problem playing DVD after conversion from AVI

Hi
My name is robbee111. I had copied several AVI format movies on my hard drive. I then used a converter AVI to DVD, which converts the AVI in order to play on my DVD player. My problem is some of my converted DVD wont play on my stand-alone (Samsung) player. Some of them will play. Can u help me with any solutions . I get a error message " cannot read disk". However the disk will play on my home computer DVD. Why is this...I also tried to use DECRYPTER with the converted dvd disk as my Source, and created ISO file as my destination. Then I tried to Burn with DECRYPTER. The decryption worked and the burned worked, however when tryied to play the burned disk again. ERROR Disk appeared again. Any help I would appriciate much.

Thanks
robbee111