MarketplaceListingsCustom ActivityLive Caption Translator

Live Caption Translator

Bronze Certified

Custom Activity

0 reviews


Live Caption Translator

Bronze Certified

Custom Activity

0 reviews



It converts audio data from video and web conferences into text and displays the subtitles on the screen. It also has a translation function, so you can display subtitles in your native language.


There are three activities in this package.

- Speech To Text Streaming Scope
- Start Streaming Recognize
- Stop Streaming Recognize


This package provide voice recognition and translation by using IBM Watson SpeechToText and LanguageTranslator Service.
It sends a PC speaker output to IBM Watson cognitive service, gets voice recognition results as text in real time and you have the option to choose whether to translate it or not.
It also exports the file to take the minites book as option.
Due to the self-restraint by COVID-19, I have developed it so that you can freely and comfortably watch video content and webinars in various languages around the world.
Therefore, it does not recognize the microphone input, only the speaker output.

Supported web conferencing tools

Supports all web conferencing tools, including video content such as Microsoft Teams, Skype, Zoom, Cisco Webex, YouTube, etc.

To use the service, you need to register for a free IBM Cloud Lite account.

IBM Watson Cognitive Services are available with an IBM Cloud Lite Account, which is a service that allows you to use many APIs and services, including Watson, for an unlimited period of time for free, without the need for a credit card. The cognitive service we will use this time is also available for free, so we will use this account. (There is a limit to the free usage, but you will not be charged for it.

For more information on how to register for an IBMCloud Lite account and how to implement a workflow, please refer to the following


Webinars in other languages can be viewed with subtitles in the native language.
For those who are hearing impaired, supports web conference participation by displaying subtitles.

Published: 13 Sep 2021 | Updated: 13 Sep 2021

Masaaki Yoshida
UiPath Japan MVP 2020 - 2021

Tokyo, Japan



Code Language

C#, Visual Basic


Windows Legacy (.Net Framework 4.6.1)




Studio: 2019.10 - 2021.6


IBM.Watson.LanguageTranslator.v3 >=4.3.1 IBM.Watson.SpeechToText.v1 >=4.3.1 NAudio >=1.10.0

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