There's multiple video sources. CR, Hulu, Amazon, cable source (they often don't use that one because it's shit, IIRC), it's usually listed in the listing. The "generic" groups usually shits out the same thing from their usual source everytime, that's it
Some "repackaging" and actual subbing groups (they're rare nowadays), the ones that aren't automatic, sometimes go the extra mile to compare video sources and even subs sources to get the best thing around. Some of them do small correction, add typesetting, etc.
