Live Captioning for Linear TV

High-accuracy, low-latency captions for live news, sports and 24/7 playout — supporting Teletext (Newfor) and TTML/EBU-TT-D workflows, with 55+ input languages.

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Television Broadcast Live Captioning Features

Broadcast-Grade AI Live Captioning Engine

Deliver real-time captions for live broadcast with 1–2s end-to-end latency, engineered for deterministic performance in MCR, production, and playout environments. Designed for continuous 24/7 channel output, live news, sports, and dynamic program formats where resilience, accuracy, and low latency are critical.

The engine delivers broadcast-grade accuracy using advanced ASR models with domain-specific vocabulary handling for names, terminology, and event-specific language. Supports live captioning in 55+ input languages for regional and multilingual broadcast markets.

Optimised for on-air reliability, the system supports continuous live operations with automatic failover options and monitoring. Built to integrate into both SDI and SMPTE 2110/IP broadcast architectures without disrupting the existing signal chain.

ASR-Agnostic Speech-to-Text Layer

Txtplay integrates with multiple broadcast-grade ASR engines, ensuring high-accuracy speech recognition for live production environments. The ASR component can be deployed in the cloud, on-prem, or in a hybrid model, allowing broadcasters to select the optimal setup for latency, data control, and security requirements.

Subtitle Formatting, Filters & Editorial Controls

Advanced formatting rules ensure readable on-air captions that meet broadcast editorial standards. Includes custom dictionaries, filler-word removal, segmentation rules, punctuation & casing correction, and multiple caption display modes such as pop-on, rolling line (“snake”), and multi-line layouts.

Integration Into Broadcast Workflows

Seamlessly integrates into live production and playout environments with support for Pixel Power, BroadStream, Evertz, and Newfor systems. Compatible with both SDI and SMPTE 2110/IP broadcast workflows, with output options for Teletext subtitles (via Newfor) and TTML/EBU-TT-D for linear TV distribution.

The solution can operate at the production or playout stage and supports automated or human-assisted captioning workflows, including integration with existing respeaker operations where required.

Deployment & Architecture Options

The Txtplay application is installed on-premises within the broadcaster’s environment, ensuring full control over audio ingest, processing, latency, and subtitle output. The ASR engine can run in the cloud or on-prem, enabling hybrid setups (Txtplay on-prem + ASR in cloud) or full on-prem deployments for air-gapped or high-security operations.

Looking for technical documentation?
Review the Full Broadcast Technical Overview →

Schedule a demo

Thank you for your interest in Txtplay’s Broadcast Live Captioning solution for Linear TV. Provide your details and our team will follow up to schedule a technical demo aligned with your production and playout environment.

Ibb Lampic Aaltonen
Customer Success Manager

What can I expect?

  • High-accuracy, low-latency captioning tailored for live news, sports, and 24/7 playout.

  • Output options for Teletext subtitles (Newfor) and TTML/EBU-TT-D for linear TV distribution.

  • Compatible with SDI and SMPTE 2110/IP architectures, including encoder-based insertion.

  • Integrates with Pixel Power, BroadStream, Evertz, and Newfor systems within production and playout chains.

  • Deployment available as hybrid or full on-prem, aligned with broadcaster IT and security requirements.

  • Structured onboarding with engineering evaluation, testing, and pricing guidance.

  • Selected by leading broadcasters for real-time captioning in news and sports environments.

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