(RFC 6682 published August 2012, subtype last updated August 2012) Type name: audio Subtype name: raptorfec Required parameters: o rate: The RTP timestamp (clock) rate. The RTP timestamp (clock) rate is specified in Hz and the format is unsigned integer. o raptor-scheme-id: The value of this parameter is the FEC Scheme ID for the specific Raptor FEC Scheme that will be used as defined in [RFC6681]. o Kmax: The value of this parameter is the FEC Framework Configuration Information element, MSBL, as defined in [RFC6681], encoded as a unsigned integer. For specific requirements for this value, refer to [RFC6681]. o T: The value of this parameter is the FEC Framework Configuration Information element, encoding symbol size, as defined in [RFC6681], encoded as a unsigned integer. For specific requirements for this value, refer to [RFC6681]. o repair-window: The maximum time that spans the source packets and the corresponding repair packets. The size of the repair window is specified in microseconds and the format is unsigned integer. Optional parameters: o P: The value of this parameter is the FEC Framework Configuration Information element, Payload ID Format, as defined in [RFC6681]. The default value of this parameter (when it does not appear explicitly) is 'A'. Encoding considerations: This media type is framed and binary; see Section 4.8 in [RFC4288]. Security considerations: Please see the security considerations in [RFC6363]. Interoperability considerations: Published specification: [RFC6681] Applications that use this media type: Real-time multimedia applications like video streaming, audio streaming, and video conferencing. Additional information: Magic number(s): File extension(s): Macintosh file type code(s): Person & email address to contact for further information: Thomas Stockhammer, stockhammer&nomor.de Intended usage: COMMON Restrictions on usage: This media type depends on RTP framing, and hence is only defined for transfer via RTP [RFC3550]. Transport within other framing protocols is not defined at this time. Author: Thomas Stockhammer, Nomor Research. Change controller: IETF PAYLOAD working group delegated from the IESG.