Sound and video in sync

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Sound and video in sync

jackyr
I

I am encoding vob to flv H264 conferences about 90mn large
some files have to be concatened together,  once done
I run ffmpeg to recreate the timespec (the whole process
takes about 12 hours including 2 passes)
 
the probleme comes when i have to delete some beginning which
are not really part of the conferences.
 
I look into the logs to check where are the mainframes and cut
Using -ss . Many time the sound is out of synch

I have tried virtualdub, as they save in avi format I have to load
the full 5Gb file and it takes too long and some time stops
 
I have tried to split sound and video cut and remux then its worse

Do you have some advices ?

many thanks
jacky

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