VT Receiver

A guide to receiving streams via VT Receiver.

VT Receiver is a Windows app designed to receive feeds from VT Publisher, VT Guest. VT Receiver can make feeds available as an NDI® source, play out to a hardware device (Windows Audio, ASIO, SDI) or create a virtual source in MPLink format.

Receiving feeds

Select one of the available sources in the "Source" tab (6).
Once selected, the preview of the feed will soon start to play.
Select desired latency in the "Buffer" tab (11).
Select the output method in the "Output" tab (NDI®, a hardware device, or a virtual device) and hit "Start Output" (16).

Using VT Receiver

Here's what VT Receiver looks like.

Most of the following settings require a restart of the VT Receiver application.

Source settings window

Latency configuration

There are several principal latency settings in Video Transport:

Real-time. In good conditions, the technology is capable of bringing latency down to 50-100 ms. When using this option, make sure your network is good and stable – network issues will cause frame drops. Use Ultra-low if you want a compromise between reliability and latency on good connections.
Low. If reliability is more important than latency, increase the buffer. More latency gives our protocol more time for error correction (to resend the missing frames and restore the image). Use Reliable for predictable reliability even on low-quality connections.
Fixed. Depending on the quality of your network, you can choose one of the fixed buffer settings. This is the recommended mode for remote multi-camera production since it allows for several sources to arrive at the same time. Also to be used in creative scenarios, such as a group of musicians jamming together).

Possible values:

What is Latency(RTT)?

As you probably already saw Latency in the VT Receiver is represented by two different values in milliseconds.

The first value called Latency is the actual time in milliseconds that is required to send the stream from the VT Publisher and receive it into the VT Receiver. This time includes network transport between locations (RTT), decoding process in the VT Receiver, and buffering process in the VT Receiver.

The second value that you can see in the round brackets is the RTT (Round-trip time). In short, RTT is the time required for a packet to travel from the VT Publisher to the VT Receiver and back again. Actually, you can measure your network quality with that value.