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Kaltura - Known Issue - Kaltura Capture and OSX resolution and quality issues

This document describes issues around using Kaltura Capture on OSX, capture quality and display resolution.

    Learn@UW-Madison has received reports of lower quality captures on Mac OSX with Kaltura Capture. After some investigation we believe it is because newer OSX systems use pixel doubling on Retina capable monitors. Even though your Displays system preference may indicate you are at a high resolution, Kaltura Capture will only capture half to a quarter that resolution. This will lower the resolution and quality of the capture and make small text difficult or impossible to read.

    Affects

    This issue affects any user using Kaltura Capture in OSX who wants to capture the maximum resolution (1920 x 1080) that Kaltura Capture is capable of capturing.

    Status

    As of 10/16/19 this issue is still present. Learn@UW-Madison is connecting with Kaltura for more information.

    Workarounds / options

    There are several potential workarounds:

    Double check your Kaltura Capture "Screen recording quality" setting, check your display resolution, and do a test recording

    This isn't a workaround so much as a workflow to help mitigate the quality issues if you are using Kaltura Capture on OSX. First - check your Kaltura Capture preferences by clicking Manage in the control panel, and then the gear button in your Kaltura Capture library. Your Screen recording quality should be set to 1080p:
    A screenshot showing the Kaltura Capture "Settings" screen. The "Screen recording quality" preference has been outlined in red to help point it out. The radio button for 1080p has been selected for greatest quality.

    Second - check your Mac's Displays setting. Generally it is best to set it at Default for Display but you can also try Scaled and select the option furthest to the right which should say something like "More Space". The Displays system preference will also indicate to the left when you mouse over the option the approximate resolution. The problem is this is just an approximation and not the actual resolution the display is using. In this example I have set a MacBook Pro to use "Scaled" to approximate 1920 x 1200:
    A screenshot showing an OSX "Displays" system preference where a Retina display is set to "Scaled" and "More Space" where the approximate resolution is 1920 x 1200.

    However when captured by Kaltura Capture the actual capture is 1728 x 1080 and has some loss in quality.

    Third - do a short test capture of any graphics with small detail or text to see what the quality will look like in Kaltura MediaSpace before doing your full capture. If there is any text that is difficult to read consider whether you can increase the size of the text or reduce the amount of text on the slide to make it more readable. If you can't, proceed to one of the workarounds below.

    Use an external non-Apple monitor with your Mac

    Using a non-Apple monitor externally to your Mac will allow you to manually set the resolution in your Displays System Preference. Make sure you set the resolution to as close to 1920 x 1080 as you can, and do a test capture before doing your full capture:
    A screenshot showing the OSX "Displays" system preference for a non-Apple external monitor connected to a Mac. The user has selected "1080p" as the screen's resolution for recording with Kaltura Capture." alt="A screenshot showing the OSX "Displays" system preference for a non-Apple external monitor connected to a Mac. The user has selected "1080p" as the screen's resolution for recording with Kaltura Capture.

    This will both give you an accurate representation on your monitor of what you are capturing and make sure you capture 1080p quality (1920 x 1080). Be sure to double check your Kaltura Capture Screen recording quality preference as described above.

    Use another screen capture tool

    Microsoft Powerpoint for Office 365 is capable of recording Powerpoint slideshows and exporting them as MP4 files which can be uploaded to Kaltura. For more information please see Microsoft's documentation Record a slide show with narration and slide timings. You'll need to check with your your local departmental IT staff to see if they can install it for you. Alternately screen capture tools like TechSmith Camtasia are capable of capturing higher resolution and quality but cost money.





    Keywords:Kaltura, Capture, display, resolution, video, quality, bug,   Doc ID:90697
    Owner:Learn@UW Madison .Group:Learn@UW-Madison
    Created:2019-03-28 07:59 CSTUpdated:2019-11-05 09:19 CST
    Sites:DoIT Help Desk, Learn@UW-Madison
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