The data formats available depend on the output file type. Print a list of options and exit. By default, the output file contains a standard audio file information string. This information can be changed with the header information string which is specified as one of the command line options. Structured information records should adhere to the above format with a named field terminated by a colon, followed by numeric data or text.
Comments can follow as unstructured information.
If the information string starts with a record delimiter, the header information string is appended to the standard header information. If not, the user supplied header information string appears alone.