This video demonstrates the benefits of the R&S RelayCaster encoder for adaptive live encoding of SDI signals and IP contribution in unmanaged networks, such as the Internet. Even when applying progressively less bandwidth, the adaptive encoding of R&S RelayCaster reduces the encoding bitrate and the stream can received without errors.
This video demonstrates the benefits of RelayCaster Encoder for adaptive live encoding of SDI signals and IP contribution in unmanaged networks, such as the Internet.
In the top, you see the control interface of the network simulator, called WANem. A delay of 50 ms (milliseconds) and a bandwidth limitation of 25.000 Kbps is applied to a stream sent and received with UDP (bottom left) as well as on a stream sent and received with with RelayCaster Streaming Protocol (RCSP). Both streams originate from the same live source provided by SDI.
This SDI signal is encoded in real-time to H.264 and AAC audio at a total bitrate of 12.000 Kbps by RelayCaster Encoder, so the total bandwidth for both streams running through the network simulator is 2 x 12.000 Kbps = 24.000 Kbps, which fits into the available 25.000 Kbps. The network simulator is then set to 5% packet loss rate, meaning 5 out 100 packets are randomly discarded.
The UDP stream immediately shows the result of packet loss, while the RelayCaster stream is 100% error free due to the robust packet repair protocol of RelayCaster. Noticeable is that there is no visible delay between the 'plain' UDP stream and the 100% error free stream as fixed by RelayCaster.
As the next step, the available bandwidth for both streams is reduced from 25.000 Kbps to 18.000 Kbps. This results in additional packet loss since 25% less bandwidth is available than would be required (18.000 Kbps < 24.000 Kbps).
As a result, the artefacts of the UDP stream increase. The RelayCaster streams only shows a short problematic sequence. Then, the adaptive encoding of RelayCaster is applied, the encoding bitrate is reduced and the stream is received again without any errors by RelayCaster.