Overview of collected statistics for VideoSendStream and VideoReceiveStream.
VideoSendStream::Stats for a sending stream can be gathered via VideoSendStream::GetStats().
Some statistics are collected per RTP stream (see StreamStats) and can be of StreamType: kMedia, kRtx, kFlexfec.
Multiple StreamStats objects are for example present if simulcast is used (multiple kMedia objects) or if RTX or FlexFEC is negotiated.
VideoSendStream owns a SendStatisticsProxy which implements VideoStreamEncoderObserver, RtcpStatisticsCallback, ReportBlockDataObserver, RtcpPacketTypeCounterObserver, StreamDataCountersCallback, BitrateStatisticsObserver, FrameCountObserver, SendSideDelayObserver and holds a VideoSendStream::Stats object.
SendStatisticsProxy is called via these interfaces by different components (e.g. RtpRtcp module) to update stats.
type - kMedia, kRtx or kFlexfec.referenced_media_ssrc - only present for type kRtx/kFlexfec. The SSRC for the kMedia stream that retransmissions or FEC is performed for.Updated when a frame has been encoded, VideoStreamEncoder::OnEncodedImage.
frames_encoded - total number of encoded frames.encode_frame_rate - number of encoded frames during the last second.width - width of last encoded frame [rtcoutboundrtpstreamstats-framewidth].height - height of last encoded frame [rtcoutboundrtpstreamstats-frameheight].total_encode_time_ms - total encode time for encoded frames.qp_sum - sum of quantizer values of encoded frames [rtcoutboundrtpstreamstats-qpsum].frame_counts - total number of encoded key/delta frames [rtcoutboundrtpstreamstats-keyframesencoded].Updated when a RTP packet is transmitted to the network, RtpSenderEgress::SendPacket.
rtp_stats - total number of sent bytes/packets.total_bitrate_bps - total bitrate sent in bits per second (over a one second window).retransmit_bitrate_bps - total retransmit bitrate sent in bits per second (over a one second window).avg_delay_ms - average capture-to-send delay for sent packets (over a one second window).max_delay_ms - maximum capture-to-send delay for sent packets (over a one second window).total_packet_send_delay_ms - total capture-to-send delay for sent packets [rtcoutboundrtpstreamstats-totalpacketsenddelay].Updated when an incoming RTCP packet is parsed, RTCPReceiver::ParseCompoundPacket.
rtcp_packet_type_counts - total number of received NACK/FIR/PLI packets [rtcoutboundrtpstreamstats-nackcount, fircount, plicount].Updated when a RTCP report block packet is received, RTCPReceiver::TriggerCallbacksFromRtcpPacket.
rtcp_stats - RTCP report block data.report_block_data - RTCP report block data.std::map<uint32_t, StreamStats> substreams - StreamStats mapped per SSRC.Updated when a frame is received from the source, VideoStreamEncoder::OnFrame.
frames - total number of frames fed to VideoStreamEncoder.input_frame_rate - number of frames fed to VideoStreamEncoder during the last second.frames_dropped_by_congestion_window - total number of dropped frames due to congestion window pushback.frames_dropped_by_encoder_queue - total number of dropped frames due to that the encoder is blocked.Updated if a frame from the source is dropped, VideoStreamEncoder::OnDiscardedFrame.
frames_dropped_by_capturer - total number dropped frames by the source.Updated if a frame is dropped by FrameDropper, VideoStreamEncoder::MaybeEncodeVideoFrame.
frames_dropped_by_rate_limiter - total number of dropped frames to avoid bitrate overuse.Updated (if changed) before a frame is passed to the encoder, VideoStreamEncoder::EncodeVideoFrame.
encoder_implementation_name - name of encoder implementation [rtcoutboundrtpstreamstats-encoderimplementation].Updated after a frame has been encoded, VideoStreamEncoder::OnEncodedImage.
frames_encoded - total number of encoded frames [rtcoutboundrtpstreamstats-framesencoded].encode_frame_rate - number of encoded frames during the last second [rtcoutboundrtpstreamstats-framespersecond].total_encoded_bytes_target - total target frame size in bytes [rtcoutboundrtpstreamstats-totalencodedbytestarget].huge_frames_sent - total number of huge frames sent [rtcoutboundrtpstreamstats-hugeframessent].media_bitrate_bps - the actual bitrate the encoder is producing.avg_encode_time_ms - average encode time for encoded frames.total_encode_time_ms - total encode time for encoded frames [rtcoutboundrtpstreamstats-totalencodetime].frames_dropped_by_encoder- total number of dropped frames by the encoder.Adaptation stats.
