Trained stenocaptioner or speech-trained captioner with prepared glossary
Live captioning services
Scope live captioning with event type, language, latency, and accuracy target settled first.
Run real-time captioning for an event with the captioner staffing, latency target, accuracy target, captioning platform integration, and recording or archive policy confirmed in writing before the session goes live.
Upload files for a quote
Short form: name, work email, runtime, platform, target languages, and media files or links if ready.
Typical real-time delay for trained stenocaptioning
Zoom, Teams, Webex, Streamyard, Hopin, Restream, OBS, broadcast encoder
Communication Access Realtime Translation for accessibility settings
Dynamic Dialects supports requests across 250+ languages with ISO 9001/27001 operating controls, ISO 17100 applied to translation scopes, 40,000+ vetted linguists, named project coordination, and written confirmation before production work begins.
Evidence for review
What DD can show before a buyer commits.
This is not a public case study claim. It is DD-owned evidence a buyer can request when the work needs vendor review before a scope is approved.
Ask for proof details- Buyer type
- Live captioning services buyer, vendor manager, or operations lead qualifying DD before sending a live requirement.
- Problem
- The buyer needs scope live captioning with event type, language, latency, and accuracy target settled first. scoped by files, audience, language pair, deadline, recipient rules, and review process before quote approval.
- Scope
- Live captioning services work coordinated by DD with written request review, named PM ownership, and review records matched to the request type.
- Constraint
- This page cannot rely on a public case study yet; it must point to DD-owned proof artifacts and disclosure-safe process evidence.
- DD action
- DD confirms the inputs, missing details, staffing option, quality check, and delivery record before production work begins.
- Evidence available
- Private proof can include a request-specific checklist, redacted QA summary format, delivery record format, and sourcing or reviewer notes.
- Outcome
- The buyer can judge whether DD fits the requirement before sending production files or adding this service to a vendor shortlist.
- Disclosure status
- DD-owned proof only. Public outcomes require client approval; redacted process artifacts can be shared when terms allow.
How the work runs
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Scope the session
Event type, language, expected duration, target accuracy, target latency, captioning platform integration, and recording policy confirmed in writing first.
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Prepare the glossary
Subject-matter terminology, speaker name list, slide preview, and acronym list reviewed by the captioner in advance to anchor measured accuracy at 98 percent or higher.
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Run a pre-event tech check
Captioning platform integration tested against Zoom, Teams, Webex, Streamyard, or the broadcast caption encoder; latency measured, fallback connection confirmed.
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Caption the session live
Trained stenocaptioner sustaining 98%+ accuracy and 3-5s latency. Two-captioner relay for sessions beyond the single-captioner window to maintain accuracy across long events.
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Export the transcript
Raw real-time output or lightly edited clean transcript exported in the agreed format, with recording archive of the caption stream when in scope.
Each live captioning engagement starts with a written specification confirming the event type (conference keynote, panel session, webinar, broadcast newscast, classroom lecture, government public meeting, corporate town hall, CART for an individual viewer), language and source audio quality, expected duration, captioner staffing (single captioner for sessions under a target length, two-captioner relay for longer sessions to maintain accuracy), platform integration (Zoom, Microsoft Teams, Webex, Streamyard, Hopin, Restream, OBS, broadcast caption encoder), target latency (typical 3 to 5 seconds for trained stenocaptioners), target accuracy (typical 98 percent or higher for prepared content with subject-matter glossary), and the recording or archive policy. A pre-event tech check is run against the platform before the session goes live.
For media work, DD checks source quality, timing, platform format, speaker treatment, and output files before quoting.
What this page helps you send
- Conference and event live captioning (keynote, panel session, breakout, in-person and hybrid) with on-screen caption display or platform integration.
- Webinar live captioning for Zoom, Microsoft Teams, Webex, Streamyard, Hopin, and Restream with reviewer-grade accuracy.
- Broadcast live captioning for news, sports, awards shows, and live programming with CEA-608 or CEA-708 encoder integration.
- CART (Communication Access Realtime Translation) for individual deaf or hard-of-hearing viewers in classrooms, meetings, medical settings, and legal settings.
- Government public meeting captioning for city councils, school boards, and state legislative sessions with open-meetings accessibility scope.
- Classroom and lecture live captioning for university accessibility offices and K-12 special education programs.
