Hi there!
Ok, first of all part of the problem may be that the brand or type of DVD you are using is not compatible with your DVD player. Try burning the project on to a different brand of DVD.
Also, the bitrate at which you have burned the DVD may be too high for the DVD player to handle coming from a home burned DVD.
You can try to lower the bitrate to see what happens.
Ok, I got one more!
When you burned the DVD the disc may have been burned at a speed a little too high so the data on the DVD has corruption. Not enough to upset your computer playback arrangement but enough to annoy your DVD player! Try burning at a slower speed but not too slow! If it is a 16x DVD try burning at 8X or if ot is an 8X try at 4X.
Finally go to this site to see if there are any other things you can do: DVD Repair Tips