Really strange. I could understand that libav has trouble with the input file, but the error is related to the output: "unknown audio output format!" AC3 is unknown to libav? Obviously, there is a bug somewhere in the libav decoder.
If you cannot find a shorter file with the same problem, you can probably cut the Lion King dtshdma file, and send only the beginning. There are several methods to cut a file. The easiest one might be
jsoto's CutFile. My email address is pgcedit at "you know the google email service name". (You can also find it in the Contact section of the PgcEdit home page. See my signature.)