Properties reference

VT Publisher manager properties (Global settings)

Name	Format / Value example	Description	Publisher Global Settings equivalent
vt20:webrtc	true / false	New WebRTC implementation for the Web Preview and Web Guests. On by default.	VT 2.0 WebRTC mode
vt20:ice_port_range	integer	Allows you to set custom port range for ICE (p2p) connection between Publisher and Receiver	VT 2.0 SRT/WebRTC port range (min-max)
vt20:connect.gateways_filter	"+xxx.xxx.xxx.xxx:7777"	Use this prop to alter the VT SRT Gateways list. You can use ip address and port 7777	VT 2.0 gateways filtering (e.g. for custom routes)
runtime:gpu_pipeline	true / false	Enable gpu_pipeline mode if you using the BMD cards and 10bit feature. In other cases, it is not recommended to use it.	Turn on gpu_pipline (required for 10bit feature)
device:bmd.10bit	true / false	Set this prop to TRUE to capture 10 bit video. This feature is only supported on Blackmagic Design devices.	Capture 10bit video (BMD cards only)
device:bmd.444	true / false	Set this prop to TRUE to capture 4:4:4 video. This feature is only supported on Blackmagic Design devices.	Capture 4:4:4 video (BMD cards only)
asio.split_audio_channels	integer with commas	Split one ASIO audio device to many by the mask. Mask is applied for each device simultaneously. Format: X,X,X,.... Where X is the number of channels assigned from real device to split. For example, you have a device with the channels:0,1,2,3,4,5,6,7 - 7 in total. So if you set the Split audio channels=3,2,3 VT will create 3 audio devices with channels from the original device - 0,1,2; 3,4; 5,6,7	Split audio channels (ASIO devices only)
webrtc:venc_srt_props:output.444	true / false	Enable this prop to encode the 4:4:4 video.	Encode 4:4:4 video
webrtc:venc_srt_props:encoder.quicksync	true / false	If you enable this prop VT Publisher will use the QS265/264 encoder if your NVIDIA GPU reached the limit for encoding sessions. It should work for H265/H264 encoders. Works only with Intel CPU with an integrated HD graphics. Currently in beta.	Use Quicksync encoder
vt20:connect.timeout	integer	Sets the timeout for the connection to signaling server. By default it is set to 5000 ms.	Set the timeout for connection (in milliseconds)
screen_capture:capture.audio_device	microphone / PC Sounds (Loopback)	Selects audio source to use with a screen capture feed	Audio source for screen capture
screen_capture:capture.frame_size	1280x720 / 1920x1080 / …	Sets the resolution of screen capture feed	Screen capture resolution
screen_capture:capture.fps_limit	example: 30.0, 60.0	Sets the screen capture frame rate in frames per second	Screen capture frame rate
screen_capture:capture.show_mouse	show / hide	Selects show or hide cursor on the screen capture video	Show cursor on the screen capture video
screen_capture:capture.highlight_mouse	show / hide	If set to show , highlights mouse cursor with yellow circle	Show mouse highlight on the screen capture video
screen_capture:capture.show_clicks	true / false	If true it will show animation if mouse clicked	Animate clicks on screen capture video
preview:preview.type	dx9 / dx11	Here you can select render API for the native in-app Preview Window	Set the preview type
preview:overlay_rms	true / false	Enable this to add RMS audio meters overlay on the preview to observe the sound levels.	Show RMS audio meters on preview
webrtc:venc_srt_props:preset	high_performance / high_quality	Sets the preset for NVIDIA encoder: High Quality or High Perfomance	Set the preset for Nvidia encoder
vt20:connect.ice	true / false	Enable or disable P2P connectivity (ICE)	VT 2.0 P2P Connect Enabled
audio.list_input_sources	true / false	If TRUE shows the list of local audio input devices in the VT Publisher sources list along with video devices	Show local audio input devices

VT Publisher channel properties (Source settings)

