About

Kaltura's captions editor lets you review and edit captions for your videos, whether they were generated by REACH or uploaded manually.

You can:

• Edit caption text
• Adjust caption timing
• Update speaker names
• Search and replace text
• Review captions alongside video playback

If the transcript widget is enabled, changes made in the captions editor are automatically reflected in the transcript.

The captions editor is particularly useful for reviewing and improving machine-generated captions.

Access Content Lab

Steps for accessing the Content Lab vary depending on the Kaltura application. 

Rich Media CMS - 

Access the Content Lab through the Create with content lab button on the Entries list or on the Entry Details page. 

Legacy Video Portal - 

Access the Content Lab through the Create with content lab button on the Media page. 

Kaltura Events - Access the Content Lab through the Create with content lab button on the Edit session page or the Edit media page. 

LMS Video - Access the Content Lab through the Create with content lab button on the Media page. 

Content Lab overview

The appearance of the Content Lab varies depending on the Kaltura application. 

Rich Media CMS - 

After clicking the Create with Content Lab button on the Entries list or on the Entry Details page in Rich Media CMS, the 'Get more from your video' screen displays.

Legacy Video Portal, Kaltura Events, and LMS Video - 

After clicking the Create with Content Lab button on -

• the Media page in legacy Video Portal
• the Edit session page or the Edit media page on Kaltura Events
• the Media page in LMS Video

the 'Create with AI screen' displays. Here's one example from the list above - accessing the Content Lab through the Create with Content Lab button on the Media page in legacy Video Portal: 

Launch the editor 

1. Navigate to the Content Lab's main menu.



Options shown vary depending on the services configured for your account.

2. Click Captions & Translations.



The Captions orders screen displays.



3. Locate the desired captions request with a Ready status.
4. Click the three dots next to the request and select Launch editor.



5. The closed captions editor opens.

Editor layout

The editor includes two main areas:

• Captions panel – Displays caption lines and editing tools
• Player panel – Displays the video for real-time preview

When you select a caption line, the player jumps to the relevant point in the video. The selected caption is also displayed below the player, allowing you to preview it in context while editing.

Captions panel 

The captions panel includes:

• Captions dropdown – Select a different caption file if multiple files exist
• Edit details – Update caption language, accuracy, and label
• Search – Enter a term and press Enter to highlight matches
• Replace – Find and replace text across captions
• Add speaker – Add speaker names to selected rows
• Autoscroll – Automatically scroll captions during playback
• Delete caption – Delete a caption line (available on hover)
• Add caption – Add a new caption line (available on hover)
• Timestamp – Edit start and end times

The editor uses SMPTE time format (hh:mm:ss,mmm) for precise timing.

• Caption text – Edit the caption content

Player panel 

The player panel lets you preview captions alongside the video.

• Playback controls and keyboard shortcuts help you fine-tune caption timing and align captions with audio and visuals
• Selecting a caption line moves the player to the correct timestamp
• The active caption is displayed below the player for easy reference during editing

Edit caption details

1. Click Edit details. 



The 'Edit caption details' window opens.

2. Update the caption's language, accuracy, and label.



3. Click Save.
Changes are applied immediately.

Find and replace text

1. Click Replace. 



2. Enter the search term in the Find match field. 
3. Enter the replacement term in the Replace with field.



4. Click Replace.
5. Click Save.

You are asked to confirm captions accuracy.



6. Move the slider accordingly, then click Save.
The search term is replaced immediately.

Add speaker names

1. Select the row(s) where you want to add the speakers, then click Add speaker.
2. In the 'Speaker name' field, type the name.



3. Click Add Speaker.
The name is added to the selected captions.



4. Click Save.
You are asked to confirm captions accuracy.



5. Move the slider accordingly, then click Save.  
The information is immediately updated.

Add a caption line

1. Hover over a caption row and click + Add caption.



The caption is duplicated.



2. Click the text field and enter the new caption.

Adjust timing as needed. Overlapping timestamps are highlighted for correction.



3.  Click Save.
You are asked to confirm captions accuracy.



4. Move the slider accordingly, then click Save.
The information is immediately updated.

Edit a caption line

1. Click a caption line.
2. Update the text as needed.



3. Click Save.



You are asked to confirm captions accuracy.



4. Move the slider accordingly, then click Save.
The information is immediately updated.

Revert or save changes

• Revert restores the last saved version
• Save applies your changes

Keyboard shortcuts  

• Player seek 5S backwards = Ctrl <-
• Player seek 2S backwards = <-
• Player seek to 0 = Home and in Mac Command <-
• Player pause-play toggle = space 
• Player seek 5S forward = Ctrl ->
• Player seek 2S forward = ->