VT Publisher

A guide to using VT Publisher and its features.

VT Publisher is the app that is run on the sending side. It supports the following input options:

  • NDI;

  • SDI or HDMI sources via Blackmagic, AJA, Magewell or Bluefish;

  • Generic video devices, such as web cams (via DirectShow).

Publishing feeds

First, check that the current version of VT Publisher is the same or newer than the latest release version. If not, click the "Update" button to download the latest release.

  1. Select the source you wish to publish from the list of available sources (5). Once selected, the preview of the source will start and it's parameters will be shown (6).

  2. Copy the Publisher ID (4) and send it to the receiving side (to paste in VT Receiver). You can use the same Publisher ID on multiple instances of VT Publisher and VT Receiver.

  3. You can set a custom name for this particular instance of VT Publisher via the "Location" field – to make it easier to locate this feed in VT Receiver.

  4. To start publishing, choose the desired bitrate (7) and hit "Start Publishing" (11).

  5. Once the stream has been started, the URL appears in the "URL" tab (8). One can open this URL in a browser to receive a high-quality WebRTC preview of this feed.

Using VT Publisher

Here's what it looks like.

The VT Publisher UI.




The current version of the Video Transport software, the license count in your current license, its validity date and the latest release version.


A link to download the latest release version of Video Transport.


The current location, where VT Publisher is run. It is possible to assign your own names to locations (such as "MCR").


The Publisher ID – your unique identifier, provides access to all feeds published under this ID. The Publisher ID is hardwired into your license and cannot be changed.


NDI® and other video sources available on this computer. Check in on supported hardware to see what I/O devices VT is compatible with.


Current streaming parameters: video format, number of audio channels, frame rate and number of receivers.


Bitrate settings: target bitrate (the maximum bandwidth you want this stream to use); current bitrate (bandwidth currently used) and maximum available bandwidth (estimated available bandwidth).


The URL of The Web Preview page for this stream. Copy and paste to view in the browser.


Adds network streams (UDP, RTMP, or IP camera) as a source for publishing. Follow the instructions below.


Removes the selected source from the list: stops publishing and re-initializes the video source. Once removed, the source will instantly re-appear in the list.


Controls to start and stop publishing of a particular stream.


Controls to enable full-screen preview on connected monitors.


Mute control for the audio preview.


Encoding stats: current protocol (WebRTC or SRT), bitrate (Mbps), video codec, and FPS performance (value has to be higher than the stream's FPS).

Adding network streams as sources

VT Publisher can also use RTMP, RTMPS, UDP, and HLS streams as sources.

Hit "Add URL" and paste the streaming link into the field below. Add parameters into the respective field to define extra settings.

Adding external audio to video source

It's possible to add external audio to any video source.

You can select External Audio device in the source settings window. The external audio channels will be added after the original audio. If your original audio have 2 audio channels and external audio also have 2 audio channels, the video stream will contain 4 audio channels in total (2 original video audio + 2 external audio). You can use Audio Channels Mask setting to keep only External audio in the stream, in the example above External audio is on channels 3 and 4 and using "3,4" as Audio Channels Mask will be keep only two audio channels from External audio source.