Different types of feedback messages. Invalid type Generic NACK Temporary Maximum Media Stream Bit Rate Request Temporary Maximum Media Stream Bit Rate Notification Request an SR packet for early synchronization Picture Loss Indication Slice Loss Indication Reference Picture Selection Indication Application layer Feedback Full Intra Request Command Temporal-Spatial Trade-off Request Temporal-Spatial Trade-off Notification Video Back Channel Message Different types of SDES content. Invalid SDES entry End of SDES list Canonical name User name User's electronic mail address User's phone number Geographic user location Name of application or tool Notice about the source Private extensions Different RTCP packet types. Invalid type Sender report Receiver report Source description Goodbye Application defined Transport layer feedback. Payload-specific feedback. Extended report. Types of RTCP Extended Reports, those are defined in RFC 3611 and other RFCs according to the [IANA registry](https://www.iana.org/assignments/rtcp-xr-block-types/rtcp-xr-block-types.xhtml). Invalid XR Report Block Loss RLE Report Block Duplicate RLE Report Block Packet Receipt Times Report Block Receiver Reference Time Report Block Delay since the last Receiver Report Statistics Summary Report Block VoIP Metrics Report Block Feature: `v1_16` Additional RTP buffer flags. These flags can potentially be used on any buffers carrying RTP packets. Note that these are only valid for `gst::Caps` of type: application/x-rtp (x-rtcp). They can conflict with other extended buffer flags. The `gst::Buffer` was once wrapped in a retransmitted packet as specified by RFC 4588. The packet represents redundant RTP packet. The flag is used in gstrtpstorage to be able to hold the packetback and use it only for recovery from packet loss. Since: 1.14 Offset to define more flags. Feature: `v1_10` Additional mapping flags for `RTPBuffer::map`. Skip mapping and validation of RTP padding and RTP pad count when present. Useful for buffers where the padding may be encrypted. Offset to define more flags Standard predefined fixed payload types. The official list is at: http://www.iana.org/assignments/rtp-parameters Audio: reserved: 19 unassigned: 20-23, Video: unassigned: 24, 27, 29, 30, 35-71, 77-95 Reserved for RTCP conflict avoidance: 72-76 ITU-T G.711. mu-law audio (RFC 3551) RFC 3551 says reserved RFC 3551 says reserved GSM audio ITU G.723.1 audio IMA ADPCM wave type (RFC 3551) IMA ADPCM wave type (RFC 3551) experimental linear predictive encoding ITU-T G.711 A-law audio (RFC 3551) ITU-T G.722 (RFC 3551) stereo PCM mono PCM EIA & TIA standard IS-733 Comfort Noise (RFC 3389) Audio MPEG 1-3. ITU-T G.728 Speech coder (RFC 3551) IMA ADPCM wave type (RFC 3551) IMA ADPCM wave type (RFC 3551) ITU-T G.729 Speech coder (RFC 3551) See RFC 2029 ISO Standards 10918-1 and 10918-2 (RFC 2435) nv encoding by Ron Frederick ITU-T Recommendation H.261 (RFC 2032) Video MPEG 1 & 2 (RFC 2250) MPEG-2 transport stream (RFC 2250) Video H263 (RFC 2190) The transfer profile to use. invalid profile the Audio/Visual profile (RFC 3551) the secure Audio/Visual profile (RFC 3711) the Audio/Visual profile with feedback (RFC 4585) the secure Audio/Visual profile with feedback (RFC 5124)