MPEG is 50 mins in media player, but TMPGEnc only sees first 10 mins

I have downloaded a video file which plays fine in Windows Media Player and is 50 minutes long, but when trying to put it onto VCD using VCD Easy it only see's the first 6 minutes, if I try and open it in TMPGEnc it only see's the first 10 minutes, I have tried re-converting the file using TMPGEnc but again it only does the first 10 minutes, I assume there is a problem with the original MPG file, any suggestions on how I resolve this?

 

re-GOP it, using chezz I can't remember oh wait I know is Vitec VIDEO Clip MPEG-2 PRO v2.0