[
   {
      "decoders" : [
         {
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               {
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               },
               {
                  "packetization-mode" : "0"
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            ],
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         },
         {
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               },
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                  "packetization-mode" : "1"
               },
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               }
            ],
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         }
      ],
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      "rtp" : {
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         "local_ssrc" : 1,
         "nack" : {
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         },
         "red_payload_type" : 125,
         "remb" : true,
         "remote_ssrc" : 1989790381,
         "rtcp_mode" : "RtcpMode::kReducedSize",
         "rtx_payload_types" : [
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            },
            {
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            },
            {
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            }
         ],
         "rtx_ssrc" : 1406083315,
         "transport_cc" : true,
         "ulpfec_payload_type" : -1
      },
      "target_delay_ms" : 0
   }
]