Hi when i´m trying to add vobsub in the meny of virtaldub " video and filters" It says vobsub not deteced..so can some one help me.

The first step I do is: first open virtaldub then adding avi file, then i go to video adding subtitlers, then i starting frame server, i also check preview and everything working perfectly.. here comes the problem when i´m starting TMPGEnc and have done the encoding process. and i have the mpg file in preview mode i can´t see the subtitel..what are i doing wrong..