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Delay

The Delay section provides a graphical overview of how the SRT stream buffers are handling the traffic.

Makito X4 Encoder (SRT source device)

Makito X4 Decoder (SRT destination device)

SrcDestParameterDescription
Last X MinutesChoose a time frame (5 minutes, 60 minutes, or 24 hours) for the data to be displayed in the DELAYS and BANDWIDTH USED graphs.
Download CSV fileClick to download a CSV file.

Encoder Send BufferCheck this box to view a plot of the contents (in ms) of the encoder buffer over time (purple line in the graph).

Decoder Receive BufferCheck this box to view a plot of the contents (in ms) of the decoder buffer over time (purple line in the graph).
Round Trip TimeCheck this box to view a plot of the RTT value over time (white line in the graph).
LatencyCheck this box to view a plot of the Latency value over time (yellow line in the graph).

What to look for:

  • The value for Buffer (purple line) on the source device should normally not exceed the Latency value (yellow line). If the Encoder Send Buffer spikes above the latency line, then increase the SRT Latency. You may see occasional spikes (with corresponding anomalies in the display). But if these are few and far between, and the impact on the display of the stream is tolerable, you may choose to ignore these spikes as you tune the stream parameters.
  • Ideally, the destination device buffer level should be just below the latency value. If the Decoder Receive Buffer goes to 0 often, then there is most likely insufficient BW to support the desired bitrate (which should therefore be lowered). If the Decoder Receive Buffer only occasionally goes to 0, then the SRT Latency should be increased.
  • On the source device, if the Encoder Send Buffer often reaches or exceeds the Latency value, then there is most likely insufficient bandwidth to support the desired bitrate (which should therefore be lowered). If the Encoder Send Buffer only occasionally goes to or above the Latency value, then the SRT Latency should be increased.
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