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1pt 111
2 
3        "a=rtpmap:111 opus/48000/2",
4        "a=rtcp-fb:111 transport-cc",
5        "a=fmtp:111 minptime=10;useinbandfec=1",
6 
7AUDIO extmap
8 
9        "a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level",
10        "a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
11        "a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01",
12        "a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid",
13 
14h264 profiles
15 
16* 42 00 1f - 4200=baseline (B)              1f=level 3.1
17* 42 e0 1f - 42e0=constrained baseline (CB) 1f=level 3.1
18* 4d 00 1f - 4d00=main (M)                  1f=level 3.1
19* 64 00 1f - 6400=high (H)                  1f=level 3.1
20 
21VIDEO extmap
22 
23        "a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time",
24        "a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01",
25        "a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid",
26        "a=extmap:5 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay",
27        "a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type",
28        "a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing",
29        "a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/color-space",
30        "a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
31        "a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id",
32        "a=extmap:13 urn:3gpp:video-orientation",
33        "a=extmap:14 urn:ietf:params:rtp-hdrext:toffset",
34 
35pt 96 + 97
36 
37        "a=rtpmap:96 VP8/90000",
38        "a=rtcp-fb:96 goog-remb",
39        "a=rtcp-fb:96 transport-cc",
40        "a=rtcp-fb:96 ccm fir",
41        "a=rtcp-fb:96 nack",
42        "a=rtcp-fb:96 nack pli",
43 
44        "a=rtpmap:97 rtx/90000",
45        "a=fmtp:97 apt=96",
46 
47pt 127 + 121
48 
49        "a=rtpmap:127 H264/90000",
50        "a=rtcp-fb:127 goog-remb",
51        "a=rtcp-fb:127 transport-cc",
52        "a=rtcp-fb:127 ccm fir",
53        "a=rtcp-fb:127 nack",
54        "a=rtcp-fb:127 nack pli",
55        "a=fmtp:127 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f",
56 
57        "a=rtpmap:121 rtx/90000",
58        "a=fmtp:121 apt=127",
59 
60pt 125 + 107
61 
62        "a=rtpmap:125 H264/90000",
63        "a=rtcp-fb:125 goog-remb",
64        "a=rtcp-fb:125 transport-cc",
65        "a=rtcp-fb:125 ccm fir",
66        "a=rtcp-fb:125 nack",
67        "a=rtcp-fb:125 nack pli",
68        "a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f",
69 
70        "a=rtpmap:107 rtx/90000",
71        "a=fmtp:107 apt=125",
72 
73pt 108 + 109
74 
75        "a=rtpmap:108 H264/90000",
76        "a=rtcp-fb:108 goog-remb",
77        "a=rtcp-fb:108 transport-cc",
78        "a=rtcp-fb:108 ccm fir",
79        "a=rtcp-fb:108 nack",
80        "a=rtcp-fb:108 nack pli",
81        "a=fmtp:108 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f",
82 
83        "a=rtpmap:109 rtx/90000",
84        "a=fmtp:109 apt=108",
85 
86pt 124 + 120
87 
88        "a=rtpmap:124 H264/90000",
89        "a=rtcp-fb:124 goog-remb",
90        "a=rtcp-fb:124 transport-cc",
91        "a=rtcp-fb:124 ccm fir",
92        "a=rtcp-fb:124 nack",
93        "a=rtcp-fb:124 nack pli",
94        "a=fmtp:124 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f",
95 
96        "a=rtpmap:120 rtx/90000",
97        "a=fmtp:120 apt=124",
98 
99pt 123 + 119
100 
101        "a=rtpmap:123 H264/90000",
102        "a=rtcp-fb:123 goog-remb",
103        "a=rtcp-fb:123 transport-cc",
104        "a=rtcp-fb:123 ccm fir",
105        "a=rtcp-fb:123 nack",
106        "a=rtcp-fb:123 nack pli",
107        "a=fmtp:123 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d001f",
108 
109        "a=rtpmap:119 rtx/90000",
110        "a=fmtp:119 apt=123",
111 
112pt 35 + 36
113 
114        "a=rtpmap:35 H264/90000",
115        "a=rtcp-fb:35 goog-remb",
116        "a=rtcp-fb:35 transport-cc",
117        "a=rtcp-fb:35 ccm fir",
118        "a=rtcp-fb:35 nack",
119        "a=rtcp-fb:35 nack pli",
120        "a=fmtp:35 level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=4d001f",
121 
122        "a=rtpmap:36 rtx/90000",
123        "a=fmtp:36 apt=35",
124 
125pt 114 + 115
126 
127        "a=rtpmap:114 H264/90000",
128        "a=rtcp-fb:114 goog-remb",
129        "a=rtcp-fb:114 transport-cc",
130        "a=rtcp-fb:114 ccm fir",
131        "a=rtcp-fb:114 nack",
132        "a=rtcp-fb:114 nack pli",
133        "a=fmtp:114 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=64001f",
134 
135        "a=rtpmap:115 rtx/90000",
136        "a=fmtp:115 apt=114",
137 
138 
139pt 41 + 42
140 
141        "a=rtpmap:41 AV1/90000",
142        "a=rtcp-fb:41 goog-remb",
143        "a=rtcp-fb:41 transport-cc",
144        "a=rtcp-fb:41 ccm fir",
145        "a=rtcp-fb:41 nack",
146        "a=rtcp-fb:41 nack pli",
147 
148        "a=rtpmap:42 rtx/90000",
149        "a=fmtp:42 apt=41",
150 
151pt 98 + 99
152 
153        "a=rtpmap:98 VP9/90000",
154        "a=rtcp-fb:98 goog-remb",
155        "a=rtcp-fb:98 transport-cc",
156        "a=rtcp-fb:98 ccm fir",
157        "a=rtcp-fb:98 nack",
158        "a=rtcp-fb:98 nack pli",
159        "a=fmtp:98 profile-id=0",
160 
161        "a=rtpmap:99 rtx/90000",
162        "a=fmtp:99 apt=98",
163 
164pt 100 + 101
165 
166        "a=rtpmap:100 VP9/90000",
167        "a=rtcp-fb:100 goog-remb",
168        "a=rtcp-fb:100 transport-cc",
169        "a=rtcp-fb:100 ccm fir",
170        "a=rtcp-fb:100 nack",
171        "a=rtcp-fb:100 nack pli",
172        "a=fmtp:100 profile-id=2",
173 
174        "a=rtpmap:101 rtx/90000",
175        "a=fmtp:101 apt=100",
176 
177pt 116 + 117
178 
179        "a=rtpmap:116 red/90000",
180 
181        "a=rtpmap:117 rtx/90000",
182        "a=fmtp:117 apt=116",
183 
184pt 118
185 
186        "a=rtpmap:118 ulpfec/90000",