Getting Started
- Introduction
  - About CaptionHub
  - Key concepts / glossary
- Interface overview
  - Dashboard
  - Project page
  - Caption Editor
  - Projects page
- Team settings
  - Team settings overview
  - Review and approve
  - Enterprise security features
  - Defaults for captions
  - Transcription
  - Languages
- First steps
  - Upload a video
  - Create original captions
- SSO setup
  - Setting up SSO
Training videos
- Intro
  - CaptionHub overview
- Tutorials
  - Tutorial: Handover
  - Tutorial: Managing users
  - Tutorial: Team Settings
  - Tutorial: Interface overview
  - Tutorial: Configuring caption limits
  - Tutorial: Creating your first project and original captions
  - Tutorial: Creating original captions - Uploading timed text
  - Tutorial: Creating original captions - Importing a transcript
  - Tutorial: Using the editor - Introduction to the timeline
  - Tutorial: Using the editor - Editing captions in the spreadsheet
  - Tutorial: Translating in CaptionHub - Using Machine Translation (MT)
Projects, users & teams
- Projects
  - Creating a project
  - Edit Project Info
  - Advanced options
  - Organising projects: tags and tagging
  - Replacing project video
  - Deleting 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
- 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
Workflow & collaboration
- CaptionHub workflows
  - Workflows overview
  - Direct assignment
  - Direct assignment, with Review
  - Self Serve
  - Self Serve, with Review
  - Claim expiry
  - Assignment limiting
  - Approving a captionset
  - Handing over a captionset
- Translating outside of CaptionHub
  - Phrase connector
  - Round tripping timed text
- Collaboration
  - Segmentation and simultaneous translation
  - Adding Producers to a Project
  - Managing viewing / editing permissions for linguists
  - Notes and commenting
- Tracking activity
  - Snapshots
  - Activity logs
  - Status icons
- Teams
  - Teams overview
  - Multiple teams
- Automation
  - Automation overview
  - Setting up Automation templates
  - Setting up Automation templates with CaptionHub Connect
Connectors
- Overview
  - Managing connectors
- Video platforms
  - Brightcove
  - Qumu VCC
  - Qumu Cloud
  - JW Player
  - Mux
  - Vimeo
  - YouTube
  - Cloudflare Stream
  - Google Drive
  - Kaltura
- MT engines
  - Amazon Translate
  - Language Weaver
  - DeepL
  - Google Translate
- TMS connectors
  - Phrase
  - Trados
- Custom connectors
  - API documentation
  - Webhooks
Exporting finished work
- Subtitle export
  - Export timed text
  - Subtitle formats
  - Creating burnt-in subtitles
  - Formatting burnt-in subtitles
  - Custom fonts for burnt-in subtitles
- CaptionHub Voiceover
  - CaptionHub Voiceover
  - Voice dictionaries
- Creating deliverables
  - Exporting burnt-in subtitles with Adobe Premiere
  - Creating movies with embedded subtitle tracks
- Publishing from CaptionHub
  - Publishing subtitles and Voiceover
Analytics
- First steps
  - Analytics overview
  - Using Analytics
CaptionHub Live
- Live captioning
  - Introduction to live captions
  - Improve captioning and translation quality
  - Selecting which captions to show
  - Exporting VTT from a live stream
  - Adjusting settings whilst a stream is in progress
  - Speaker detection in live streams
  - Known issues with live captions
  - Selecting the audio track for transcription
- Integrate using the CaptionHub Live plugin
  - Supported players for CaptionHub Live plugin
  - Brightcove plugin support for live captions
  - Video.js plugin support for live captions
  - THEOplayer plugin for live captions
- Supported HLS streams
  - Supported HLS streams
  - Live captions for a Brightcove HLS stream
  - Live captions for a Mux HLS stream
  - Live captions for a AWS MediaPackage HLS stream
  - Live captions for a Cloudflare Live stream
- Integrate captions into HLS
  - Introduction to HLS integration
  - Integrate captions into your HLS stream
  - Use a modified HLS manifest from CaptionHub
- Receiving captions via the API
  - Downloading captions via our API
  - Receive new captions via a webhook
- Brightcove Live
  - Caption a Brightcove live stream
  - Requirements for a Brightcove Live stream
  - Configure the CaptionHub Live plugin for the Brightcove player
  - Update the CaptionHub plugin in Brightcove
  - Brightcove Live pre-flight checklist - before you start a stream
  - Increase the HLS segment size in Brightcove
CaptionHub Connect
- Overview
  - What is CaptionHub Connect?
  - CaptionHub Connect for clients
  - CaptionHub Connect for vendors
  - CaptionHub Connect with Automation
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
More

Increase the HLS segment size in Brightcove

Improve transcription quality for your Brightcove live stream

Last updated on September 24, 2024

There are a number of things you can do to improve live caption quality. Increasing the segment size of your HLS stream will allow CaptionHub to improve the caption quality. The recommended segment size is 10 seconds. The minimum is 5 seconds.

In Brightcove, go to Ingest Profiles and choose the profile that you use for your live streams.

If you use a default Brightcove profile (like “Premium Live HD 1080p - Tier 2”), click to duplicate the profile

For each rendition, update the segment_seconds value to 10:

Save the profile

Next time you create a live stream, select the new profile

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Brightcove Live pre-flight checklist - before you start a stream What is CaptionHub Connect?