If you have a piece of media that has audio narration, you should provide a written text version as an alternative for hearing-impaired users. If suitable, you can create a transcript as a separate link under the video in your unit, which can be as simple as a Page resource with your transcript text as the content of the page.

Alternatively, you can add captions to your Kaltura video by uploading an SRT file as part of your Kaltura media. An SRT file is a specifically formatted plain text file that contains the text to display as captions when they are turned on by the user.

How to create an SRT file

An SRT file is a basic plain text file. On Windows, you can create a text file by using Notepad. On Mac, you can use the Text Editor application.

The following video is an example of how captions function. Click the 'CC' button in the player to toggle captions on and off.

You can download the SRT file for this video to use as an example of how the captions are formatted.

For each caption you want to display, you need to include:

  • The caption number (sequential)
  • The Start and End timestamp
  • The text of the caption
  • A blank line

In the SRT file, a single caption may be written like this:

1 00:00:11,000 --> 00:00:20,000 This caption displays from the 11th to the 20th second. 

00:00:11,000 is formatted in HOURS:MINUTES:SECONDS, where seconds is written in milliseconds (i.e. 11 seconds is 11,000 milliseconds). This caption example displays from the 11th second mark in the video to the 20th second mark.

For any video you wish to caption, you will have to create an SRT file with each caption and the time it displays, ordered sequentially as in the linked example, then upload your SRT file with your Kaltura video (see instructions below).

Auto-generated captions

The ACU Kaltura service currently does not support auto-generated captioning. However, you can use YouTube to generate an SRT captions file that you can then download, edit, then upload to Kaltura. Note that auto-generated captions are not always accurate and you should check the transcripts carefully to correct any errors manually before uploading.

How to upload your SRT file

  1. In your Media Gallery, click the 'Edit' button for the video you wish to add an SRT file to.
  2. Under the video, click the 'Captions' tab:
  3. Click the 'Upload captions file' button. Select your SRT file to upload, choose the language it is written in, and give it a name appropriate to the language used (e.g. English). Click the 'Save' button to finish.

You should now be able to play your video with captions by pressing the 'Play' button in the video and selecting your captions by clicking the 'CC' button.

When uploaded, your captions file will be listed in this table, with some tools you may need in the Actions column:

These actions will allow you to edit, delete, and download your existing SRT files, set as the default caption, or hide from the player.

If your SRT file is not working:

SRT files must be exact, otherwise errors will occur in processing the captions. If the captions are not functioning properly, delete the SRT file, check, edit, then re-upload. You will need to check your SRT file carefully, looking for improper numbering, missing blank lines, or timestamps that are not properly formatted. If you are still having trouble, contact the LTC eLearning team at elearning.ltc@acu.edu.au.

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