The scan doesn’t look all that bad. I’ve seen much worse that played well. I still recommend changing media to Verbatim 16x—just avoid the ones made in India. The Taiwanese Verbatim single layer disks are very good.
It looks like you burned this movie in the PBDS drive and scanned in the NEC. The PBDS is a Phillips/BenQ drive that is actually a rebadged Lite-on. Then sold by Dell. Can that get any more confusing? In any case, the Lite-on based drives are generally very good scanners, so I would use it for scanning your burned disks.
I think I would go to the NEC/Optiarc forum here at cdfreaks and see if you can find any threads on the 7191s burner. See what other people are using for media, and what is working well. Verbatim and TY are usually good with anything, so those would be safe choices for your drive, I would think. And changing the media would be what I would try next.
Good luck. Let us know how things are progressing.
Edit: Forgot to mention this. If you want to try again with the CMC disks you have now, reduce the burning speed to 8x. Actually this is the speed I burn all my dvd video, so you might want to do this with new disks too.