Table:
text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
0 PCMU audio 1 8000 any 20 ITU-T G.711 PCM µ-Law Audio 64 kbit/s RFC 3551
1 reserved (previously 1016) audio 1 8000   reserved, previously CELP Audio 4.8 kbit/s RFC 3551, previously RFC 1890
2 reserved (previously G721) audio 1 8000   reserved, previously ITU-T G.721 ADPCM Audio 32 kbit/s RFC 3551, previously RFC 1890
3 GSM audio 1 8000 20 20 European GSM Full Rate Audio 13 kbit/s (GSM 06.10) RFC 3551
4 G723 audio 1 8000 30 30 ITU-T G.723.1 RFC 3551
5 DVI4 audio 1 8000 any 20 IMA ADPCM Audio 32 kbit/s RFC 3551

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
6 DVI4 audio 1 16000 any 20 IMA ADPCM 64 kbit/s RFC 3551
7 LPC audio 1 8000 any 20 Experimental Linear Predictive Coding Audio RFC 3551
8 PCMA audio 1 8000 any 20 ITU-T G.711 PCM A-Law Audio 64 kbit/s RFC 3551
9 G722 audio 1 8000 any 20 ITU-T G.722 Audio RFC 3551 - Page 14
10 L16 audio 2 44100 any 20 Linear PCM 16-bit Stereo Audio 1411.2 kbit/s, uncompressed RFC 3551, Page 27
11 L16 audio 1 44100 any 20 Linear PCM 16-bit Audio 705.6 kbit/s, uncompressed RFC 3551, Page 27
12 QCELP audio 1 8000 20 20 Qualcomm Code Excited Linear Prediction RFC 2658, RFC 3551

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
13 CN audio 1 8000   Comfort noise. Payload type used with audio codecs that do not support comfort noise as part of the codec itself such as G.711, G.722.1, G.722, G.726, G.727, G.728, GSM 06.10, Siren, and RTAudio. RFC 3389
14 MPA audio 1 90000   MPEG-1 or MPEG-2 Audio Only RFC 3551, RFC 2250
15 G728 audio 1 8000 2.5 20 ITU-T G.728 Audio 16 kbit/s RFC 3551
16 DVI4 audio 1 11025 any 20 IMA ADPCM RFC 3551
17 DVI4 audio 1 22050 any 20 IMA ADPCM RFC 3551
18 G729 audio 1 8000 10 20 ITU-T G.729 and G.729a RFC 3551, Page 20
25 CELB video 1 90000   Sun`s CellB Video Encoding RFC 2029
26 JPEG video 1 90000   JPEG Video RFC 2435
28 NV video 1 90000   Xerox PARC`s Network Video (nv) RFC 3551, Page 32

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
31 H261 video 1 90000   ITU-T H.261 Video RFC 4587
32 MPV video 1 90000   MPEG-1 and MPEG-2 Video RFC 2250
33 MP2T audio/video 1 90000   MPEG-2 transport stream Video RFC 2250
34 H263 video  90000   H.263 video, first version (1996) RFC 3551, RFC 2190
35 - 71 unassigned       RFC 3551, Page 32
72 - 76 Reserved for RTCP conflict avoidance N/A  N/A    RFC 3551, Page 32
77 - 95 unassigned       RFC 3551, Page 32
dynamic H263-1998 video  90000   H.263 video, second version (1998) RFC 3551, RFC 4629, RFC 2190
dynamic H263-2000 video  90000   H.263 video, third version (2000) RFC 4629

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic (or profile) H264 video  90000   H.264 video (MPEG-4 Part 10) RFC 6184, previously RFC 3984
dynamic (or profile) theora video  90000   Theora video draft-barbato-avt-rtp-theora-01
dynamic iLBC audio 1 8000 20 or 30 20 or 30, respectively Internet low Bitrate Codec 13.33 or 15.2 kbit/s RFC 3952
dynamic PCMA-WB audio  16000 5  ITU-T G.711.1, A-law RFC 5391
dynamic PCMU-WB audio  16000 5  ITU-T G.711.1, µ-law RFC 5391
dynamic G718 audio  32000 (placeholder) 20  ITU-T G.718 draft-ietf-avt-rtp-g718-03
dynamic G719 audio (various) 48000 20  ITU-T G.719 RFC 5404
dynamic G7221 audio  32000, 16000 20  ITU-T G.722.1 RFC 5577
dynamic G726-16 audio 1 8000 any 20 ITU-T G.726 audio with 16 kbit/s RFC 3551

