You could be having one of three problems :
1) You created a DVD that is the media wrong type to be played on specific DVD players, that would be either a +R, -R, or RW meda. Check the spec's for the player to see if it will read that format.
2) Even if correct media is used, most DVD players will only play certain formats, that would be DVD format, MP3, AVI, etc.
3) Even though you were able to read via the program a PAL format, the OUTPUT might also be PAL. US Players (not computer DVD drives) can NOT play those unless you change the COUNTRY CODE in the player. Note that on some you can set it, some you can't, some have an ALL COUNTRY setting, and some do allow change, but only once.
What is the format of the output DVD you created? What files are on it?