vp9 and nack/rtx

[cpet...@broadsoft.com]

Am I safe to assume any form of nack/ rtx for vp9 is not yet supported?

std::vector<VideoCodec> DefaultVideoCodecList() {

  std::vector<VideoCodec> codecs;

  codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultVp8PlType,

                                                           kVp8CodecName));

  if (CodecIsInternallySupported(kVp9CodecName)) {

    codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultVp9PlType,

                                                             kVp9CodecName));

    // TODO(andresp): Add rtx codec for vp9 and verify it works.

  }

  if (CodecIsInternallySupported(kH264CodecName)) {

    codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultH264PlType,

                                                             kH264CodecName));

  }

  codecs.push_back(

      VideoCodec::CreateRtxCodec(kDefaultRtxVp8PlType, kDefaultVp8PlType));

  codecs.push_back(VideoCodec(kDefaultRedPlType, kRedCodecName));

  codecs.push_back(VideoCodec(kDefaultUlpfecType, kUlpfecCodecName));

  return codecs;

}

[Christoffer Jansson]

+André Susano Pinto could you confirm this? It sure looks like that is the case.

/Chris

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[Stefan Holmer]

We currently don't support RTX with vp9, but we do support NACK, so the retransmissions will be done on the same ssrc as the original media packets.

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[cpet...@broadsoft.com]

I understand. Would the same be true for h264? Firefox supports h264, chrome will soon. Do you expect they will do nack with h264 and do the retransmit with the same ssrc?