Subtitles not synchronised

vbimport

#1

Can anyone tell me why my subs are not synchronised please.
I have just converted an avi to dvd with VSO convert x to DVD.
The file did not have subs included. I sourced a .srt file elsewhere and added it in before conversion. The subs are in there but not synchronised with the speech.

Any suggestions welcome. Thanks in advance

jonesthetaxi.