i found a solution is to encode the audio in PCM 44.1, 16bits... and converting it with SoundForge in mp3.. after multiplexing the a/v with virtual dub...
how i test it.. easy... playing it.. the sound lost synchronisation 10-15 min later
thanks.. i was able to synchronize it.. but i have the encode the audio in PCM first... asfter that exporting it in VBR mp3.. and finaly use nandub to multiplex the audio and video track... work fine now... that's long.. but do a great job