Always having the access to the content (TV company goes under, licensing conditions change)
Durability (not losing what you have)
Curating (sorting it properly)
Not losing precision - saving metadata in as faithful way as possible
Maybe instead of converting data on ingestion, transcode it when needed - that way you'll always have the original and you know you're not losing any data (think Windows XP rotating an image => lose EXIF data => lose geotags etc. all camera-related info)
Store, normalize, clean up all related metadata like TV show episode title, description, foreign keys, thumbnail (often could be taken by a professional photographer instead of a in-video framegrab)
TODO: why/how/etc.