Gerry,
This may or may not help your problem, (it certainly won't hurt):
Tayo Yuden brand discs seem to be very consistent in terms of quality of build;
they're made in Japan, if that means anything, (I think it does).
Brand #S12199.
They are more expensive, but you can see, (and feel) the quality difference.
We've gotten them from ULine mail order, (1-800-295-5510), or uline.com
Never had one that didn't play.
The cheaper discs are made in Taiwan, China etc. some of them are so poor
that they are better used as coasters; (not joking about that).
Unfortunately, several well known stores carries the poorest quality.
You can download a disc code software reader for free, which matches up
the disc model number, and tells you where it was made; (see links below).
This can really help trace the quality of the disc, and give you peace of mind.
I was personally shocked as to how many "brand" discs are listed
in the "rated lowest quality" section.
Alternatively, if you get them stamped (at a company like Dub-it), for bigger projects,
the playability will go up; (the cost, is of course, significantly higher).
DVDs are much more "finicky" than CDs, both in playability, and durability;
(they both fly through the air about the same distance); and you'll take
some one's eye out, ( as mom said), with either.
For a grasp of how big this issue is, try:
http://www.digitalfaq.com/media/dvdmedia.htm (brilliant, all you'll ever want to know!)
OR
http://www.best-dvd-burning-software-reviews.com/best-blank-dvd-media.asp
Regards,
T
Also second Michael's comments, although I've had good results with both VBR and CBR.