Dirty Little Secrets: DVD Life and Longevity Studies:
DVDs: National Archives Public Warning

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Dirty Secrets of DVD Longevity Studies:
National Archives

National Archives: Current Public Advisory:

Recordable (DVD) optical media have widely varying life expectancies. It is not entirely uncommon for some discs to become unreadable in less than 1 year. Relying on recordable discs to last for generations is probably not viable.   

SOURCE: http://www.archives.gov/preservation/formats/video-condition-assessment.html     

Burned (recordable CD-R, DVD-R, BD-R) discs make use of an organic dye layer in order to record data and are typically less reliable because this dye is more susceptible to degradation over time. Recordable CDs, Blu-Rays, and DVDs have proven to be fairly unstable over time, and are deemed a bad choice for long-term preservation.

Source: http://www.archives.gov/preservation/formats/video-important-characteristics.html