Getting Started
- Introduction
  - About CaptionHub
  - Key concepts / glossary
  - Deployment options
- Interface overview
  - Dashboard
  - Project page
  - Caption Editor
  - Projects page
- Team settings
  - General
  - Workflow
  - Roles & permissions
  - Security
  - Caption settings
  - Language profiles
  - Caption style
  - Transcription
  - Translation
  - API keys
  - Languages
- First steps
  - Upload a video
  - Create original captions
- SSO setup
  - Setting up SSO
  - Setting up SCIM
Training videos
- Intro
  - CaptionHub overview
- Tutorials
  - Tutorial: Applying caption formatting
  - Tutorial: Audio events for Live
  - Tutorial: Automation
  - Tutorial: CaptionHub Connect
  - Tutorial: CaptionHub Connect with Automation
  - Tutorial: Configuring caption limits
  - Tutorial: Create a custom dictionary
  - Tutorial: Create, export, and publish voiceover
  - Tutorial: Creating original captions - Importing a transcript
  - Tutorial: Creating original captions - Uploading timed text
  - Tutorial: Creating your first project and original captions
  - Tutorial: Endonym support for language labels
  - Tutorial: Exporting finished work
  - Tutorial: Handover
  - Tutorial: Integrations overview
  - Tutorial: Interface overview
  - Tutorial: Live transcript widget
  - Tutorial: Managing connectors
  - Tutorial: Managing format templates
  - Tutorial: Managing users
  - Tutorial: Natural Captions©
  - Tutorial: Phrase with Automation
  - Tutorial: Set Live translation provider
  - Tutorial: Setting a default caption template
  - Tutorial: Setting a format template in automations
  - Tutorial: Supported languages in CaptionHub
  - Tutorial: Team Settings
  - Tutorial: Translating in CaptionHub - Using Machine Translation (MT)
  - Tutorial: Using the editor - Editing captions in the spreadsheet
  - Tutorial: Using the editor - Introduction to the timeline
  - Tutorial: Voiceover editor
Projects, users & teams
- Projects
  - Creating a project
  - Edit Project Info
  - Advanced options
  - Folders
  - Filters and Views
  - Organising projects: tags and tagging
  - Replacing project video
  - Deleting a project
  - Duplicating a project
  - Archiving a project
  - Video and audio format support
- Users
  - User roles
  - Creating users
  - Editing users
  - Permissions matrix
  - Resetting users' passwords
  - Setting up MFA
  - Enforcing MFA
  - Resetting MFA
Creating and editing captions
- Creating original captions
  - Create original captions
  - Auto transcribe
  - Importing a transcript
  - Create captions from timed text
  - Starting from scratch
  - Caption limits
  - Custom dictionaries
  - Custom dictionary examples
  - Speaker detection
  - Source propagation
  - Caption track 2
  - Automatic identification of on-screen text
  - Natural Captions©
  - Frame-based on-screen text capture
- Using the editor
  - Interface overview
  - Adjusting captions in the timeline
  - Adjusting captions in the spreadsheet
  - Warnings and limits
  - Exporting with validation warnings / errors
  - Keyboard shortcuts
  - Spellcheck in CaptionHub
  - Project metadata
  - Caption metadata
  - Re-align captions
  - Find & replace
- Translating in CaptionHub
  - Supported translation engines
  - Using Machine Translation (MT)
  - Using termbases
  - Pivot languages
  - Supported languages
- Formatting captions
  - Applying caption formatting
  - Managing format templates
  - Setting a default template
  - Setting a format template in automations
Voiceover
- Voiceover
  - Voiceover interface overview
  - CaptionHub Voiceover
  - Voiceover editing
  - Voice dictionaries
  - Voice cloning
  - Add ElevenLabs Voices to your Voice Library
Workflow & collaboration
- CaptionHub workflows
  - Workflows overview
  - Direct assignment workflow
  - Direct assignment with review workflow
  - Self serve workflow
  - Self serve with review workflow
  - Claim expiry
  - Assignment limiting
  - Approving a captionset
  - Handing over a captionset
- Translating outside of CaptionHub
  - Phrase connector
  - Trados connector
  - Round tripping timed text
- Collaboration
  - Segmentation and simultaneous translation
  - Add a producer to a project
  - Managing viewing / editing permissions for linguists
  - Notes, comments and project notes
- Tracking activity
  - Snapshots
  - Activity logs
  - Status icons
- Teams
  - Teams overview
  - Multiple teams
- Automation
  - Automation overview
  - Setting up Automation templates
  - Managing Automation templates
  - Applying Automation templates
  - Setting up Automation templates with CaptionHub Connect
Connectors
- Overview
  - Managing connectors
- Video platforms
  - OVPs matrix
  - Configure the Amazon S3 connector
  - Configure the Brightcove connector
