Mux avi + audio, something wrong, an issue ? (solved by myself)

[sepulcrio]

Mac OSX 10.5.1.

When i try to mux an avi (xvid) + another audio track (tool avi+1) very often don't work. If work, the file has some problem. When i use the muxed file on a standalone player it is impossible to change the audio track or use fast forward. The player freeze.
Same problem using d-vision. Only handbrake produce very perfect muxed file.

So I try to use VirtualDubMod to correct the wrong muxed file. VirtualDubMod, when i load the muxed file, say to me that there is a problem about the second (muxed) track. Exactly it say that the header of the second track tell that the the file is encoded in wrong way VBR instead of CBR and VirtualDub ask the permission to rewrite header. I say ok and then the muxed avi work fine in standalone player and in pc.

Is it possible solve this problem.
Thank for replay, and sorry for my english.

[captvanhalen]

Are you possibly forgetting to select AVI +audio in the "Mux as:" drop down box?

[sepulcrio]

I solved using binary ffmpeg and a command line string:

ffmpeg -i input.avi -i audiotoadd.mp3 -ab 128 -acodec mp3 -vcodec copy -f avi newmuxedfile.avi -acodec copy -ab 128 -newaudio

In this way work either on pc and standalone player. !!!