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During processing, appraise and describe digital audio and video files in the same way as you would analog. It will most likely be easier for you to watch/listen to the files, and the file length will be easier to ascertain.
As with all born digital material, add another extent line for electronic files
EXAMPLE: 36.25 linear feet (86 file boxes, 1 card file box)
xx megabytes (4 files)
Digital A/V should be listed at the item level (as we do with analog) and description should follow this format:
Title. Description, Date. Format. Time.
EXAMPLE: E.5. Packing party at Morgan State University, 2011. Digital video, 1 minute.
from From Sister Soldier Project Records)
Example TK from Robin Kilson Papers