Kaltura: Extract and Combine Multi-Source Recordings

In this article:

When recording in Kaltura Capture, you can record the screen and camera simultaneously. 

When playing back in the Kaltura player, viewers see these two sources combined. One source appears large in the background and the other appears in the lower right as a picture-in-picture. Viewers can: 

  • Swap the sources
  • Set the playback to be side-by-side
  • Focus on just one source

When reviewing a Kaltura recording with multiple sources outside of Kaltura, they consist of separate files. If you want to view such recordings with both sources outside of Kaltura in Canvas or Kaltura MediaSpace, such as in a PowerPoint presentation, you must extract the two sources and then merge them into one file using the steps below. 

Extracting Source Files

Option 1: Finding Source Files on Your Computer

The easiest way to find the two source files is to locate them on your computer.

Note: This is only an option if you recorded in Kaltura Capture and have not yet gone to Kaltura Capture's Manage screen and deleted the recording from your computer. 

To locate the source files on your computer:

  1. From the Kaltura Capture control panel, select Manage, then take note of the date you made the recording.
  2. Go to Kaltura Capture Folder Directory (kaltura.com) and follow the steps for Mac or Windows.
  3. Open the Recordings folder. 
  4. Using the View options on your computer, set the folder to show a list of files, sorted by date.
  5. Using the date from step 1, look for two files. Open both of them and review a couple seconds of each to verify that the files are related to the recording you want.
  6. Copy the two files to your computer's desktop. 

Option 2: Downloading Sources from Kaltura

If you do not have the recordings on your computer (Option 1 above), it is possible to download the two source files from Kaltura instead, but this process is more involved.

To locate the two source files in Kaltura:

  1. Go to mediaspace.umn.edu and locate the recording in question.
  2. To the right of the recording, select the Edit icon 
  3. On the page that appears, at the bottom left of the Kaltura player, select the Download original icon . The file of the primary source will download to your desktop.
  4. In the Basic Info box in the upper right corner, next to Media Entry ID, copy the value that appears.
    • Example value: 1_y5hvpxb9.
  5. Select My Media
  6. In the Search My Media box, paste the value you copied in step 4 above, then press the return key.
  7. Two results should appear, both with the same name. Next to the one that does not match the one you just downloaded (likely with the webcam view as the thumbnail image), select the Edit icon. 
  8. On the page that appears, in the Kaltura player, select the Download original icon again. The file of the secondary source will download to your desktop.

Another option is to follow the steps at How to download a multi-stream media? (kaltura.com).

Combining two source files using Screencast-O-Matic

After using one of the above options to download both source files, use the steps below to combine two sources into one file for playback.

  1. Download and install Screencast-O-Matic for Mac or Windows.
  2. From the main screen of Screencast-O-Matic, select Import
  3. In the file selection box, select the video you wish to appear larger (in the background).
  4. After the file is imported into Screencast-O-Matic, select it to open the detail page.
  5. In the lower right, select Edit
  6. From the Tools menu, select the Overlay submenu
    1. Select Video
  7. In the Where is your video coming from? box, select My Files.
    1. In the file selection box, select the video you wish to appear as the smaller video (picture in picture).
  8. The newly copied video will appear in the center of the editor, on top of the video you imported first. 
    • Select and drag the center of this video to move it to another area on top of the main video.
    • Select and drag the selection handles to make the new video larger or smaller. 
  9. Select Video Options.
    1. Next to Use Audio, Select Yes to change it to No, then select Done.
      • This makes it so the audio from only one of the sources plays back. If both sources include audio, there can be an echo.
  10. In the lower left, select the Play/pause button to review. 
  11. When finished, select Done
  12. In the Options menu, select Save As Video File to export the new file to your desktop.
TDX ID
5796