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic G726-24 audio 1 8000 any 20 ITU-T G.726 audio with 24 kbit/s RFC 3551
dynamic G726-32 audio 1 8000 any 20 ITU-T G.726 audio with 32 kbit/s RFC 3551
dynamic G726-40 audio 1 8000 any 20 ITU-T G.726 audio with 40 kbit/s RFC 3551
dynamic G729D audio 1 8000 10 20 ITU-T G.729 Annex D RFC 3551
dynamic G729E audio 1 8000 10 20 ITU-T G.729 Annex E RFC 3551
dynamic G7291 audio  16000 20  ITU-T G.729.1 RFC 4749
dynamic GSM-EFR audio 1 8000 20 20 ITU-T GSM-EFR (GSM 06.60) RFC 3551
dynamic GSM-HR-08 audio 1 8000 20  ITU-T GSM-HR (GSM 06.20) RFC 5993

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic (or profile) AMR audio (various) 8000 20  Adaptive Multi-Rate audio RFC 4867
dynamic (or profile) AMR-WB audio (various) 16000 20  Adaptive Multi-Rate Wideband audio (ITU-T G.722.2) RFC 4867
dynamic (or profile) AMR-WB+ audio 1, 2 or omit 72000 80 (super-frame; internally divided in to transport frames of 13.33, 14.22, 15, 16, 17.78, 20, 21.33, 24, 26.67, 30, 35.55, or 40)  Extended Adaptive Multi Rate – WideBand audio RFC 4352
dynamic (or profile) vorbis audio (various) any (must be a multiple of sample rate)  as many Vorbis packets as fit within the path MTU, unless it exceeds an application`s desired transmission latency RTP Payload Format for Vorbis Encoded Audio RFC 5215

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic (or profile) opus audio 1, 2 48000 2.5, 5, 10, 20, 40, or 60 20, minimum allowed value 3 (rounded from 2.5), maximum allowed value 120 (allowed values are 3, 5, 10, 20, 40, or 60 or an arbitrary multiple of Opus frame sizes rounded up to the next full integer value up to a maximum value of 120) RTP Payload Format for Opus Speech and Audio Codec draft
dynamic (or profile) speex audio 1 8000, 16000 or 32000 20  RTP Payload Format for the Speex Codec RFC 5574
dynamic (96-127) mpa-robust audio  90000   A More Loss-Tolerant RTP Payload Format for MP3 Audio RFC 5219
dynamic (or profile) MP4A-LATM audio  90000 or others  recommended same as frame size RTP Payload Format for MPEG-4 Audio RFC 6416 (previously RFC 3016)
dynamic (or profile) MP4V-ES video  90000 or others  recommended same as frame size RTP Payload Format for MPEG-4 Visual RFC 6416 (previously RFC 3016)

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic (or profile) mpeg4-generic audio/video  90000 or other   RTP Payload Format for Transport of MPEG-4 Elementary Streams RFC 3640
dynamic VP8 video  90000   RTP Payload Format for Transport of VP8 Streams draft-ietf-payload-vp8-08
dynamic L8 audio (various) (various) any 20 Linear PCM 8-bit audio with 128 offset RFC 3551 Section 4.5.10 and Table 5
dynamic DAT12 audio (various) 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 or others any 20 (by analogy with L16) IEC 61119 12-bit nonlinear audio RFC 3190 Section 3
dynamic L16 audio (various) 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 or others any 20 Linear PCM 16-bit audio RFC 3551 Section 4.5.11, RFC 2586

text: RTP audio video profile
Audio and video payload types
Audio and video payload types
Payload_type_PT Name_ Type_ No_of_channels Clock_rate_Hz Frame_size_ms Default_packet_size_ms Description References_
dynamic L20 audio (various) 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 or others any 20 (by analogy with L16) Linear PCM 20-bit audio RFC 3190 Section 4
dynamic L24 audio (various) 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000 or others any 20 (by analogy with L16) Linear PCM 24-bit audio RFC 3190 Section 4

Question: What is the average number of channels for the RTP audio-video profile?