Name	Format / Value example	Description	Publisher Source Settings equivalent
channel_label	textbox	Sets the channels name, requires republish.	Channel Label (require republish)
webrtc:vt_tunnel.default	example: tcp://ip_address:port	Sets the address for UDP/TCP tunneling feature.	UDP/TCP Tunnel address
webrtc:venc_srt_props:codec	GPU_H265 / GPU_H264 / CPU_H264	Here you can select the desirable encoder for your stream from: GPU_H265, GPU_H264, CPU_H264. If you have a proper NVIDIA GPU we recommend you to use GPU_H265. In case if you don't have an NVIDIA GPU, better option is to use CPU encoding, but it will requires powerfull CPU.	SRT Default Encoder
device:virtual_source.enabled	true / false	Not working, will be deprecated.Creates a virtual device that replicates the original source and names it with the prefix "VT". For example you need to publish your USB Web Camera, but need to be on call via Google Meet at the same time. This setting will allow you to do this.	Create Virtual Device for video source
format.input	example: YUY2 640x480@25.00p 4:3 / …	Sets source video format. Auto by default. If Auto not working set this manually from the list.	Source Video Format
external_audio	example: PC Sounds (Loopback)	Select external audio device	External Audio
vt20:connect.public_port	textbox	Here you can manually set the ICE connection port for VT Publisher	SRT Publisher Port
webrtc:audio_bitrate	example: 320K	Sets the audio bitrate for the source feed (per each 2 channels)	SRT Audio Bitrate per stereo-pair
audio_channels_mask	example: 1,2	Here you can set the audio channels which you wish to publish with the source. For example: 1,2,5,6 means that you selected channels 1,2,5,6 and only those channels will be heard in the stream.	Audio Channels Mask
audio_gain	integer	Applies audio gain to source audio tracks.	Audio Gain
web_preview:mix_minus.enabled	true / false	Automatic mix-minus for the Web Guests.	Web Guest Mix-Minus enabled
web_preview:mix_minus.src_channels	integer	Sets the channels that Web Guests will hear in mix-minus	Web Guest Mix-Minus channels mask
web_preview:mix_minus.delay_msec	integer	Delay for Mix-Minus. Default is 50 msec. You can raise up this value in case of crackling audio problems.Web Guest Mix Minus Delay - it's web guest audio delay time which is going to be used during the mix munus processing, by default 50 ms, so all remote peers will hearing another remote peers audio with that delay	Web Guest Mix-Minus delay msec
web_preview:webrtc.external_decoder.h264	true / false	Use the GPU decoding on Web Guest side if available. Improves perfomance and quality of the incoming stream on the Web Guests side.	Web Guest GPU H.264 decoder
web_preview:video_encoder	VP9 / CPU_H264 / GPU_H264	Select the encoder from the drop down list. GPU H264 is recommended option when you have an powerful NVIDIA GPU, because it encodes one time for all viewers. Other options are: VP9, CPU H264.	Web Preview & Guest video encoder
web_preview:video_bitrate	example: 1.5M / 5.0M / …	Sets the bitrate for the Web Preview&Guest encoder in Megabits per second	Web Preview & Guest Max output feed bitrate
web_preview:max_width	example: 1920	Sets feed maximum width resolution for the Web apps	Web Preview & Guest output feed max width
web_preview:max_height	example: 1080	Sets feed maximum height resolution for the Web apps	Web Preview & Guest output feed max height
video	true / false	Audio Only feed	Output Video Enabled
audio	true / false	Video Only feed	Output Audio Enabled
vt20:connect.gateways_filter	"+xxx.xxx.xxx.xxx:7777"	Use this prop to alter the VT SRT Gateways list. You can use ip address and port 7777. In Receiver this field should be empty by default.	VT 2.0 gateways filtering (e.g. for custom routes)
vt20:ice_port_range	integer – integer	Allows you to set custom port range for ICE (p2p) connection between VT Publisher and Receiver	VT 2.0 SRT/WebRTC port range (min-max)
channel_name.show_location	true / false	Adds the VT Publisher's location name to the source name in the list.	Show location in channel name
runtime:gpu_pipeline	true / false	Enable this switch if you want to receive a video feed in 10bit. Disabled by default.	Turn on gpu_pipline (required for 10bit feature)
webrtc:login_timeout	integer	Sets the maximum amount of time needed to establish a connection between your VT Receiver and a signaling server. Default value is "3000" (milliseconds).	Set the timeout for connection (in milliseconds)
webrtc:decoder.output.10bit	true / false	Enables the 10bit video output feature. Requires gpu_pipeline setting. False by default.	Allow to output 10bit video
preview:preview.type	dx9 / dx11	Here you can select render API for the native in-app Preview Window. Options are dx11, dx9 and dshow. Default value is is "dx11"	Set the preview type
preview:overlay_rms	true / false	Enable this to add RMS audio meters overlay on the preview to observe the sound levels. "False" by default.	Add RMS audio meters on preview
vt20:connect.ice	true / false	Allows you to enable or disable P2P connection	VT 2.0 P2P Connect Enabled
asio.split_audio_channels	Integer , integer …	Split one ASIO audio device to many by the mask. Mask is applied for each device simultaneously. Format: X,X,X,.... Where X is the number of channels assigned from real device to split. For example, you have a device with the channels:0,1,2,3,4,5,6,7 - 7 in total. So if you set the Split audio channels=3,2,3 VT will create 3 audio devices with channels from the original device - 0,1,2; 3,4; 5,6,7	Split audio channels (ASIO devices only)
access_id	string	Value contains the Access_ID for the stream. You can GET it. But it generated automatically. So if you try to SET it when you restart the stream it will be reset to new automatically generated value.
webpreview_permanent_id	string	Value contains the Web PreviewURL for the stream. You can GET it. But it generated automatically. So if you try to SET it when you restart the stream it will be reset to new automatically generated value.

