It’s not clear if you tried Imgburn.
I hear nero 9 is buggy, but I still have nero 6.xxx and I don’t use it for video archiving.
Please try another burn engine.
I’d try Imgburn
and post a burn log or two, as suggested by Dialysis1.
The devil’s in the details…
It also could be something as simple as not finalizing properly, ie., closing the session as these discs play in your burners, but not in your standalone players.
You can try to force finalization with nero cd-dvd speed, Imgburn…