  - Configure the Cloudflare Stream connector
  - Configure the Google Drive connector
  - Configure the JW Player connector
  - Configure the Kaltura connector
  - Configure the Mux connector
  - Configure the Qumu Cloud connector
  - Configure the Qumu VCC connector
  - Configure the Vimeo connector
  - Configure the YouTube connector
- Transcription
  - Amazon Transcribe
  - Scriptix (Whisper)
  - Speechmatics
- MT engines
  - Amazon Translate
  - Amazon Translate with Translation Memory (beta)
  - DeepL Translate
  - Google Translate
  - Language Weaver
  - OpenAI Translate (beta)
  - Systran
- TMS connectors
  - Crowdin
  - LILT
  - Phrase
  - Smartling
  - Trados
  - XTM
- AI connectors
  - Comprehend
  - OpenAI
  - Rekognition
- Voiceover
  - Amazon Polly
  - ElevenLabs
- Custom integrations
  - Unlock CaptionHub’s full potential with custom integrations
- CaptionHub Connect
  - Connect vendors
  - Notes, comments and project notes with Connect
Exporting finished work
- Subtitle export
  - Export timed text and transcripts
  - Subtitle and transcript formats
  - Generating burnt-in subtitles
  - Custom fonts for burnt-in subtitles
- Creating deliverables
  - Exporting burnt-in subtitles with Adobe Premiere
  - Creating movies with embedded subtitle tracks
  - Creating voiceover deliverables
  - Creating summaries
- Publishing from CaptionHub
  - Publishing subtitles and Voiceover
  - Language labels
- VOD transcript widget
  - VOD transcript widget for Brightcove
Analytics
- First steps
  - Analytics overview
  - Using Analytics
Timbra
- Live video captions
  - Introduction to live stream captions
- In-room captions
  - Introduction to in-room captions
  - Configure the in-room display
  - Using the in-room companion
- Configure a live project
  - Select the audio track for transcription
  - Translation providers and languages
  - Improve captioning and translation quality
  - Speaker detection in live streams
  - Display audio events
  - Primary and secondary transcription services
  - Control who can see live captions
  - Caption video streams with multi-track audio
  - Recommendations for styling captions
  - Recommendations for a redundant stream
  - Solution guide: securing captions using a proxy
- Operate a live event
  - Live pre-event checklist
  - Select which captions to show
  - Troubleshoot an event
  - When projects automatically stop
  - Export VTTs from a live stream
- Live video: HLS input
  - HLS ingest
  - Live captions for a Brightcove Live stream
  - Live captions for a Mux stream
  - Live captions for a AWS MediaPackage HLS stream
  - Live captions for a Cloudflare Live stream
  - Live captions for a Wowza Cloud stream
- Live video: using the plugin
  - Integrate using the Timbra plugin
  - Brightcove plugin support for live captions
  - Video.js plugin support for live captions
  - THEOplayer plugin for live captions
  - HLS.js plugin for live captions
  - Mux plugin for live captions
  - Live transcript widget
- Live video: HLS output
  - Introduction to HLS output
  - Integrate captions into your HLS manifest
  - Use a modified HLS manifest from CaptionHub
- API integration
  - Integrate with the API
  - Receive new captions via a WebSocket connection
- Platform integrations
  - Brightcove: import a Brightcove Live project into Timbra
  - Brightcove: requirements for a Brightcove Live stream
  - Brightcove: Configure the Timbra plugin for the Brightcove player
  - Brightcove: Update the Timbra plugin in Brightcove
  - Brightcove: Increase the HLS segment size in Brightcove
  - Brightcove: pre-event checklist - before you start a stream
- Reference
  - How browsers display captions natively
  - Known issues
CaptionHub Connect
- Overview
  - What is CaptionHub Connect?
  - CaptionHub Connect for clients
  - CaptionHub Connect for vendors
  - CaptionHub Connect with Automation
  - CaptionHub Connect requests page
FAQ and Troubleshooting
- Frequently asked questions
  - Using CaptionHub
  - Billing
  - Security
  - Infrastructure
  - Service & support
  - Cookies
  - Email notifications
  - Subtitle specifications/style guides
- Troubleshooting
  - Accessing browser data
  - Resetting your browser
  - Text encoding
  - External resources
Developers
- API
  - Get started with our API
  - Create an API key
  - Webhooks
  - Starter guide: caption a video using the API
More

Receive new captions via a WebSocket connection

Get access to captions via our API

Last updated on December 3, 2025

When a stream is running you can receive new captions via a WebSocket connection. This functionality is currently in private beta, please contact us for more information.

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Integrate with the API Brightcove: import a Brightcove Live project into Timbra