If the MPEGs are already in a DVD compliant format (ie. mpg-2 + ac3/mp2/pcm audio + correct framesize + bitrate) then you can use an authoring tool such as DVD-Lab (www.mediachance.com - 30 day trial) to author a disc so that all of your MPEGs play seamlessly.
Within DVD-Lab, load each MPEG into a "movie" container and then join each movie in the "connections" window. Then compile your DVD, check that it plays fine with a software DVD player (PowerDVD or WinDVD) and then burn using Nero.
DVD-Lab will not re-encode your video.