“What’s the best digital video file format for preservation?” Finding appropriate digital preservation file formats for audiovisual materials is not an easy task. While much of the recorded sound preservation realm has agreed upon the viability of the Broadcast Wave file format for sound materials, the video realm is still kind of the Wild West in that there is no broad consensus regarding what kinds of file formats or codecs are appropriate for preservation. Many institutions use the AVI container with uncompressed video bit streams as masters. However some institutions prefer QuickTime wrappers for their uncompressed video masters.
Source: Library of Congress