Live Captioning for Web & OTT Streaming

Currently available in 55+ languages and 100+ translations!

Web & OTT Live CC Features

AI Live Captions

Enable low-latency, AI-driven speech-to-text captioning for live streaming workflows with full support for HLS, RTMP(S), and SRT delivery paths. Txtplay processes audio in real time and outputs caption data directly to the player, ensuring consistent rendering across adaptive bitrate streams. The solution supports 55+ input languages for ASR, multi-track caption delivery, and seamless playback across browser and mobile environments. Verified compatibility with JW Player, THEOplayer, HLS.js, Video.js, Shaka Player, and other HTML5 OTT players.

‍Key capabilities:
‍Low-latency ASR for real-time captioning
55+ input languages supported
Multi-track caption output for multilingual streams
Works across HLS, RTMP(S), and SRT workflows
Optimized for HTML5 OTT players (JW, THEO, HLS.js, Video.js, Shaka)

AI Live translation

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Enable real-time AI subtitling and translation for multilingual live streaming across OTT and web-based environments. Txtplay supports over 60 source languages and 100+ target languages, routing translations through leading AI engines including DeepL, Microsoft, Amazon, and Google to maximize accuracy per language pair. Subtitle tracks are generated and delivered in parallel with the live stream, ensuring synchronized multi-language subtitle output across adaptive bitrate workflows. Supports standard subtitle formats such as WebVTT, CEA-608/708, and more.

Key capabilities:
‍55+ input and 100+ output languages for AI-powered subtitles
Integrates with DeepL, Microsoft, Amazon, and Google translation engines
Parallel multi-language subtitle track generation for live streams
Works across HLS, RTMP(S), and SRT workflows
Output in WebVTT, CEA-608/708, and more

AI Live dubbing

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Deliver lifelike multilingual audio for live streams with AI-powered voice localization designed for OTT, hybrid, and broadcast environments. Txtplay generates natural-sounding translated audio in real time, matching or exceeding the speed of traditional human interpreters. The system automatically identifies each speaker and assigns an appropriate synthetic voice that reflects their gender, tone, and vocal presence, creating a more engaging and realistic listening experience across languages. Our Vocalics emotion-aware voice cloning technology preserves expressive qualities such as tone, pitch, accent, and speaking rhythm — ensuring that the original emotional intent is carried across languages. Fully cloud-based and hardware-free, Txtplay integrates seamlessly into live streaming workflows and supports HLS, SRT, and CMAF ingest, with optimization for AWS Elemental environments.

Key capabilities:
‍Real-time AI voice localization in 50+ target languages
Speech delivery matching or exceeding human interpreter speed
Automatic speaker identification with intelligent voice assignment
Vocalics emotion-aware voice cloning retains tone, pitch, accent, and rhythm
Cloud-based, hardware-free scaling for global live events
Seamless integration via HLS, SRT, and CMAF ingest
Ideal for news, sports, conferences, OTT platforms, hybrid events, and live broadcasts

Schedule a demo

Thanks for your interest in Txtplay’s Live Captioning for Web & OTT Streaming. Fill in your details and we’ll get back to you shortly to schedule a tailored demo.

Ibb Lampic Aaltonen

Customer Success Manager

What can I expect?

Industry-leading accuracy powered by advanced AI, enhanced with custom dictionaries for names and domain terminology.
Live translation of captions into 100+ languages for global audiences.
AI live dubbing with human-like voices in 50+ languages, cloud-based and real time.
Seamless integrations with leading OVPs and streaming workflows (HLS/RTMP(S)/SRT, standard HTML5 players).
Fast onboarding and clear next steps for testing, pricing, and deployment.

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