Control without the clutter.
Guided service configuration, inline help and reusable subtitle presets. Import and export service definitions for repeatable deployments.
BROADCAST INTELLIGENCE / TELLME
Every word.
On air.
Turn live speech into broadcast subtitles.
From SDI or IP to DVB, teletext and CEA-708 closed captions — with the timing, visibility and control your operation needs.
ON AIRWORLD NEWS / HDCC
A wider world.
A shared conversation.
A shared conversation.
SUBTITLE SAFE AREA
Every story deserves
to be understood.
to be understood.
Illustrative subtitle preview
One signal. More understanding.
BUILT FOR THE BROADCAST CHAINLive transcription+Translation+Subtitle encoding+TS multiplexing
01 / FROM SIGNAL TO SCREEN
Your signal.
One connected workflow.
Keep your broadcast infrastructure.
Add a dedicated layer for speech, subtitles and operational control.
FLEXIBLE INPUT
Start with the source you already have.
De-embed PCM audio from supported DekTec SDI hardware, or select an audio PID from an IP MPEG-TS source. With SDI, TellMe handles audio; your external encoder continues to handle video.
- SDI video standard and signal visibility
- Audio group / pair selection
- IP input probing and audio PID selection
02 / THE OPERATOR’S VIEW
Complex underneath.
Clear on the surface.
See the whole chain. Inspect the component.
Change what you need — without losing the bigger picture.
Actual TellMe UI, captured in an isolated demo instance. Channel names, status and telemetry are illustrative, not performance measurements.
See beyond “running”.
Inspect input signal, ASR timing, subtitle output and MUX counters. Distinguish a running process from an active data path.
Keep operators in control.
Admin, operator and viewer roles. Component-level restart controls and an API subtitle gate for commercial breaks.
03 / MADE TO BE READ
Live pace.
Film-like phrases.
Your presentation.
Choose rolling captions for continuous speech, or complete-phrase presentation for a different viewing rhythm. Shape the region, font and size in Subtitle Designer, then save the look as a preset.
Explore service settings ↗CAPTION STUDIOINTERACTIVE EXAMPLE
A new perspective.
A clearer conversation.
A clearer conversation.
Browser illustration only. The product’s native preview is the reference for actual DVB rendering and line capacity.
CLOSED CAPTIONS / BUILT INTO THE SIGNAL
More than a subtitle track.
Part of the picture’s data.
CEA-708 closed captions for encoded H.264 and H.265 / HEVC programmes. No video transcoding.
A dedicated caption encoder.
Independent caption layout, with one- or two-row presentation, incremental text updates and configurable position, pen size, colors and background opacity. DVB bitmap and teletext keep their own layouts.
A broader character repertoire.
Optional extended character handling through P16 alongside the standard CEA-708 character sets. Character coverage depends on the configured encoder profile and receiver implementation; it is not a promise of universal Unicode support.
Insert captions. Keep the video.
The integrated MUX inserts caption data into SEI messages in the encoded video stream. A bounded CC frame buffer supports injection; caption-specific buffering is enabled only when CC is enabled.
RECEIVER COMPATIBILITY
Caption positioning, size, colors and extended characters may render differently across TVs and players. Verify your target receivers and any HLS packaging chain. TellMe’s integrated MUX is required for CC injection; the external-MUX subtitle TS path remains available for DVB and teletext.
04 / TIMING IS PART OF THE PRODUCT
Words belong
with the moment.
Encoding takes time. Recognition takes time. TellMe gives you tools to understand the difference — and configure the subtitle timing budget deliberately.
Dynamic audio correlation
Match direct SDI PCM against decoded programme audio to estimate encoder latency. Smooth the estimate; hold the last stable value and warn when correlation is lost.
Smart PTS Sync
Observe matching compressed audio on input and programme reference. Measure timing reserve and recommend a delay — without automatically changing timestamps or MUX delay.
Manual timing remains available. Translation may need a larger delay budget. Actual latency depends on the source, model and broadcast chain.
05 / ENGINEERING DETAILS
Broadcast-native.
Integration-minded.
Ingest & recognition
- IP input
- MPEG-TS over UDP / multicast; audio PID and interface selection
- SDI input
- Supported DekTec hardware; embedded audio group / pair selection
- Audio path
- PCM extraction / decoding; shared capture for translation sessions
- ASR controls
- Language hints, context, speaker diarization, endpointing and session rotation
Subtitles & languages
- Formats
- DVB bitmap, original-language teletext and CEA-708 closed captions
- CC encoding
- Dedicated CEA-708 encoder; optional Extended P16 character profile
- Presentation
- Rolling or phrase mode; font, region and layout presets
- Rendering
- Legacy compatibility and extended anti-aliased bitmap modes
- Translation
- Licensed additional languages, each with a DVB track, PID and language descriptor
- Accessibility
- Normal / Hearing impaired signalling; does not generate sound descriptions
Transport & timing
- Integrated MUX
- Subtitle injection into an already encoded MPEG-TS programme; no video re-encoding
- CC injection
- H.264 / HEVC SEI insertion through the integrated MUX, without video transcoding
- External MUX
- DVB / teletext subtitle TS via a selected interface; external programme timing reference
- Timing controls
- MUX delay, subtitle offset and programme audio reference
- Protection
- Input PID collision checks and runtime subtitle injection guard
Operations & deployment
- Host
- Ubuntu amd64 package; separate optional DekTec hardware package
- Administration
- HTTPS web UI, role-based access and licensed channel / translation limits
- Lifecycle
- Supervised components, recovery policies and transactional configuration apply
- Diagnostics
- Technical telemetry, bounded logs, SDI events and component inspection
DEPLOYMENT NOTE
The control and media components run on your server. Speech recognition and translation require connectivity to the external ASR engine. SDI requires compatible hardware; channel capacity and translation availability depend on the installation’s license and resources.
GOOD QUESTIONS / STRAIGHT ANSWERS
Before you go on air.
Does TellMe encode my video?+
No. TellMe extracts or decodes audio for recognition and generates subtitle streams. Its integrated MUX inserts subtitles into an already encoded programme. In an SDI workflow, your external encoder remains responsible for video encoding.
Can I use my existing multiplexer?+
Yes, for DVB and teletext. CEA-708 SEI injection requires TellMe’s integrated MUX. For the external-MUX workflow, disable the integrated MUX, send the subtitle TS over your selected interface and configure the external programme reference. Your external MUX must map the subtitle PIDs and publish the appropriate descriptors.
What happens during a commercial break?+
The subtitle control API can stop and resume subtitle output without stopping ASR or the programme MUX. The SUBs indicator reflects the output gate state in the control plane.
How do translation tracks work?+
Original subtitles are retained. Enabled target languages receive individual DVB bitmap tracks, PIDs and page descriptors. The first translation shares the original recognition session; additional translations use additional sessions. Original-language teletext is unchanged.
Is there a guaranteed latency or channel count?+
No single figure fits every broadcast. Recognition, translation, source timing and the receiving chain all matter. Validate representative audio and your actual receivers, then size the server and timing budget for the intended licensed workload.
LET’S BUILD YOUR WORKFLOW
Your broadcast.
Understood.
Bring your signal format, channel count and language requirements.
Let’s shape a TellMe deployment around them.