Have a matrox g400+tv capure card.

Use Avid cinema to produce an AVI with codec Matrox mjpeg

Use nero burning to produce an mpeg straight of the above produced avi file, which plays ok with media-player

Use tmpg to produce an mpeg straight of the above produced avi file, which plays ok with media-player

I now want to re-edit the mpeg with Software being
Magix Videstudio de Luxe 2.0

The tmpg rendered mpg is ok the nero mpg will not come on the time line

Question is, does tmpg use a different Codec to Nero? I thought that whatever mpeg is created it will always have the same codec, if even a codec is required.