Joining MPG Files

I firstly had 2 SVCD images in the *.cue and *.bin formats. I created 2 mpg files from these (using isoBuster) which I then wanted to join as they have been separated in order to be placed onto 2 CD-R's.

I Used DVTool to merge these files. It works okay on PowerDVD and I can view the entire film. But, Windows Media player can only see up to where the first disc stops and that's all.

As PowerDVD played it alright I then carried on and assumed it would work. I used TMPGEnc Plus (to correct the resolution) and TMPGEnc DVD Author (to make a DVD from this newly created mpg) but it stops playing at the end of the first disc. Is it the first mpg file header that is causing the problem? How do I resolve this? Are there any freebie tools that can help?

Many thanks in advance.