CaptionSync by AST

Automatic Sync Technologies leverages leading-edge technology and professional transcribers to power CaptionSync; a web-based solution for generating captions, transcripts and search metadata.


Features & Benefits

  • Accessibility: Captioned video is accessible to a wider audience, including those who are deaf or hard of hearing, and those who speak English as a second language.

  • Improved Indexing and Searching: Use captions or transcripts as meta data to make your video text-searchable, and to make web-embedded video search engine friendly.

  • Viewer Flexibility: With the increasing popularity of mobile devices, viewers may be in environments where access to the audio is limited. Captioning allows them to view content whether they are in the library, at a concert or on a noisy bus.

  • Improved Comprehension: Captioning improves comprehension and retention of media content for all viewers.

  • Localization: Subtitles are an important way to localize your content for other languages; AST can show you how to reach audiences around the world.

  • Simple Workflow: Using the AST-Kaltura integration, adding captions to your Kaltura videos requires only a few clicks of the mouse. File transfers are completely automated.


  • Service fees based on minutes of video processed

  • Discounts available for education clients, clients purchasing from GSA schedule, and bulk purchases.

  • Call 877-AST-SYNC, or visit us online at for details.


Automatic Sync Technologies (AST) provides high quality transcripts, captions, and subtitles for a wide variety of media. AST was initially funded by the US Department of Education to provide a robust, fast, simple, and inexpensive solution for captioning large quantities of media. We have been providing captioning and subtitling services for almost 10 years, and our clients cover the full spectrum, including educational institutions, government agencies, and corporations. AST uses trained human stenographers to generate transcripts, avoiding the high error rates inherent in automated speech recognition systems. Our focus on quality and client service is second to none.

AST generates a wide variety of caption output file formats for use in web video, mobile devices, DVD authoring, Broadcast captioning, SEO, and video search. Our outputs are compatible with a range of systems, including many video hosting platforms and lecture capture systems. Our service allows you to select additional caption outputs as well, allowing you to create captions for other distribution formats of your video (DVD, mobile devices, iTunes, etc).

Want to get more value from your captioning efforts? AST will show you how to leverage your caption files for SEO, video search, and localization.

Installation Guide

CaptionSync runs as a web-based service, and automates your captioning and transcription workflows by linking your Kaltura account and your CaptionSync account using the Kaltura APIs. Download Tutorial-Kaltura-Integration.pdf for complete setup steps, or visit to get started.

Application Specifications

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Kaltura Edition:

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Kaltura version:

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Kaltura API version:


Available languages:


Prerequisites & Requirements

CaptionSync is a platform-independent web-based application that can be used with most modern web browsers, including Firefox, Safari, Google Chrome, and Internet Explorer. Our FAQ answers most questions about requirements. When you are ready to create an account, you can do so from our Getting Started page. Once you have created an account, contact us at and we will help you set up the automated workflow most appropriate for your Kaltura implementation.

Support Options

Support Phone:

+1 877 278 7962

Support Email:

Support Forum:

Application support forum

Support Details

If you contact us by email or phone, please be sure to include your CaptionSync account ID. If you are referencing specific jobs, please include the AST ID so that we can properly research your query. We will attempt to answer your question within four business hours during our hours of business — Monday through Friday 8:00am to 8:00pm Central Time.

Developer Resources

Source Code License

Source Code Repository

Additional notes from the application creator

Application Provider Logo

Provider Details


Automatic Sync Technologies





Automatic Sync Technologies

About the application provider

Automatic Sync Technologies (AST) leverages leading-edge technology and professional transcribers to power its CaptionSync service; a fast and simple web-based solution for generating closed captions, transcripts and video search data at a great price, without the error rates found in speech recognition.
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