To create a video file to play on a DVD player, you must make a "Video" DVD and not a "Data" DVD. If you are trying to burn the converted files directly to the DVD then probably you are making a "Data" DVD.

DVD burning software, like Nero Vision, contain specific type of DVD project that you can use to create "Video" DVD. Look for a similar setting on your burning software.

You can also convert your video files to DV-AVI files and then use any burning software to burn the videos to DVD-R.

A DVD burning software will subject the DVD format file (MPEG 2) produced by Digital Media Converter to a compression process before actually writing the file to the DVD.

A DVD format file will fit in the DVD disk if:
1. The DVD format file is in standard MPEG 2 NTSC or PAL
2. The duration (not the size) of the DVD format file is less than that the DVD disk can hold

Note:
When burning to a DVD disk, make sure that you select "DVD video" and not data DVD. DVD videos are the underlying read format for a DVD player.