System requirements for VT apps

The following hardware is suggested to run VT Publisher, VT Receiver and VT Guest:

• Windows 8.1, 10 or Windows Server 2012, 2016

• Intel i7-4770 CPU or better

• 16 GB of RAM

• .NET Framework v. 4.6.1 or newer

GPU suggestions for VT Publisher

Unlike VT Receiver (receives feeds and decodes them) and VT Guest (receives one feed and encodes one feed), VT Publisher is capable of encoding and sending multiple feeds. Hence, it needs more encoding power.

We recommend Nvidia hardware for optimal performance, for example:

• NVIDIA GeForce GTX 1070 – for up to 2 channels of Full HD 60p video with a bitrate of 30 MB/s

• NVIDIA Quadro M2000 – for up to 4 channels of Full HD 60p video with bitrate 10 MB/s

• NVIDIA Quadro P4000 – for up to 8 channels of Full HD 60p video with a bitrate of 10 MB/s

• NVIDIA GeForce GTX 1060 – for 1 channel of UHD 25p video with a bitrate of 40 MB/s

Here's Nvidia's comparison guide that will help you choose the right model.

I/O hardware

Video Transport is compatible with hardware by Blackmagic Design, AJA and Magewell.

Bandwidth

Our technology currently supports up to 50 Mbps.

If the adaptive bit rate features is enabled, video quality may dynamically decrease if bandwidth is not available.

Allocating hardware

The hardware you'll need to properly use Video Transport depends what will be the function of each machine in your scenario. It's best to allocate separate machines for sending and receiving functions:

1. Sending (or publishing) machines will be running VT Publisher and need to have sufficient encoding power.

2. Receiving machines will be running VT Receiver – these can be lighter machines since their job will be only to decode the incoming streams.

The following codecs are used in Video Transport:

1. H.265 – used with the "SRT-HEVC" streaming mode (requires an Nvidia GPU card);

2. H.264 – used with "WebRTC-AVC" and "SRT-AVC" streaming modes;

3. VP9 – used with WebRTC when used by the web applications.

We recommend using the GPU encoders and decoders because the CPU can't provide the same quality of the video and often do not have sufficient power. There are two possible limitations to keep in mind when selecting the right Nvidia GPU product:

1. The primary limitation of GPU encoding is the count of the simultaneous encoding processes. Most GPU cards have a limitation on two encoding processes. It's true for all GTX and RTX cards. We recommend using the Quadro (starting with P2000), Grid, or Tesla series in scenarios when you want to send more than two streams from one machine.

2. Another limitation is codec support – for example, the Quadro M2000 does not support H.265 and, in case of "SRT-HEVC" mode will automatically switch to CPU encoding.

Here's an Nvidia guide the will help select the best GPU encoder (it will also show how many encoding processes your current Nvidia card supports). For example, you have a P1000 card and want to find out can you encode 3 SRT-HEVC streams with it. Open the table and find P1000 in the NVenc supported matrix part of the table. Find the "Max # of concurrent sessions" and "H265(HEVC) 4K YUV 4:2:0" columns. As we can see P1000 has the "2" and "Yes" values in those columns. So the answer is-yes, P1000 can use the SRT-HEVC protocol but can't encode 3 streams at the same time.

GPU hardware suggestions

Here's some test results (still work in progress) for the most common configurations.

On-prem deployment

If you are deploying Video Transport on your own infrastructure, you will also need to run instances of the signaling and TURN servers. These can be run on your own servers or in a cloud (such as AWS EC2).

The signaling server establishes a handshake between the end points and allows them to establish a direct connection. This server does not need much performance. An HTTP server + a "light" backend i7 should be enough.

The TURN server acts as a proxy (re-streamer) in case the end points can't establish a direct connection (due to firewall settings or network configuration). The load on the TURN server depends on the number of streams it will be re-sending.

The TURN server requires sufficient CPU and RAM for operation. For example, an i9 CPU with 32 GB RAM can handle up to 100 connections via TURN. Also, it is very important that the TURN server has enough network bandwidth.

For OS, we recommend running Ubuntu, a Debian-based Linux build (but other versions of Linux will also work).