--- title: Adding SRT Streams slug: zixi-broadcaster-zec-current-version/adding-srt-streams docTags: createdAt: 2024-12-25T19:47:07.569Z --- SRT (Secure Reliable Transport) is an open-source video streaming protocol that brings pristine quality, low-latency live video over the public internet. This enables the Broadcaster to receive an SRT stream. The source of the stream is an SRT client that pushes the stream into Zixi Broadcaster. The connection is initiated by the source SRT client, which connects to the Listening Port on the Zixi Broadcaster. The connection can be password-protected. More details about SRT can be found at [https://www.haivision.com/products/srt-secure-reliable-transport/](https://www.haivision.com/products/srt-secure-reliable-transport/). :::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 Add an SRT Stream: :::::WorkflowBlock :::WorkflowBlockItem In the Zixi Broadcaster Navigation menu, click the **Inputs** tab. ::: :::WorkflowBlockItem In the Menu bar, click **New Input**. The **Add a new input stream** window is displayed. ::: ::::WorkflowBlockItem Enter the unique **Stream I.D**. :::hint{type="info"} Note this must be identical (case sensitive) to the stream name configured in ZEC. ::: :::: :::WorkflowBlockItem Enter the maximum concurrent connections to this stream from the **Max. Outputs** drop-down list. Default: Unlimited. ::: :::WorkflowBlockItem Select the **Show in Matrix** check box to display this stream in the Matrix (see [Using the Matrix](docId\:bP6MO9f2QbxmU6gURKoG4)). Default: Selected. ::: :::WorkflowBlockItem Select the **Log this stream** checkbox if you would like to generate event logs for this input. ::: :::WorkflowBlockItem Select the **Analyze **checkbox if you would like to enable stream analysis for the input. ::: :::WorkflowBlockItem Select **SRT** for the input stream. ![](https://api.archbee.com/api/optimize/mzxtTQEvCNIdUNgF2kuwJ/M1jApdn4Gnr_ApLm8r4li-20260605-135826.png) ::: :::WorkflowBlockItem If you want to override the default version of the SRT library used for compatibility with downstream systems, select the desired version from from **SRT version** selector: ![](https://api.archbee.com/api/optimize/mzxtTQEvCNIdUNgF2kuwJ/539LzMaYVJA5g5SZKBIXl_bx19-srt-lib-selector.png) ::: :::WorkflowBlockItem Specify the **Stream Parameters** (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh)). ::: :::WorkflowBlockItem If you want to specify **Billing Codes** to identify and differentiate traffic on a Zixi Broadcaster for billing purposes, select this checkbox (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh) below) ::: :::WorkflowBlockItem If you want to **Enable time shift,** select this checkbox (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh)). ::: :::WorkflowBlockItem If you want to **Enable multicast on pull outputs**, select this checkbox (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh)). ::: :::WorkflowBlockItem If you want to **Enable encryption** select this checkbox (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh)). For more information, see [Encrypting an Input Stream in Zixi Broadcaster](docId:5SH-sqkz1lgkMgZJsQRzQ). ::: :::WorkflowBlockItem If you want to configure the **Recording Parameters**, specify them in the respective fields (see [Input Stream Parameters Table](docId\:OGZXna3gvDrdPXTqbhZPh)). ::: :::WorkflowBlockItem Click **OK**. ::: ::::: ### Input Stream Parameters Table | **Parameter** | **Description** | | ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Stream parameters** |
| | **Listening Port** | Specify the port to listen on. This port must be open on all firewalls between the Zixi Broadcaster and other devices it is communicating with. | | **Password** | If the stream is password-protected, enter the password. | | **Latency** | Specify the maximum latency of the stream in milliseconds. Default: 1000 | | **Verify Stream ID** | Select this option to verify that the stream ID of this input matches the stream ID in the SRT feed before allowing the connection. | | **Max bitrate \[kbps]** | Specify the maximum expected bitrate for memory allocation. Recommended: **2X the actual (average) bitrate**, which will prevent buffer overruns (especially with VBR streams). Default: 10000.
Note – Overflows will typically occur when the Max Bitrate isn’t sufficient. | | **Bind to IP** | Select from the drop-down list the local IP address to be used for this Input, OR select *Any *to enable any IP to be used. | | **SRT Version** | Override the default version of the SRT library used for compatibility with downstream systems. | | **Billing Codes** | Billing codes are used to identify and differentiate traffic on a Zixi Broadcaster for billing purposes. When a billing code is added to a Source or Target, Zixi can track the traffic on that Broadcaster input or output separately from other inputs and outputs on the same Broadcaster. Billing codes are created by Zixi personnel on the Zixi Customer Portal for a particular organization. | | **Billing Code** | Enter the billing code that corresponds to this stream. The relevant billing can be obtained from the organization that received the billing code from Zixi. | | **Billing password** | Enter the password that corresponds to this billing code. | | **Enable time shift** | Select this checkbox to record the stream content and broadcast it after a specified delay. To deploy an input stream that uses the current stream's time shift, you need to configure a "Delayed" input stream. (See ). | | **Maximum delay \[hh\:mm\:ss]** **(for Time Shift enabled)** | Specify the maximum time delay of this input. | | **Enable multicast on pull outputs** | Select this checkbox to enable the transmission of this stream’s outputs as multicast. A Zixi receiver that will pull the stream will receive it in multicast. By default, Zixi Broadcaster is configured to allow transparent fallback to unicast if it is out of the LAN. Requires enabling Multicast Pull in the Settings. | | **Multicast-Only** **(for multicast enabled)** | Selecting this checkbox will force the transmission of this stream only in multicast. | | **Enable Encryption** | Select this checkbox to encrypt the Input stream. For more information, see [Encrypting an Input Stream in Zixi Broadcaster](docId\:V3RYrBN08r4CojWl-wVoQ). | | **Encryption type (for Encryption enabled)**

| Specify the type of Encryption (AES 128/192/256). | | **Encryption key (for Encryption enabled)** | Click **Generate** to generate an encryption key. The generated encryption key must be sent to the end-user to decipher the received encoded stream. | | ***Recording parameters*** | Select this checkbox to customize the recording parameters. | | ***Destination Type*** | Select the radio button for the desired storage type and then fill in the relevant parameters.
