Con VirtualDub, apri il file AVI definitivo (menu File > Open video file...).
Dal menu Video seleziona "Direct stream copy".
Dal menu Audio seleziona AVI Audio e "Direct stream copy".
Sempre dal menu Audio seleziona l'opzione "Interleaving...".
Nella casella "Delay audio track by ... ms" del riquadro "Audio skew correction"
immetti un valore positivo se l'audio in anticipo rispetto al video
o un valore negativo se l'audio in ritardo rispetto al video
(puoi provare ad esempio con 300 o -300).
Premi su OK, salva il file AVI (tasto F7) e controlla se il problema stato risolto.
Se non, prova con valori pigrandi.
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