Okay, problem kinda resolved; you have to use Dahua's "Smart Player" (Windows or Mac as appropriate) with the .DAV file extension. You just have to get used to ignoring the real time (as the OP says) and work off of it, an hour back.
This made for some VERY, VERY anxious moments... as my NVR was about to over-write the data in question... as I was racing to figure this out. It was of course, a matter with a piece of S__T customer who called a cop because "Um, these people are like, stealing my laptop." Translation; we wouldn't return her ,previously broken laptop, which we repaired, until she PAID us - returned the loaner, and since she kept the loaner 35 days past completion - upon day 10 - and her telling me she didn't have ANY of the money, and wanted to make $50 a month payments, I warned her, if she wouldn't return my laptop in 24 hours, I was going to charge her for rental - which she said "I didn't agree to pay for a computer..." (LOL!!!!) KEEPS IT ANOTHER 25 DAYS - and thinks SHE... is the victim.
The victim of being charged, (and I s__t you not) - $135 for liquid damage repair of her 15" MacBook Pro logic board, which is surgery - and another $50, to replace her display. Which I only did out of empathy for her... as originally I felt pity for her, as she came in claiming she'd suffered a flood. Only later to find out that "She had to buy all new furniture so I don't have money to pay for the laptop." -- Which of course, is why she's ENTITLED to mine for as long as she needs -- until she makes enough money to pay for it... (irrespective the fact someone came in to purchase the computer she'd been "borrowing" during the first TEN DAYS after we finished repairing it... and pretended that a rental isn't implicitly due upon completion of a repair... AND, that I wouldn't have the right to demand the return of my property at my sole discretion.
So YES, I'm THRILLED that my export worked... in which the cop is on video (and audio) reprimanding her for being rude... and where upon she agrees to remove the NEGATIVE REVIEW on yelp that I received - for the poor service of expecting my property back... and in which every single fact-claim she makes is a contradiction of the discussions we had via email. So yes, I do think she has to get sued.