---
title: ZEC Adding SRT Outputs
slug: zixi-broadcaster-zec-current-version/zec-adding-srt-outputs
docTags:
createdAt: 2024-12-26T19:39:59.182Z
---
The SRT output can be pulled to/from an SRT-enabled device and is configured via Zen Master or Zixi API only. SRT stands for ‘Secure Reliable Transport’ and is an open-source video transport protocol and technology stack. SRT uses secure streams and easy firewall traversal to optimize streaming performance and deliver high-quality video over even the most unreliable networks.
:::hint{type="success"}
Reference: Broadcaster versions and their associated SRT Library
- Version 19 - SRT Library 1.5.5
- Version 18 - SRT Library 1.5.4
- Version 17 - SRT Library 1.5.3
- Version 16 - SRT Library 1.4.4
See the steps below to override the default SRT library with an older version for compatibility with a downstream system.
:::
## To Create an SRT Output:
::::WorkflowBlock
:::WorkflowBlockItem
In the ZEC Outputs page, click **+ New Output**.
The **New output** window is displayed.
:::
:::WorkflowBlockItem
Type in the unique identifier for this output in the **Output Name**.
:::
:::WorkflowBlockItem
Select an** Input Stream** to be made available on this output from the drop-down list.
:::
:::WorkflowBlockItem
Select the **Show in Matrix** check box to display this stream in the Matrix (see [ZEC Using the Matrix](docId\:OfxetHpsUO9EIMqpWFZEa)). Default: Selected.
:::
:::WorkflowBlockItem
Select the **Log this stream** checkbox if you would like to generate event logs for this output.
:::
:::WorkflowBlockItem
Select **SRT**.
:::
:::WorkflowBlockItem
Specify the **Output parameters** (see [Output Stream Parameters Table](docId\:LZAvpaBAKB4AXpBRr-lyw) below).
:::
:::WorkflowBlockItem
You can decrypt an encrypted stream as it enters the ZEC. To decrypt a stream, select the Decrypt Stream checkbox and fill in the parameters as described in the [Output Stream Parameters Table](docId\:LZAvpaBAKB4AXpBRr-lyw) below. For more information, see [Decrypting an Output Stream in ZEC](docId\:fQloypIDPiB19CqFvU8Rz).
:::
:::WorkflowBlockItem
Click **OK**.
The new SRT Output with its settings is created and now appears on the screen.
:::
::::
### Output Stream Parameters Table
| **Parameter** | **Description** |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Output Parameters** | |
| **Listening Port** | Specify the port to listen on. This port must be open on all firewalls between the ZEC and other devices it is communicating with. |
| **Password \[10-80]** | If you want the output stream to be **encrypted**, set a **Password. **The value should be between 10 to 80 characters. The password value serves as a passphrase and is used to generate a hash of the password. The passphrase serves both authentication and encryption purposes. It is is not the AES key itself, but an input to a key derivation process that generates a 128, 192, or 256-bit key length. See [ZEC Encrypting an SRT Output](docId\:vYOcUKPHZ4_W3aUfgCBly) for more details. |
| **Verify Stream ID** | Enable this option to use a single port for multiple SRT outputs. The system will identify the stream by verifying its Stream ID. |
| **Latency \[ms]** | Specify a latency for the stream in milliseconds. To learn more about latency, see [Latency Considerations](docId\:b5ijrtxUIcWxU7rCmdHza). |
| **Encryption type** | Select the encryption type that will be used. The final AES key length is established by combining the sender’s and the receiver’s key lengths during handshake. See [ZEC Encrypting an SRT Output](docId\:vYOcUKPHZ4_W3aUfgCBly) for more details. |
| **Bind to IP** | Select from the drop-down list the local IP address to be used for this Output, OR select *Any *to enable any IP to be used. |
| **SRT version** | Select the SRT library for compatibility with downstream systems.
* Version 19 - SRT Library 1.5.5
* Version 18 - SRT Library 1.5.4
* Version 17 - SRT Library 1.5.3
* Version 16 - SRT Library 1.4.4 |
| **Enable Decryption** | Select this checkbox to decrypt an encrypted stream. |
| **Decryption type** | If the stream has been encrypted, you can decrypt it through the output by selecting this checkbox and specifying the type of encryption that was used.
Select **Automatic** to decrypt a stream that has been encrypted using **Automatic** encryption.
Only if the stream has not been encrypted, leave the **Enable Decryption **checkbox unselected (default).
***Important Notice: If the stream has been encrypted, you must decrypt it in the output.*** |
| **Decryption key** | If the decryption type includes a key, enter the key to decrypt the stream during output. |
## Advanced Mode
The fields discussed below are optional and available only in **Advanced Mode**.
To enter Advanced Mode add the URL parameter `?advanced=1` to the ZEC URL in your browser and press Enter/Return to reload the page:
::Image[]{src="https://api.archbee.com/api/optimize/amUtKWPrNQCS-26DKyGuI-5OBE4QsRN0icABdoD4ciK-20250421-173825.png" size="70" width="800" height="56" position="center" alt="Advanced Mode URL Param" darkWidth="800" darkHeight="56" showCaption="false"}
:::hint{type="info"}
Note the Advanced Mode settings are generally intended for advanced users and special cases. If you do not understand the settings, you should probably accept the default values.
:::
### General
- **Latency offset \[ms]** - Specify the additional buffering time in milliseconds. Increasing this value can improve stream stability in unstable network conditions, but will increase end-to-end delay. Default: 0 ms