Use Return Video on a Prism encoder to decode an inbound stream and output it over SDI/HDMI for monitoring. After you activate the Return Video License, choose an Ingest Mode (TRT, SRT, MPEG-TS, RIST, RTSP, RTMP, WHEP, File, or URL), set buffer lengths for stability, and configure video/audio outputs to match your setup.
NOTE: Decoder functionality on the encoder requires a license.
Ingest Settings
-
Return Video - enables the Prism device to produce a secondary output.
- Decoder Mode - Enable or Disable Decoder SDI loop out
- Monitor Video Source - Set the attached monitor's video input to either the device's selected input (SDI/HDMI) or the device's SDI output.
-
Ingest Mode - Selects which protocol is used for ingest.
- MPEG TS
- SRT
- TRT
- RIST
- RTSP
- RTMP
- File Playback
- Generic Streaming URL
- WHEP (Beta)
-
Ingest Settings
- Buffer Length - The amount of video (in ms) stored before decode. This allows the decoder to absorb packet loss or slowness.
- Max Buffer Length - If the video stops due to packets not arriving, this value is the maximum amount of video storage the decoder can dynamically increase to, to overcome latency.
MPEG TS
-
Protocol (default: TCP)
- TCP - Listens for video on a specific port using a TCP connection
- TCP Pull - Pulls video from a specific IP address using a TCP connection
- UDP - Listens for video on a specific port using a UDP connection
- Multicast - Pulls video from a multicast address (LAN) and port.
NOTE: Your network must be setup to handle multicast traffic.
SRT
-
Connection Type - (default: caller)
- Caller - Decoder initiates the connection to the specified IP address
- Listener - Decoder listens for the stream
- Rendezvous - Both decoder and encoder attempt to connect to each other
- Host - Caller and Rendezvous only - IP address or DNS entry that the decoder will attempt to make contact with.
- Port - Port that the decoder will attempt call or listen on. Call is outbound. Listen is inbound.
- Stream ID- A customizable identifier that allows routing and identification of individual SRT streams within a single connection or address, often used to direct streams to specific applications or destinations.
- Encryption - Turns on the option for Encryption
- Passphrase - Sets the passphrase (salt) for the encryption key
- Encryption Key Size (default: 128 bits) - sets the size of the encryption key. Values correspond to 16/24/32 bytes.
- Latency (default: 500) - The buffering delay introduced to counteract network instability, ensuring smooth, reliable streaming by accommodating packet loss and jitter before reaching the decoder
RIST
Teradek is part of the RIST alliance
-
Connection Type (default: Client)
- Client - Decoder initiates the connection to the specified IP address
- Server - Decoder listens for the stream
- Host - Client mode only - IP address or DNS entry that the decoder will attempt to make contact with.
- Port (Client or Server) - Port that the decoder will attempt initiate or listen on. Client is outbound. Server is inbound.
- Encryption (Default: off)- Turns on the option for Encryption
- Passphrase - Sets the passphrase (salt) for the encryption key
- Encryption Key Size (default: 128 bits) - Sets the size of the encryption key. 128 bits or 256 bits
- Canonical Name - Uniquely identifies a device or endpoint in a network, helping distinguish between multiple sources and destinations within a RIST session
RTSP
- Host - IP address or DNS entry that the decoder will attempt to make contact with.
- RTSP Server Port - Port that the decoder will attempt to call. Call is outbound.
- Stream Name - a unique identifier for a specific media stream on a server
- Authentication - Activates the username and password fields for password-protected streams
RTMP
Teradek is part of the RIST alliance
-
Connection Type (default: Client)
- Client - Decoder initiates the connection to the specified IP address
- Server - Acts as an RTMP server - Decoder listens for the stream
- Host - Client mode only - IP address or DNS entry that the decoder will attempt to make contact with.
- Port (Client or Server - default: 1935) - Port that the decoder will attempt initiate or listen on. Client is outbound. Server is inbound.
- App-Name - specifies the application or virtual directory on the streaming server that the client connects to
- Stream Key - unique identifier provided by the streaming platform to authenticate and link a live broadcast
- Authentication - Activates the username and password fields for password-protected streams
File Playback
Allows files stored on SD card to be played back live to SDI or HDMI
- Select File - Selects file from attached media (SD Card, NFS, or NVME) for playback
- Stream Name - a unique identifier for a specific media stream on a server
- Authentication - Activates the username and password fields for password protected streams
Generic Stream URL
The generic stream url is a flexible streaming URL syntax used to decode many different types of video streams (similar to VLC). Supported syntax includes
MPEG TS 'tcp://', 'udp://',
SRT 'srt://',
RIST: 'rist://',
RTMP - 'rtmp://', 'rtmp-pull://', 'rtmp-server://',
RTP / RTSP - 'rtp://', 'rtsp://', 'rtsp-top://','rtsp-udp://', 'rtsp-udp-multi://',
HLS-DASH 'http://'
- Video Stream URL - the url formatted in by protocol and address ie. srt://172.24.100.23:3458
WHEP
WebRTC-HTTP Egress Protocol - Pull based WebRTC over http
- WHEP Stream URL - Selects file from attached media (SD Card, NFS, or NVME) for playback
- Bearer Token - authorization token used to authenticate and grant access to a specific media resource
Video Output Settings
- Output Format - Displays the video resolution for the encoded video.
-
Color Overide - Allows users to override Color Settings on output
- EOTF (default: Default) - defines how digital video signals are translated into luminance on screens, ensuring accurate brightness and color reproduction, especially in HDR content.
- Colorimetry (default: Default) - Default, SDR, SMPTE2084, HLG
- Range - (default: Default) - Legal, Full
Audio Output
Decode Audio (default: TCP) - Enable or Disable
Multi-Track Mode - Enables or disables the multi-track audio configuration (default: disabled).
Multi-Track Mode Disabled:
-
Channel Layout Output - Layout of audio for 5.1/7.1 audio
- SMPTE - Standard broadcast/professional audio channel mapping (L-R-C-LFE-Ls-Rs)
- Film - Cinema-style channel arrangement for theatrical content (L-R-C-LFE-Ls-Rs-Lrs-Rrs)
-
HDMI - Consumer electronics channel layout for HDMI devices (FL-FR-FC-LFE-BL-BR)
- Embedded Output Volume - Master Volume for Track
- Delay - How much delay (in ms) to add to a track.
Multi-Track Mode Enabled:
- Delay - How much delay (in ms) to add to a track.
- Channel Mode (default: 8 Channels) - How many channels to populate on the digital output. 2,4,6,8,16 channels
- Volume Control - Controls volume output and mute for output channels.
-
Channel Settings - Configure how audio tracks and channels are mapped.
- Source Track - Select from Tracks 1–8.
- Source Channel - 1-8 of each of those channels
Metadata Settings
- Timecode: Inserts timecode extracted from H.264/HEVC SEI
- Closed Captions: Choose Off, 608 (SD), or 708 (HD) to pass captions when present.