Need to fix a few mpg files

[vitamine]

I got a few mpg files and I belive they are svcd files. Somehow when I try to open them with any programs, it won't play at all. They were downloaded and should be complete files but they won't play. Is there away I can fix this by some mean of cutting, or whatever tools I can use to make them play even if I have to cut a little off. I tried the simple mulitplex in tmpgenc but when I open the file I get the "illegal mpeg video stream" error. Please help.

[Betamax]

First try using these throught the program VCDxmInfo (a tool of the bundle VCDimager).
VCDxmInfo analizes the stream and tells you if it is a valid mpeg or not. If it is valid, it will also tell you which type it is (mpeg-1/-2).