There are strong requirements for video files to be DVD-compliant:
- must be MPEG2
- must have DVD resolutions (720x576 for PAL, 720x480 for NTSC and a few other)
- must have NAV-packets.
If your video does not conform then it should be reencoded (if not MPEG2) or to remuxed it (if w/o NAV-packets). You can do it with Bombono DVD (auto) or use external software, see video conversion software. 1
Or use console programs like ffmpeg, mencoder or mjpegtools. (1)