VirutalDub 에서

1) File -> "Open video File"
2) Check that Audio -> "Source audio" is set
3) Audio -> "Full processing mode"
4) Audio -> Compression -> <No Compression (PCM)>
5) File -> "Save WAV" (that will make the large WAV, like 1GB for a movie)
6) Then, Audio -> "WAV audio", select the WAV saved in previous step
7) Audio -> "Full processing mode" (still should be set)
8) Audio -> Compression -> whatever you want here, but Lame MP3 mentioned above sounds good or AC3
9) Video -> "Direct stream copy"
10) File -> "Save as AVI" as choose your name and wait some minutes

깨진 파일을 열어서, 소리(audio) 부분만 (압축이 안된) PCM wav 형태로 저장
그 다음에 이걸 가지고 Video 부분과 합쳐서 새로 avi 파일을 만든다.

출처:
http://forum.videohelp.com/topic239213.html