proper cutting point

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proper cutting point

I am doing VOB to FLV  convertion , the sources are quite large (about 90 minutes) and time to time the beginning should be suppressed  this is my problem
Founding the cutting point can be done either with VLC or VirtualDump lets name it CT
Running FFMPEG –ss CT  -i input ….

I found 2 cases

1- FFmpeg does not cut any (may be I am far off a keyframe ? )
2- FFmpeg does cut the video but the sound is out of synch
Am I doing wrong ? Is there any parameters which would tell :
   “cut around CT at the right place (+/- 1 second) “  

What are your advices ?

Thanks to all