might not be available, because for instance failed to recognize the source, I just ripped a CD in Polish for instance, to have it on my smartphone.
2/I understand that it makes at least 2 reads of the same chunck of data in order to verify that it provides the same read feed, if so, is considered as correct, if not EAC attempts again till found the most frequent one (builds a histogram).

That sounds a lot like what I said. Many CD ripping programs have a "secure" ripping mode.

[Steve(MS)]

fellart, are you playing the copied dvd on a dvd player or some other device?
What is the model of the device you are using for playback?

Understand something, no one has ever asked this question that you have posed here because you are
going about this wrongly....there is nothing to worry about using for instance dvdfab to copy a disc
and then say use imgburn to write it back to disc.
Your problem has nothing to do with dvdfab copy software if that is what you are using.
It has to do with the list I provided..so far you are not smart enough to realize it.