Problemas com o audio
 

alguem me ajude desde ja agradeço
quando vo fazer a extraçao do audio no virtualdub recebo a seguinte noticia
Virtualdub has detected an improper audio enconding in the
source avi file and wii rewrite the audio header whit standard CRB
values during processing for better compatibilitiy. This may
introduce up to 17241 ms of skew from the video stream. If this unacceptable,
decompress the entire audio strean to an uncompressed WAV file and recompress with a constant birate
encoder birate 126.1 * 124 kbps

Alguem pode me explicar o som ta ficando adiantado no video :(