I burned an iso image to DVD using DVD encypter successfully. It played back with great quality on my computer, but would not play in either my PS2 or either of my DVD players which have played even the crappiest of DVD -r media.
I brought this to a friend of mine for advice, and he says sometimes when he makes movies and has similar issues, he "converts" them before he puts them on a DVD.
Now as long as I've been doing this, I've gone ISO to DVD with no issues at all. Anyone have any clue what he's talking about??