DVD decrypter/ripper like Exact Audio Copy?

[Mega-Splat]

I was wondering if there's a DVD version along the lines of music cd ripper Exact Audio Copy? IOW, something with error detection as capable as EAC. Is there such a beast?

[LIGHTNING UK!]

I'm sure it's different for DVD because of the whole way it's constructed.

EAC probably makes use of subchannel info for cds but no such thing exists on dvd.

What exactly are you worried about?!

[Mega-Splat]

Errors. EAC is the best ripper out there for audio CDs because of its error handling. I was wondering if anything out there exists for DVD ripping that has the high standard EAC has.

[Fr4nz]

You have a big chaos in your mind. Audio-CDs, Data-CDs, DVDs and so on have all different error-correction systems.

I won't explain them all to you, for this purpose there's google.

Anyway, use DVD-Decrypter, if there's an error on the DVD you're ripping it will report that to you.

[Mega-Splat]

Thanks but I know the differences. You guys are missing my point. Well, I guess there's no such sw out there.

[LIGHTNING UK!]

When you install programs off cds and dvds, do you worry that the files are corrupt?! I know I dont. So why worry about ripping issues?

I doubt there are any programs that perform any sort of error correction on Mode 1 data discs - there is just no need for it! Not only that, there's not really anything to perform error checking with! DVD Decrypter performs basic checking by looking at the packheader start code of each sector in a vob. That's more than any other ripping tools do.

[Got Milk?]

If I remember correctly, EAC reads each sector of the disc at least twice, if the data is different the sector is read 16 more times, if the data read this time is the same 8 or more times it uses that as the data.

There is a note on the website that the Red Book standard used on audio CDs is very weak, so maybe it's not necessary for DVDs. But I had wondered how secure the ripping of DVDs was - i.e. if there is a possibility for errors to occur.

[LIGHTNING UK!]

Blimey, I never thought of doing anything like that!

I guess it's an option if you're really anal about these things!

[Rat Killer]

My how things are forgotten as technology moves on.

Audio rippers (Digital Audio Extraction) needed to attempt error correction because the 'file system' for CD-DA (digital audio) disks has no inherrent error correction. Its just a stream of bits. A missed bit here and there simply cannot be heard in a PCM audio stream. Mode 1 data CDs and DVDs in a similar fashion have inherrent parity error correction in the file system. A missed bit here and there is corrected on the fly. The system does not 'read' an error until there are too many bits to correct using the available error correction bits.

I one wants to see the underlying bit level error rates (they are not zero) for data CDs and DVDs a program such as Plextor Tools can show them to you from the drives perspective. The operating system never sees them as they are corrected in the drive before being passed to the computer.

Ok, thats the limit of what I remember and was kinda neat to be able to help out the very knowledgeable folks on this forum. I'll now go back to silent mode.

Rat Killer

[Matthew]

I've had errors creep through DVD Decrypter a couple of times - crappy DVDROM drive + scratched disc. Extracting the audio and running it through besplit picked up the problem though :) So there are crude checks available.