* **Record to disk** – the recording is saved on the local disk. It is possible to record to an external destination by replacing the default storage location with a symbolic link. To learn more, see the [Using an External Storage](https://zixidocumentation.atlassian.net/wiki/spaces/117/pages/4887944898/Using+an+External+Storage) section. * **Record to S3** – the file is saved to your AWS S3 Bucket. The mechanism uses AWS multipart upload. Amazon advises defining a lifetime rule for objects in the destination bucket. | | ***Record to Disk Parameters*** | | | **File Name Template** | Specify the file name pattern that Zixi will use to generate when saving the recorded content. A separate file will be generated for each recording up to the time specified in the Max recorded file duration parameter (see above). After this duration, a new file will be generated.
The file name pattern can include any string and up to five variables listed below. Only the %T=HH.MM.SS creation time is mandatory. You can change the order of these variables and add text as long as you maintain the legitimate structure of the file in Linux and Windows:
* %S=stream id - optional. * %Y=year - optional * %M=month - optional * %D=day - optional * %T=HH.MM.SS creation time - mandatory * %U=YYYYmmddTHHMMSSZ UTC timestamp - optional
For example, the following pattern %Y\_recording%T.ts will generate the following file name 2017\_recording15:32:35.ts. | | **Max recorded file duration \[hours]** | Specify the maximum time allotted for recording a video stream. Default: 2 hours | | **Keep recorded files for \[hours]** | Specify the maximum time for storing the recording. Default: 0 hours | | **Custom Path** | Optionally specify a storage location for the recorded files that is relative to the root folder. This location bypasses the location specified as the root folder in the **Settings** > **General **screen. | | ***Record to S3 Parameters*** | | | **File Name Template** | Specify the file name pattern that Zixi will use to generate when saving the recorded content. A separate file will be generated for each recording up to the time specified in the Max recorded file duration parameter (see above). After this duration, a new file will be generated.
The file name pattern can include any string and up to five variables listed below. Only the %T=HH.MM.SS creation time is mandatory. You can change the order of these variables and add text as long as you maintain the legitimate structure of the file in Linux and Windows:
* %S=stream id - optional. * %Y=year - optional * %M=month - optional * %D=day - optional * %T=HH.MM.SS creation time - mandatory * %U=YYYYmmddTHHMMSSZ UTC timestamp - optional
For example, the following pattern %Y\_recording%T.ts will generate the following file name 2017\_recording15:32:35.ts. | | **Max recorded file duration \[hours]** | Specify the maximum time allotted for recording a video stream. Default: 2 hours | | **URL** | Specify the URL of the S3 bucket. | | **Ignore TLS certificate errors** | TLS certificate for S3 bucket might be detected as faulty if bucket name contains dot\[s]. When this option is selected, Zixi Broadcaster will ignore the TLS certificate errors and transmit the stream to its destination. | | **Access Key** | The access key that is used for accessing the S3 bucket. | | **Secret Key** | The secret key that is used for accessing the S3 bucket. | ## 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 Zixi Broadcaster 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="55" position="center" alt="Advanced Mode URL Param" darkWidth="800" darkHeight="55" 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. ::: ![SRT Stream input menu](https://api.archbee.com/api/optimize/mzxtTQEvCNIdUNgF2kuwJ/tYgoyUm_IkDyYSfrVI5PC_image.png "SRT Stream input menu") - **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 - **Inject Metadata** - allows Zixi create a PID that carries information about what hops a feed has travelled through on the way to its destination, it includes things like CC errors and IAT at each hop. The information is useful for debugging issues with streams. ### SCTE-35 The most commonly used advanced settings are those which relate to SCTE markers: - **Support SCTE-35 injection** - select this if you want to be able to insert your own SCTE-35 messages for such purposes as inserting a preroll or ad break - **SCTE-35 PID** - You can specify a specific PID for SCTE-35 injection, or leave it at the default **AUTO** value - **Remove old SCTE-35 packets** - If you are inserting new SCTE-35 messages, it's a good idea to remove any old ones, unless you know what they are and that they need to stay - **Timeout for** CBR - Number of MS to wait for a null packet to insert SCTE-35 (keeps the stream CBR). ### Stream Parameters - **Compression** - Enables bandwidth optimization by replacing NULL packets with signaling information embedded in packet headers. This reduces the overall bitrate without affecting content integrity. Since not all receivers support this compression method, it is optional. The system can receive compressed streams, but will only transmit compressed data when this option is explicitly enabled. - **Fast connect** - Enables faster session establishment by reducing the time required to initiate the RIST connection. This is useful in environments where rapid recovery or quick stream startup is required. Support for this feature may vary depending on the receiving endpoint. ### Enable Multicast on pull outputs - **Custom multicast address** - Select this checkbox to manually define a specific multicast IP address and port for the output stream, overriding the system's global Multicast Pool settings. - Multicast** IP** - Enter the Multicast IP address. - **Port** - Specify the port to listen on. This port must be open on all firewalls between the Zixi Broadcaster and other devices it is communicating with.