dvd disc breakup

[taximan]

can anyone help!!
i have burned some dvd-r discs but on play back the picture becomes all broken up and the sound cracks then the picture will freeze and the only way to get things started again is to switch off my dvd player.it seems to happen after about an hour or so into the burned movie.is this an hardware problem or is it something i,m not doing properly.this has happened on most of the discs i,ve done so far.
i,m using claddvd xp,tmpegenc and dvdit pe to copy my dvds to.
any ideas on how i can rectify this problem
del

[spooki]

sounds like you're using poor quality discs, they usually play fine at the beginning then break up as you get further into the film, try some better quality media