Overview

Kaltura automatically generates "machine captions" for every entry (also known as "ASR captions"), but these are only about 70-90% accurate on average. With that in mind, we strongly recommend editing your video's captions to ensure their accuracy. There's no doubt, however, that editing captions can be time-consuming. In this knowledge base article, we try to provide advice on how to edit captions and transcripts as expeditiously as possible. 

Critical Concepts

• In order to edit captions in Kaltura, you must be the media entry's owner or a co-editor. While it would be great to crowdsource caption editing, Kaltura requires that users have an owner or co-editor role in order to make changes to the captions. If you want to learn more about the co-editor role, check out our KBA titled Add Collaborators to Kaltura Media.
• Check out our other KBAs for the more technical "how to's" about Kaltura captions.
  • Edit Captions on the Web for a Kaltura Video
  • Edit Captions on Your Computer for a Kaltura Video
  • Request Machine Captions for Kaltura Media
  • Convert a Text Transcript to Captions for a Kaltura Video
  • Hide Captions from the Kaltura Player
  • Delete Captions from a Kaltura Entry

Steps to Take

Below are the steps we recommend you take when you want to edit captions for a Kaltura media entry. Use the links to jump down and learn more.

• Edit the transcript instead of the captions
• Edit on your computer rather than on the web
• Leverage speed controls
• Leverage peripherals with play/pause buttons
• Leverage collaborators

Edit the Transcript Instead of the Captions

1
00:00:05,150 --> 00:00:06,735
Hello.

2
00:00:06,735 --> 00:00:08,400
Today we're gonna be
teaching you how to

3
00:00:08,400 --> 00:00:10,140
record a PowerPoint
presentation with…

If you want to edit the words spoken in your video, we strongly recommend editing the transcript and not the captions. It may help, then, to draw a distinction between captions and transcripts. Caption files are meant to tell a video player when text should be visible on the screen and, as a result, have timecodes in them. A transcript, however, is a text file that only contains text, without any time codes. Because of this difference, it can be slightly more annoying to edit a caption file since you have to navigate your way around the timecodes in order to edit the text, at least if you're downloading the file and editing it on your computer.

Editing the transcript has another benefit, and it's related to the principles of Universal Design for Learning (an instructional design framework focused on universal accessibility rather than individual accommodation): editing the transcript allows you to create a text version of your video, especially if you add logical paragraph breaks. Depending on the content of your video, you could offer the edited transcript as a text-based alternative to students who would prefer not to watch the video. If you do intend to offer it as an alternative, however, you must ensure that this document has equivalent educational content to the video. It can't be better or worse to consume one or the other.

If you edit the transcript, you'll want to be familiar with Kaltura's "machine alignment" workflow. This feature allows you to upload a transcript and have Kaltura generate the timing / captions.

Edit on Your Computer Rather Than on the Web

Kaltura does offer a web-based caption editor and it does have a handful of handy features. Clicking on a caption, for example, will bring you to that point in the video player. Ultimately, however, we find it much easier to edit captions and transcripts using local software on your computer, such as WordPad or TextEdit. "Find and replace" functionality can come in handy for multiple instances of misspelled words, and editing a text document on your computer requires much less clicking than when editing on the web. And as anyone who uses a computer frequently knows, the more you have to switch back and forth between your mouse and keyboard, the slower a task generally becomes.

As we mentioned above, we recommend editing the transcript rather than the captions, but if you prefer to focus on the captions, check out our documentation on how to edit captions on your computer.

Leverage Speed Controls

Playing a video more quickly or slowly can help when you’re editing your captions, depending how fast you can type and how many edits you need to make. The Kaltura video player, for example, offers you the ability to change the speed of the playback by clicking the gear icon within the player, then clicking the speed pull-down menu to select your desired playback speed. Consider lowering the speed of playback to make it easier to edit without having to pause as frequently, or speeding it up if the machine captions are often accurate (or if you're a fast typist).

Leverage Peripherals With Play/Pause Buttons

Unless you're a court transcriptionist, you probably can't always make all of your edits while the video is still playing. You'll probably be pausing every now and again. And if you're switching between applications, windows, or frames to have to pause your video, that will slow the process down. Accordingly, if you have headphones, a keyboard, or any other device with a play/pause button that's easy for you to access, leverage it while editing your captions.

Leverage Collaborators

As mentioned above, editing captions is time-consuming. Is there anyone who can help? A grad student? Your TA? A student worker in your department? All you'd need to do is add them as a co-editor for your video and they can either edit the captions in Canvas or in MediaSpace. Read our tutorial on adding collaborators to learn more about adding co-editors to your videos.