Kaltura (Captioning) - Adding and Editing Captions

Kaltura provides an automatic captioning system for uploaded videos. If you are the video owner or you have been added as a co-editor for the video, then you can also edit captions manually. This guide will provide the procedure for doing so.

Requesting Captions

Here is how you request machine-generated captions for your videos:

1) Go to Kaltura's "My Media"

1a) In Canvas, go to Canvas > Account > My Media
1b) In Mediaspace, go to Guest > Login, then [Your Name] > My Media.

Your Name, then My Media.

2) In My Media, select a video from your list of videos.

3) In the drop-down menu below the preview of the video, click Actions > Captions Requests.

Actions menu, with Captions Requests selected.

4) Under Order Captions, select:
  • Service: Machine
  • Source Media Language: English [or other language, as needed]
  • Feature: Captions.

Order Captions menu, with Service: Machine, Source Media Language: English, and Feature: Captions selected.

5) Click Submit.

The resulting screen will show you all of your previous captions requests for that video. You can get back to this Captions Requests screen by going to Actions > Captions Requests.

Captions Requests screen table with one Pending request.

Editing Captions

Machine-generated captions often require manual cleanup before the quality is high enough to meet accessibility standards. Here is how you edit your videos' machine-generated captions:

1) Go to Kaltura's "My Media"

1a) In Canvas, go to Canvas > Account > My Media
1b) In Mediaspace, go to Guest > Login, then [Your Name] > My Media.

Your Name, then My Media.

2) In My Media, select a video from your list of videos.

3) In the drop-down menu below the preview of the video, click Actions > Captions Requests.

Actions menu, with Captions Requests selected.

4) On the Captions Requests screen, click the pencil (Edit) icon to edit your captions. 

Captions Requests screen, describing each caption request which has been made for a video. Click the penci/edit icon.


5) On the Closed Captions Editor screen, you can make changes and correct errors in the machine-generated captions. Common errors include garbled words, typos, and incorrect proper names.

Closed Captions Editor screen, with each captions segment in a row on the left and a preview of the video on the right.

For detailed instructions on using the Closed Captions Editor, see Kaltura's How to Edit Captions video, starting around the 0:50 second mark:



Key features of the Closed Captions Editor include:

The Closed Captions Editor page includes the followng key features: search and replace, Add Speaker, timestamp and content editor, and video preview.

A: Search and Replace

Search for specific text strings within the caption file. Use Replace to swap out one text string for another throughout the captions file.

B: Add Speaker

Lets you designate who is speaking during a particular section of the captions. To add a speaker, check the box next to one (or several) caption sections in the Content Editor (below), then type a name in the Add speaker to selected items field and click Add.

C: Timestamp and Content Editor

This is the heart of the Closed Captions Editor. Use this to edit each chunk of text in the captions and determine when that chunk of captions will be displayed. If you create timestamps which overlap, the editor will highlight the overlapping timestamps.

D: Video Preview 

Lets you play and pause the video as you're editing captions. Checking Autoscroll will cause the captions sections in the Content Editor (above) to scroll as the video plays.

6) Once you've made the edits you want, click Save.

Please note: captions changes may take up to 24 hours to show up in Canvas or Mediaspace.