VT Publisher security settings properties

Name	Format / Value example	Description	Security Settings equivalent
auth::enabled	true / false	Allow anonymous access. False – Anonymous access True – Only users from pre-created user list are allowed	Allow anonymous access
active	true / false	If False - user account is not active and not alllowed to see and participate in this feed, True - user account is active and allowed to see and participate.	Active
guest_password	string	Sets access password for selected user account	Password
con_limit	integer	Number of maximum connections from this account	Connections Limit
start_time	datetime format yyyy/mm/dd hh-mm-ss	Time from when account is allowed to access the feed.	Start Time
exp_time	datetime format yyyy/mm/dd hh-mm-ss	Time from when account can't access the feed.	Expiration Time

To create the Security Settings User account, set Channel Props:

1. Name: auth:: (for example auth::guest_from_sample)

2. Value: guest_password='password' con_limit='number' start_time='yyyy/mm/dd hh:mm:ss' exp_time='yyyy/mm/dd hh:mm:ss' active='true / false' (for example guest_password='123' con_limit='1' start_time='2022/05/16 18:31:00' exp_time='2022/05/16 21:31:00' active='true')

VT Receiver manager properties (Global settings)

Name	Format / Value example	Description	Receiver Global Settings equivalent
vt20:connect.gateways_filter	"+xxx.xxx.xxx.xxx:7777"	Use this prop to alter the VT SRT Gateways list. You can use ip address and port 7777. In Receiver this field should be empty by default.	VT 2.0 gateways filtering (e.g. for custom routes)
vt20:ice_port_range	integer – integer	Allows you to set custom port range for ICE (p2p) connection between VT Publisher and Receiver	VT 2.0 SRT/WebRTC port range (min-max)
channel_name.show_location	true / false	Adds the VT Publisher's location name to the source name in the list.	Show location in channel name
runtime:gpu_pipeline	true / false	Enable this switch if you want to receive a video feed in 10bit. Disabled by default.	Turn on gpu_pipline (required for 10bit feature)
webrtc:login_timeout	integer	Sets the maximum amount of time needed to establish a connection between your VT Receiver and a signaling server. Default value is "3000" (milliseconds).	Set the timeout for connection (in milliseconds)
webrtc:decoder.output.10bit	true / false	Enables the 10bit video output feature. Requires gpu_pipeline setting. False by default.	Allow to output 10bit video
preview:preview.type	dx9 / dx11	Here you can select render API for the native in-app Preview Window. Options are dx11, dx9 and dshow. Default value is is "dx11"	Set the preview type
preview:overlay_rms	true / false	Enable this to add RMS audio meters overlay on the preview to observe the sound levels. "False" by default.	Add RMS audio meters on preview
vt20:connect.ice	true / false	Allows you to enable or disable P2P connection	VT 2.0 P2P Connect Enabled
asio.split_audio_channels	Integer , integer …	Split one ASIO audio device to many by the mask. Mask is applied for each device simultaneously. Format: X,X,X,.... Where X is the number of channels assigned from real device to split. For example, you have a device with the channels:0,1,2,3,4,5,6,7 - 7 in total. So if you set the Split audio channels=3,2,3 VT will create 3 audio devices with channels from the original device - 0,1,2; 3,4; 5,6,7	Split audio channels (ASIO devices only)

VT Receiver channel properties (Source settings)

Web Guest Remote settings properties