If you don't see all codecs in VirtualDub, VirtualdubMod or other programs try this small tool coded by Koepi (the author of well-known XviD binaries).

So if you experience this problem, download and execute Vidc.Cleaner and look carefully into the output window. Does a line like:

"EMPTY!: * = empty -> Fixed." or
"EMPTY!: * = empty -> Unable to fix."

appear? Does the codec show up afterwards (maybe a reboot is needed, or a least a restart of your encoding application).

Important Note :

- You may need more than one run to clean all empty lines.