"no audio track" by tcprobe, but I can hear it

Hi there,

I am trying to transcode a series of VOB files in my hard disk to avi. When I 
watch these files with vlc, they play just fine (with sound), but both tcprobe 
and transcode commands report no audio in these particular VOB files.

1. Has anybody encountered this before? If so, what is the reason for this 
strange behavior?

If I ignore the error message (i.e. no audio) and let transcode do the job, 
the resulting avi file has no audio, not very surprisingly.

2. Can anybody recommend a solution to this problem? Any idea will be much 
appreciated.

Regards,

Hakan

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEABECAAYFAkmI/nYACgkQu5WqKQPUC0vE6QCfQp90n24dNff56YO6Z5eLK9gZ
rUcAn1Z11flR5uTRE2XYuBF3C4sK9gop
=7tI5
-----END PGP SIGNATURE-----