Topics in this article include:

About Kaltura Captions

Auto Captioning

Add Captions to Previously Uploaded Content

Review and Edit Captions



About Kaltura Captions

Kaltura Media has the ability to automatically add captions to your video content using automatic speech recognition (ASR). When a video is uploaded, the ASR processes begins immediately. Captions are created based on the audio track and the content is assumed to be in English. However, video owners can run the captions in other languages.


ASR captions are only 80% accurate and accuracy may vary depending on the audio quality, clarity of speech, background noise, etc. We recommend using the ASR captions as a starting point - you will want to edit them for accuracy.



Auto Captioning

All videos created after August 6, 2018 will be auto-captioned. Once you create your video or upload your video to Kaltura, ASR captions will be automatically ordered and applied to your video. The process may take several minutes to several hours, depending on the length of your video.



Add Captions to Previously Uploaded Content

To request captioning for older videos, go to your Kaltura My Media and locate your video. Click on the video or the video title to open.

screenshot of Kaltura My Media



Click on the Actions button below the video. This will open a menu.

screenshot of the Actions button



Select Order Captions.

Screenshot of Actions menu



Select your captions language (the language being spoken in the video) and click the Order Captions button.

screenshot of order captions button



Your captions will be ordered. The process may take several minutes to several hours, depending on the length of your video.



Review and Edit Captions

ASR captions are only 80% accurate and accuracy may vary depending on the audio quality, clarity of speech, background noise, etc. We recommend using the ASR captions as a starting point - you will want to edit them for accuracy.


To review your caption files, go to your Kaltura My Media and locate your video. Click on the video or the video title to open.

screenshot of video in Kaltura My Media



Click on the Actions button below the video. This will open a menu.

screenshot of Actions button below the video



Select Caption Requests.

Screenshot of Actions menu


This will bring up to a list of the caption requests for this video. Select your caption request and click the Edit button.

screenshot of captions requests list



This will launch a new window and display the caption editor. The caption editor contains three panes:

  • The Left Pane contains the transcript
  • The Center Pane contains the player controls and the editor
  • The Right Pane contains help information, including hotkeys and sound tags


screenshot of caption editor tool



Review your captions. You can control the playback with the controls in the center pane.


screenshot of playback controls in center pane



To edit your captions, find the block of text in the Left Pane containing the caption you wish to edit. Then click on the block of text to select it. The block will turn yellow and that text will appear under the player controls in the Center Pane.


screenshot of editing captions



To edit the captions while the video plays: 

  • Press the Play button. 
  • Move the cursor to the text you want to edit and type the change. 
  • The video will pause while you type and resume when you finish typing. 


To edit the captions while the video is paused: 

  • Press the pause button. 
  • Move the cursor to the text you want to edit and type the change. 
  • If you press play again, the video playback will begin after the cursor.


Once you have finished with all of your edits, click Approve below the text editor.

screenshot of approve button



A popup window will open asking you to approve the job or cancel to return to editing. Click Approve to approve the caption files. Please note that you can always go back and edit at a later time.

screenshot of Approve job popu



Once you have approved the captions, you will be prompted to close the browser window/tab. You may then return to your Kaltura My Media. When you play your video, your edited captions will play.