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Kaltura Capture - Troubleshooting

This document provides some basic information on troubleshooting Kaltura Capture issues.

    Kaltura Capture is a relatively new tool - we want to remind users to keep recordings short: 4-6 minutes max. This way if there are issues it isn't as burdensome to recreate with Capture or another tool if need be.

    Minimum specifications

    First - make sure your machine meets the minimum requirements to run Kaltura Capture. The minimum requirements are listed in Kaltura Capture - Installation and Kaltura Capture - Prerequisites and System Requirements.

    System updates

    Check to see if your operating system is up to date - generally it's a good idea to keep your operating system up-to-date.

    Kaltura Capture updates

    Once installed by an end-user as described in  Kaltura Capture will attempt to auto-update itself if the application is left idle for approximately five minutes. A message will display informing the user the update is taking place, to not start a new capture until the update is complete, and a final notification letting the user know the update is finished. Kaltura Capture installations installed to lab deployments do not auto-update.

    Free hard drive space

    The amount of free space you need on your hard drive depends on a lot of factors: if you're only capturing your webcam, your screen, or both, the resolution you're capturing, the amount of motion/change, and the duration of your capture. Generally we recommend that you should have at least 1 GB of free space available. A 1080p webcam recording records approximately 10 MB/min, and a 1080p screen recording records approximately 10 MB/min.

    Testing your home internet connection

    While you don't need a fast internet connection to download Kaltura Capture or create screen recordings, having a good internet connection is important when you're ready to upload them to Kaltura MediaSpace. Captures that include both the screen and webcam are twice as large and will take twice as long to upload and process. Test your speed by going to The test will initially run and show you your downloads speed. Click the "Show more info" button to see your upload speed.

    1 Mbps upload speed should be able to upload a 250 MB file in about 33 minutes. File size depends on whether you capture both the screen and webcam, and what quality you are capturing at. A test 5 minute capture which included both the camera and screen set to 1080p quality was 233 MB.

    Locating your local Kaltura Capture file recordings

    See Kaltura Capture - Locating the local recording files on your computer. Generally you don't want to rename or move these files (it will break Kaltura Capture's connection to them and you won't be able to upload or play them back in Kaltura Capture), but you can create a copy of them to put in another folder to rename or use with other applications, manually upload to Kaltura MediaSpace or other video streaming services.

    Memory under 1 GB error message

    Generally the warning message will appear if you are running too many applications. Try to close any unneeded applications before trying to create a screencast with Kaltura Capture. We have had reports of the error message when users have more than 1 GB of memory free.

    macOS Kaltura Capture doesn't capture system audio

    This is mentioned in Kaltura Capture - Installation , but Kaltura Capture on macOS is not able to capture system audio. For example - it cannot capture the audio from a video you play back while you are capturing. If you need to capture system audio we recommend purchasing a tool like TechSmith Camtasia.

    Keywords:kaltura, mediaspace, troubleshooting, error, bug, issue, update, speed, connection, internet, file, location,system, audio   Doc ID:99823
    Owner:Learn@UW Madison .Group:Learn@UW-Madison
    Created:2020-03-31 15:49 CDTUpdated:2020-07-07 12:45 CDT
    Sites:DoIT Help Desk, Learn@UW-Madison
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