- Corporate town hall and all-hands live captioning with executive subject-matter glossary prepared in advance.
- Multi-language live captioning where the same event needs same-language captions in two or more languages with a captioner per language.
What you receive
- Live caption stream rendered during the session with target latency and target accuracy honored.
- Captioner staffing matched to event length (single captioner under target threshold, two-captioner relay for long sessions).
- Pre-event tech check against the captioning platform and a quick subject-matter glossary review with the event team.
- Post-event transcript exported in the agreed format (raw real-time output, or lightly edited clean transcript on request).
- Recording archive of the live caption stream when the event team confirms recording in the program scope.
Questions teams ask first
What is the difference between live captioning and offline captioning?
Live (real-time) captioning is produced during the event by a trained stenocaptioner or speech-trained writer with a target latency of 3 to 5 seconds and a target accuracy of 98 percent or higher when prepared content is reviewed in advance. Offline closed captioning is produced after the event from a recording, with verbatim or edited mode and platform-specific style guide compliance scoped per program. Live captioning is for the event audience watching the session as it happens; offline captioning is for the recording afterwards.
What is CART and how does it differ from a live caption stream?
CART (Communication Access Realtime Translation) is live captioning produced for an individual deaf or hard-of-hearing viewer or a small group in a classroom, meeting, medical setting, or legal setting. CART writers are professional stenocaptioners certified by the National Court Reporters Association (NCRA) or equivalent. A CART feed is delivered to the individual's tablet, laptop, or in-room display rather than to a broadcast caption stream. The session is scoped per program with the participant's preferences (font size, color, position) confirmed in advance.
Which platforms integrate with live captioning?
Common integrations include Zoom (native closed caption API), Microsoft Teams (caption stream integration), Webex (caption integration), Streamyard, Hopin, Restream, OBS Studio (via caption plug-in), and broadcast caption encoders (EEG iCap, Link Electronics PCE-845, or equivalent for CEA-608 and CEA-708 broadcast delivery). Custom platform integrations are scoped per program with a pre-event tech check against the target platform before the session goes live.
Why is two-captioner relay used for long sessions?
Live stenocaptioning at conversation pace (140 to 180 words per minute typical, faster for prepared executive content) is mentally intensive work. A single captioner can sustain accuracy for a target session length, after which fatigue starts to reduce accuracy. For sessions that exceed the target single-captioner window, a two-captioner relay (one captioning, one recovering and preparing, switching every 15 to 30 minutes) maintains the target accuracy across a multi-hour event without the audience seeing a quality drop.
How is accuracy measured for live captioning?
Accuracy is measured against the audio transcript on a per-session basis using the NER (Number-Edition-Recognition) model or a simpler verbatim-match measurement. Target accuracy of 98 percent or higher applies when a subject-matter glossary and slide preview are reviewed by the captioner before the session. Accuracy drops are typically caused by unprepared technical terminology, heavy accents without a sample, and poor source audio. Pre-event preparation is the largest single factor in measured accuracy.
Is broadcast-grade live captioning supported for TV?
Yes. Broadcast live captioning for TV programming is delivered via CEA-608 (legacy NTSC) or CEA-708 (digital ATSC) caption encoder integration. Stenocaptioners for broadcast work with the master control or network feed via an EEG iCap session, Link Electronics encoder, or equivalent broadcast caption infrastructure. FCC regulatory compliance for the programming class (live news, sports, awards) is honored, including target accuracy thresholds per FCC quality standards.
Can live captioning run in multiple languages at the same event?
Yes. Multi-language live captioning is scoped per language with a dedicated captioner per language. The same conference keynote can be live-captioned in English on one display feed and live-captioned in Spanish on another feed by a Spanish-language stenocaptioner. Multi-language live captioning is distinct from simultaneous interpretation: interpretation produces a live audio feed in the target language, while multi-language live captioning produces a live text feed in the target language.
What happens to the live caption stream after the event?
Post-event, the live caption transcript can be exported as a raw real-time output (timestamped, exactly as the audience saw it) or as a lightly edited clean transcript with quick proofreading applied. The export format and the level of post-event clean-up are confirmed in the program scope. Recording archives of the live caption stream are produced when the event team confirms recording in the program scope and the participants are informed at the start of the session.