DVD is a standardized optical media format for the encoding and playback of digital video and audio. The DVD format is defined through standards maintained by ISO, the Optical Storage Technology Association and the DVD Forum. The format relies on the UDF filesystem, a uniform directory structure, MPEG-2 video encoding, and various forms of audio encoding. Due to the degradation of organic materials in the discs, the frequency of read errors, and the physical fragility of optical media, DVD should not be used a preservation storage media (especially Write-Once and Rewritable DVDs). The majority of the following resources focus on how to move media off of DVDs, due to this lack of stability.
How Long Can You Store CDs and DVDs and Use Them Again? by Fred Byers
What is the lifetime of CDs, diskettes, ZIP disks, hard drives, tapes, etc.? by Christopher Dicks
An Introduction to Optical Media Preservation by Alexander Duryee
Image and Rip Optical Media Like A Boss by Johan Van Der Knijff
Preserving optical media from the command line by Johan Van Der Knijff
How Long Is Long Term Data Storage by Barry Lunt
Preserving Write-Once DVDs Producing Disc Images, Extracting Content, and Addressing Flaws and Errors by Morgan Morel
NIST/Library of Congress (LoC) Optical Disc Longevity Study by Anna Nhan, O. Slattery, F. Byers, A. Klepchukov, J. Zheng, C. Shahani, M. Youket, E. Eusman, and N. Olson
Getting Public Radio’s Legacy Off Ageing Rewritable CDs: An Interview with WNYC’s John Passmore by Trevor Owens
Disk imaging software
Disk Imaging software
"disktype" can be used for collecting metadata from optical discs.
VLC can be used for playback of DVDs or .VOB files migrated off of DVDs.
MF Digital Ripstation http://www.mfdigital.com/
MF Digital sells Audio, Video, and Digital Ripstations - hardware and software designed for migrating data off of optical media.