Recently I have been coming across many xvid avi files that I am having trouble extracting audio from or even hearng the audio from. Opeining the avi file in Virtualdub in file info I get the message for the audio unknown tag 0055. Of course this is an mp3 file and I have the suitable codecs to play and encode/decode mp3. Running the files through Gspot they confirm that it is an mp3 file and that I have suitable codecs. However, if I hit render in gspot I get a render failure on the audio. The interesting part is that if I install ffdshow and allow it to decode mp3 then the render in gspot is successful. However, ffdshow audio is not compatible with virtualdub so I still cannot separate out the audio. An interesting thing to not in gspot is that [bold]every single file I have a problem with has been encoded/muxed using nandub 1.0rc2.[/bold] This cannot be a coincidence. Every file that has virtualdub in the header or some other software has no problems. I tried using nandub to separate out the audio but had no success. What is nandub doing to screw these xvid files and what if anything can I do about it? My only solution so far has been to use goldwave in combination with ffdshow.