Kaltura: Find and Edit Captions

When videos are uploaded to Kaltura in Canvas or in MediaSpace, they are automatically captioned using automatic speech recognition (ASR). 

On August 13, 2019, Kaltura's closed captioning engine was upgraded to include machine auto-generated captions that more accurately match what was spoken in the video. However, it is still important to review your captions for accuracy. Editing captions in either Kaltura in Canvas or MediaSpace updates captions in both locations.

Note: Speakers are assumed to be conversing in English, but video owners can re-run the automatic captioning process for other languages as well. For more information, go to Automatic Captions for Languages Other Than English.

Note: To manage captions on videos uploaded before August 13, 2019, go to Auto-Generated Captions for Older Content.

Finding Your Video's Captions

  1. Go to Canvas (canvas.umn.edu) or Kaltura MediaSpace (mediaspace.umn.edu). You may need to sign in.
    • If you go to Canvas, continue to step 2.
    • If you go to MediaSpace, go to step 3.
  2. Find your media in canvas:
    1. Click the Courses icon canvas-course-icon.pngx in the left navigation bar.
    2. Select the course you want.
    3. Click My Media from the course navigation menu on the left. If the My Media link is not shown, the course's owner can add it by following the instructions in Adding Kaltura Course Tools to Canvas.
  3. Find the video you want to add a caption file to and click the edit icon canvas-edit-pencil.pngx located to the right of the video.
  4. Select the Captions tab under the video.
  5. Click the Edit Captions button.

Understanding the Caption Editor Features

The video editor has several components. The left side of the Closed Captions Editor contains the captions assigned to your video. The right side is a preview of your video with your captions applied. 

Closed captions editor. Captions are highlighted and overlaying the video at the same time.

  • Captions dropdown menu: If you have multiple caption files, you can choose the file you wish to edit.
  • Search in Captions: Find specific words or phrases within your caption file.
    • Replace with: Search for and replace words one-for-one with a new word.
      1. Type a word into the search bar to find instances of it in your captions.
      2. Enter a replacement word or phrase into the Replace With field.
      3. Click Replace.
  • Add Speaker: Use to label a speaker for a given portion of your captions.
    1. Click the checkbox(es) located to the left of timestamps in the Captions Content Editor.
    2. Type the speaker's name in the Add Speaker field.
    3. Click Add.
      Kaltura caption editor. Add speaker field filled out with the name Bernie. Caption entry highlighted with the name tagged into entry.
  • Video Preview Player: Use the preview player to see the captioned video.
    • Explore the video using the 5-second skip button.
    • Check Autoscroll to highlight the current caption section in the Caption Content Editor as the video plays.

Editing Your Video's Captions

  1. Find the block of text containing the caption you want to edit. If you haven't edited the captions at all, start at the beginning.
  2. Select the Play icon canvas-caption-play.pngx under your video to start it. The captions are highlighted in light blue as they appear on the video.
  3. In each block of text, watch the video clip to check for accuracy and timing.  For more detailed caption editing instructions, go to Video: Guidelines for Editing Auto-Generated Captions.
    • As you edit, the video will stop.
    • The editor will adjust the video to match the text.
    • Ensure natural flow of speech by checking for correct punctuation and spelling.
    • Good practice is to have around 32 characters per line.
  4. Edit your blocks of text. Total characters per chunked text appear in the bottom-right corner.
    Canvas caption editor. Chunk of text is selected. Total characters is highlighted.
    • Break the captions into chunks of 64 characters or less.
    • Copy text from one chunk and paste it into the one below it to adjust for character length as needed.
      • Make sure that the audio lines up with the text.
    • Use a maximum of two lines per chunk.
  5. You may need to add additional rows in order to meet character requirements.
    1. To add additional blocks of text, hover the cursor over the location you want to add text.
    2. Click the add row icon kaltura-add-row-icon.pngx.
      • Adding a new row copies the block of text above it and creates a new timestamp.
        Kaltura captions  editor. A block of text is copied and the new timestamp is highlighted.
    3. Edit your text, making sure that the captions continue to line up with your video. You may need to adjust the timestamp.
  6. Click Save when you are finished.
    1. A pop-up confirmation window appears. Click Yes to save, or No to return to editing.
  7. Review your captions by watching the video.