Step 5: Output (HLS) - How do I configure HLS Output for my Service using the new UI?

In this step, you will configure where and how your processed captions, subtitles, and dubbed audio are delivered. For a list of all steps see our Service Wizard Steps below.

Stream Type: Select HLS as your stream type.

Delivery Method: Choose how your output stream will be delivered. For HLS output, only PUSH is available.

HLS PUSH

Use this option when SyncWords will push the output HLS stream with processed captions, subtitles, and dubbed audio to your specified destination. HLS PUSH supports multiple destination types optimized for different platforms and storage solutions. This setup is ideal for delivering captioned HLS streams to CDNs, cloud storage services, or streaming platforms.

Destination: Select the destination type where your HLS output will be delivered. Available options include:

• HTTP Post - Publish HLS segments and manifests to an HTTP endpoint

• S3 Bucket - Store HLS output in an Amazon S3 bucket

• Media Store - Deliver to AWS Elemental MediaStore

• MediaPackage v1 - Publish to AWS Elemental MediaPackage v1

• MediaPackage v2 - Publish to AWS Elemental MediaPackage v2

Select the destination that matches your streaming infrastructure. Configuration options will vary based on your selection.

HTTP Post 

Use HTTP Post to publish HLS segments and manifests to any HTTP endpoint that accepts POST requests.

Destination URL: Enter the destination directory URL where SyncWords will publish the master manifest and associated files. This must be a directory path where the Service can write HLS segments, manifests, and subtitle files.

Multivariant Manifest Name: Enter the filename for the master (multivariant) manifest that will be created. This is the primary playlist file that references all variant streams and subtitle tracks.

Buffer: Set the buffer duration in seconds. See Buffer Settings below.

Advanced Settings: Additional configuration options are available in the Advanced Settings section. Details about these optional settings are listed below.

S3 Bucket

Use S3 Bucket to store your HLS output directly in an Amazon S3 bucket for scalable, reliable cloud storage.

Bucket Name: Enter the name of your AWS S3 bucket where the HLS output will be stored.

Path: Enter the directory path within your S3 bucket where files will be stored. This creates a folder structure for organizing your streams.

AWS Region: Select the AWS region where your S3 bucket is located from the dropdown menu. Choose the region closest to your viewers for optimal performance.

Multivariant Manifest Name: Enter the filename for the master manifest that will be created in your S3 bucket.

Buffer: Set the buffer duration in seconds. See Buffer Settings below.

Advanced Settings: Additional configuration options are available in the Advanced Settings section. Details about these optional settings are listed below.

Media Store

Use Media Store to deliver your HLS output to AWS Elemental MediaStore for low-latency live streaming workflows.

Endpoint URL: Enter the URL of your AWS Elemental MediaStore container endpoint. This is provided by AWS when you create a MediaStore container.

Path: Enter the directory path within your MediaStore container where files will be stored. This path will be appended to the endpoint URL.

Multivariant Manifest Name: Enter the filename for the master manifest that will be created.

Buffer: Set the buffer duration in seconds. See Buffer Settings below.

Advanced Settings: Additional configuration options are available in the Advanced Settings section. Details about these optional settings are listed below.

MediaPackage v1

Use MediaPackage v1 to ingest your HLS output into AWS Elemental MediaPackage v1 for reliable, scalable content delivery with built-in redundancy.

Endpoint URL: Enter the HLS Ingest Endpoint URL from your AWS Elemental MediaPackage v1 channel. This URL is provided in your MediaPackage channel configuration.

Username: Enter the WebDAV username for authentication to your MediaPackage v1 endpoint. This credential is generated by AWS MediaPackage when you create a channel.

Password: Enter the WebDAV password for authentication to your MediaPackage v1 endpoint. This credential is generated by AWS MediaPackage when you create a channel.

Buffer: Set the buffer duration in seconds. See Buffer Settings below.

Advanced Settings: Additional configuration options are available in the Advanced Settings section. Details about these optional settings are listed below.

MediaPackage v2

Use MediaPackage v2 to ingest your HLS output into AWS Elemental MediaPackage v2, which offers enhanced features and IAM-based authentication.

Endpoint URL: Enter the HLS Ingest Endpoint URL from your AWS Elemental MediaPackage v2 channel. This URL is provided in your MediaPackage v2 channel configuration.

Buffer: Set the buffer duration in seconds. See Buffer Settings below.

Advanced Settings: Additional configuration options are available in the Advanced Settings section. Details about these optional settings are listed below.

Buffer Settings

The buffer setting is available for all destination types and controls the latency of your output stream.

Set the buffer duration in seconds to manage latency and ensure stable output transmission. Latency allows perfected timing of captions, subtitles, and dubbing with the audio in the stream.

• The default 30-second buffer is recommended when using translated subtitles

• A 60-second buffer is recommended when enabling dubs, as audio synthesis requires additional processing time

• For low-latency delivery of same-language captions, use a value greater than your HLS segment size or a minimum 5-second buffer

Navigation Options

At the bottom of the screen, you will see the following actions:

• Cancel - Cancels the creation of your Service and exits the wizard.
• Reset - Clears all fields and settings in the Wizard so you can start over.
• Step Back - Returns to the previous step if you need to modify earlier settings.
• Continue - Moves to the next step of the wizard once the required fields are completed.

Advanced Settings

To access the Advanced Settings, click the Advanced Settings dropdown on the page. This section provides optional configuration parameters for optimizing HLS output delivery and performance.

Reference Original Media: Enable this toggle to avoid copying and re-publishing original video TS (Transport Stream) segments when it is not necessary. This option is used for HLS Append Mode, where SyncWords only contributes captions, subtitles, and dubbed audio tracks while referencing the original video segments.

HLS Reference: Enter the URL of an external HLS playlist to package against when using Reference Original Media mode. This field specifies the location of the original HLS stream that SyncWords will reference rather than republish.

Late Caption Timeout: Set a threshold (in hours:minutes:seconds:milliseconds format) after which captions arriving too late should be skipped. This prevents outdated captions from appearing if they are delayed beyond a reasonable limit. The default is 00:00:30.000 (30 seconds).

Service Wizard Steps