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Output Statistics

The following tables list the Streaming Output statistics:


Scroll down for SRT graphical statistics example.


Output Statistic



The current operating status of the stream, either:


Up Time

(only available when State is STREAMING) The length of time the stream is actively streaming (e.g., 1d22h5m41s).

Source Port

The UDP source port for the RTP or UDP stream, i.e., the port from which the encoder is sending the stream. 

Sent PacketsNumber of RTP or UDP packets sent for that stream.
Sent BytesNumber of Bytes sent for that stream.
Unsent PacketsNumber of RTP or UDP packets not sent for that stream.
Unsent BytesNumber of Bytes not sent for that stream.
Last ErrorThe last logged error (number and description).
OccurredThe time at which the last error was logged (i.e., how long ago).
BitrateThe stream bitrate (in kbps).


Click to reset the Output statistics.


SRT Statistic


Path(Redundant connections only) Descriptive path names (if assigned), or Path 1 and Path 2.
StateThe current operating status of the stream or redundant connections, for example, STREAMING, STOPPED, or PAUSED.
Peer Version(Redundant connections only) The SRT version used for the connections.
ReconnectionsThe number of reconnections since the stream started. Severe network congestion may cause the connection to drop and automatically reconnect.
Source Port

The UDP source port for the SRT stream or redundant connections, i.e., the port from which the encoder is sending the stream. 

AES EncryptionIndicates whether Advanced Encryption Standard (AES) encryption has been enabled.
Key LengthThe key length for AES encryption, either: None, AES-128, or AES-256
Resent PacketsThe number of packets retransmitted following a lost report from the decoder.
Resent BytesTotal bytes of the lost packets retransmitted.
Dropped PacketsThe number of dropped packets.
Dropped BytesThe number of dropped bytes.
Received ACKs

Transmission progress acknowledgement and feedback.

Received NAKsLost packet reports.
Max BandwidthMaximum bandwidth (input stream rate * (1 + overhead)).
Path Max BandwidthEstimated link bandwidth. This can change due to cross traffic.

(Maximum Transmission Unit) The maximum allowed size of IP packets for the outgoing RTP data stream.

RTTMeasured Round Trip Time.
Local Buffer Level

Encoder buffers in milliseconds. SRT encoder buffers are unacknowledged stream packets (reception not confirmed by the receiver/decoder). The encoder buffer in absence of congestion or packet lost is around the RTT value. In presence of recoverable packets lost, the value should be between the RTT and Latency. Encoder buffers above Latency will most probably have an impact on the decoder and affect the user's experience.


If the Buffer goes to or above the Latency value often, then there is most likely insufficient bandwidth to support the desired bitrate. In this case, decrease your bitrate.

If the Buffer occasionally goes to or above the Latency Value, then the SRT Latency should be increased.


Maximum of the decoder and encoder configured in (Buffering) Latency. For example:

Encoder Configured SRT Latency = 750
Decoder Configured SRT Latency = 20

The SRT Stats Latency (which is the current SRT connection applied Buffering Latency) = 750 (largest of the two).

At startup, handshake exchanges the value configured on both sides and the largest one is selected.

The decoder default is set to the minimum (20ms) so it can be completely controlled from the other side.

SRT streams include a graphical statistics display as shown in the following example of redundant transport paths:
SRT Graphical Statistics Example


The Link Bandwidth is an estimate of the actual link bandwidth.

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