I assume
(raw vid 5:5). EX-rvid5774
means a raw video clip 5 minutes 5 seconds long, from (EX) the raw video cataloged as Item # 5774 in the forensic examination of the Weiner laptop.
I have no idea what the plus signs mean.
I could be totally wrong with this guess but we have to make a hypothesis and then keep it in mind while looking for evidence that it's right or wrong.