Canvas Accessibility: Edit Kaltura Closed Captions

All videos uploaded to your Kaltura 'My Media' will receive automatic closed captions and transcripts. Use the Kaltura Captions Editor to improve the accuracy of automatic captions. Note that automatic captions are limited to English and Spanish.

To get started, add new media to Kaltura My Mediaand wait for the captions file to finish processing.


People with hearing loss depend on media with highly accurate closed captions (approximately 99%). Kaltura provides automatic machine-generated closed captions for all videos uploaded. However, automatic captions and transcripts are only roughly 80% accurate, well below the threshold of accessibility. Use the Kaltura Captions Editor to improve the accuracy of automatic closed captions.

Universal Design

There are numerous ways closed captions benefit everyone, including:

  • Improved note taking
  • Improved attention
  • ESL support

Step 1: Locate the Caption File

  • Login to Canvas and open any course.
  • Select the My Media link in the course navigation menu.
  • Find the video you’d like to edit, then select the Edit video icon (shaped like a pencil).
    The Kaltura 'My Media' interface in Canvas with the 'Edit video' button selected.
  • On the following page, select the Captions tab.
  • A table containing the SRT caption file and Actions will be available.
    Kaltura 'My Media' interface with 'Captions' tab selected.

Step 2: Edit the Captions with the Kaltura Captions Editor

Note: If you prefer, you can download the caption file, edit it, and re-upload it to Kaltura (see next section).

  • Select the Edit Captions button.
    'Edit' Captions button in Kaltura interface.
  • On the following Closed Captions Editor page, you will find a main column with captions. 
    • There are time markers adjacent to each caption, indicating where captions appear in the video.
  • Simply select the caption you’d like to edit and make any changes needed.
  • Use the preview player to play back the current caption selection to confirm readability.
  • Use tools like Search and Replace to streamline the process.
  • In addition to spelling, keep the following in mind when editing captions:
    • Capitalization
    • Punctuation
    • Speaker identification
    • Important non-verbal sounds
  • When you are finished, select the Save button. 
    • If you make any major errors while editing, there is a Revert button.
      Kaltura caption editor with captions, preview player, 'Save' button and other tools highlighted.

Step 3: Download the Captions File, Edit, and Upload

  • Rather than selecting the Edit Captions button, select the Download button in the column labeled Actions.
  • The file will download to your computer in the .srt format.
  • Open the .srt file in any text editing application (i.e. Notepad for Windows, TextEdit for Mac)
  • Make any edits needed and save the changes.
  • Select the Upload captions file button, then select the .srt file that you edited and saved.
  • Set the new caption file as the default, or delete the previous, unedited file.
    'Download' and 'Upload Captions File' option selected below the 'Captions' tab in the Kaltura interface.

Additional Resources

Keywords:Kaltura, a11y, accessibility, closed captions, udl, universal design, Canvas, video, My Media   Doc ID:101417
Owner:John W.Group:Rice University
Created:2020-04-24 15:37 CDTUpdated:2020-08-17 09:57 CDT
Sites:Rice University
Feedback:  6   6