WHITE PAPER | SRT - A new protocol for low-latency video transport over the internet
SRT TECHNICAL DESCRIPTION
Whenever signals are sent from one location to another, they are subject to bit errors and packet loss. For high performance
video signals, these network faults can lead to significant degradations, even for loss rates that are commonly encountered
in transit across the public internet. Figure 1 shows how severely a sample video signal is degraded by a relatively low
packet loss rate.
Figure 1: This image is divided into four quadrants to illustrate the impact of errors and error correction systems on video signals. The
source video signal is shown in the lower left. The upper left quadrant shows the video degradation caused by a two percent packet loss
rate. The two images on the right half of the illustration show how SRT can eliminate video impairments for two commonly used video
codec at two different bit rates.
Two techniques are commonly used to correct these network faults – Forward Error Correction (FEC) and Automatic
Repeat reQuest (ARQ). Both of these have been used in modern video transmission. Figure 2 shows how both techniques
impact the packet flow over a network connection.
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