Usage : sndfile-concat <infile1> <infile2>  ... <outfile>

    Create a new output file <outfile> containing the concatenated
    audio data from froms <infile1> <infile2> ....

    The joined file will be encoded in the same format as the data
    in infile1, with all the data in subsequent files automatically
    converted to the correct encoding.

    The only restriction is that the two files must have the same
    number of channels.