Joining files MPEG-2

[MarcCama]

I need to create a video joining two files MPEG-2.
To this I already used two software: Ulead VideoStudio 7 and MGI VideoWave III, and in both is happening the same thing.
When I generate the new file MPEG-2, after few moments, the sound was unbalanced of the image (the sound comes after the image).
Does anybody have some idea of how to solve this problem?

Thank you very much.

 

[MasterofNone]

TMPGEnc has a tool for joining mpeg2 video. Haven't had any issues when I've used this. Although it generally prefers to join mpeg2 videos which was encoding using its engine.