实例化RTCRtpParametersImpl时没有初始化rtp_parameters_

[Meonardo]

Hi, I could not set the encoding params successfully, sender->set_parameters(p) always return false here the code what I am using to set the encoding params:

void ApplyBitrateSettings() {
  auto senders = pc_->senders();
  for (int i = 0; i < senders.size(); i++) {
    auto sender = senders[i];
    auto sender_track = sender->track();
    if (sender_track == nullptr)
      return;

    if (sender_track->kind().std_string() == "video") {
      auto vec = sender->parameters()->encodings().std_vector();
      if (!vec.empty()) {
        auto p = vec.front();
        p->set_min_bitrate_bps(1000 * 1000 * 2);
        p->set_max_bitrate_bps(1000 * 1000 * 4);
      } else {
        auto p = RTCRtpEncodingParameters::Create();
        p1->set_min_bitrate_bps(1000 * 1000 * 2);
        p1->set_max_bitrate_bps(1000 * 1000 * 4);
        vec.push_back(p1);
      }

      auto p = sender->parameters();
      p->set_encodings(vec);
      bool success = sender->set_parameters(p);
      std::cout << "Update RTCRTPEncodingParameter result: " << success
                << std::endl;
      break;
    }
  }
}

I call ApplyBitrateSettings() after I set local sdp successfully.

Could you take a look? thanks.

[zjzhang-cn]

Sender cannot be in stop state