AudioVisual Preservation Solutions has released A Primer on Codecs for Moving Image and Sound Archives: 10 Recommendations for Codec Selection and Management.
Here's an excerpt from the announcement:
One area of great concern for the integrity and persistence of digital audio and video files is the selection of file formats and codecs… Though this is also an area where there is a great lack of certainty and clarity on the issue.
This paper by Chris Lacinak lays out a clear explanation of what codecs are, how they are used, and what their selection and application means to archives. Also provided are 10 recommendations that will help you in the selection and management of codecs in an archival setting.