bw_limited_resolution - shows if resolution is limited due to restricted bandwidth.cpu_limited_resolution - shows if resolution is limited due to cpu.bw_limited_framerate - shows if framerate is limited due to restricted bandwidth.cpu_limited_framerate - shows if framerate is limited due to cpu.quality_limitation_reason - current reason for limiting resolution and/or framerate [rtcoutboundrtpstreamstats-qualitylimitationreason].quality_limitation_durations_ms - total time spent in quality limitation state [rtcoutboundrtpstreamstats-qualitylimitationdurations].quality_limitation_resolution_changes - total number of times that resolution has changed due to quality limitation [rtcoutboundrtpstreamstats-qualitylimitationresolutionchanges].number_of_cpu_adapt_changes - total number of times resolution/framerate has changed due to cpu limitation.number_of_quality_adapt_changes - total number of times resolution/framerate has changed due to quality limitation.Updated when the encoder is configured, VideoStreamEncoder::ReconfigureEncoder.
content_type - configured content type (UNSPECIFIED/SCREENSHARE).Updated when the available bitrate changes, VideoSendStreamImpl::OnBitrateUpdated.
target_media_bitrate_bps - the bitrate the encoder is configured to use.suspended - shows if video is suspended due to zero target bitrate.VideoReceiveStream::Stats for a receiving stream can be gathered via VideoReceiveStream::GetStats().
VideoReceiveStream owns a ReceiveStatisticsProxy which implements VCMReceiveStatisticsCallback, RtcpCnameCallback, RtcpPacketTypeCounterObserver, CallStatsObserver and holds a VideoReceiveStream::Stats object.
ReceiveStatisticsProxy is called via these interfaces by different components (e.g. RtpRtcp module) to update stats.
current_payload_type - current payload type.ssrc - configured SSRC for the received stream.Updated when a complete frame is received, FrameBuffer::InsertFrame.
frame_counts - total number of key/delta frames received [rtcinboundrtpstreamstats-keyframesdecoded].network_frame_rate - number of frames received during the last second.Updated when a frame is ready for decoding, FrameBuffer::GetNextFrame. From VCMTiming:
jitter_buffer_ms - jitter buffer delay in ms.max_decode_ms - the 95th percentile observed decode time within a time window (10 sec).render_delay_ms - render delay in ms.min_playout_delay_ms - minimum playout delay in ms.target_delay_ms - target playout delay in ms. Max(min_playout_delay_ms, jitter_delay_ms + max_decode_ms + render_delay_ms).current_delay_ms - actual playout delay in ms.jitter_buffer_delay_seconds - total jitter buffer delay in seconds [rtcinboundrtpstreamstats-jitterbufferdelay].jitter_buffer_emitted_count - total number of frames that have come out from the jitter buffer [rtcinboundrtpstreamstats-jitterbufferemittedcount].Updated (if changed) after a frame is passed to the decoder, VCMGenericDecoder::Decode.
decoder_implementation_name - name of decoder implementation [rtcinboundrtpstreamstats-decoderimplementation].Updated when a frame is ready for decoding, FrameBuffer::GetNextFrame.
timing_frame_info - timestamps for a full lifetime of a frame.first_frame_received_to_decoded_ms - initial decoding latency between the first arrived frame and the first decoded frame.frames_dropped - total number of dropped frames prior to decoding or if the system is too slow [rtcreceivedrtpstreamstats-framesdropped].Updated after a frame has been decoded, VCMDecodedFrameCallback::Decoded.
frames_decoded - total number of decoded frames [rtcinboundrtpstreamstats-framesdecoded].decode_frame_rate - number of decoded frames during the last second [rtcinboundrtpstreamstats-framespersecond].decode_ms - time to decode last frame in ms.total_decode_time_ms - total decode time for decoded frames [rtcinboundrtpstreamstats-totaldecodetime].qp_sum - sum of quantizer values of decoded frames [rtcinboundrtpstreamstats-qpsum].content_type - content type (UNSPECIFIED/SCREENSHARE).interframe_delay_max_ms - max inter-frame delay within a time window between decoded frames.Updated before a frame is sent to the renderer, VideoReceiveStream2::OnFrame.
frames_rendered - total number of rendered frames.render_frame_rate - number of rendered frames during the last second.width - width of last frame fed to renderer [rtcinboundrtpstreamstats-framewidth].height - height of last frame fed to renderer [rtcinboundrtpstreamstats-frameheight].estimated_playout_ntp_timestamp_ms - estimated playout NTP timestamp [rtcinboundrtpstreamstats-estimatedplayouttimestamp].sync_offset_ms - NTP timestamp difference between the last played out audio and video frame.freeze_count - total number of detected freezes.pause_count - total number of detected pauses.total_freezes_duration_ms - total duration of freezes in ms.total_pauses_duration_ms - total duration of pauses in ms.total_inter_frame_delay - sum of inter-frame delay in seconds between rendered frames [rtcinboundrtpstreamstats-totalinterframedelay].total_squared_inter_frame_delay - sum of squared inter-frame delays in seconds between rendered frames [rtcinboundrtpstreamstats-totalsquaredinterframedelay].ReceiveStatisticsImpl::OnRtpPacket is updated for received RTP packets. From ReceiveStatistics:
total_bitrate_bps - incoming bitrate in bps.rtp_stats - RTP statistics for the received stream.Updated when a RTCP packet is sent, RTCPSender::ComputeCompoundRTCPPacket.