Updated recommendations for those using Kaltura Capture to create dual-stream videos

August 14, 2020

Syncing issues with video and audio have occurred with longer dual-stream videos (i.e. those in which you capture both Camera and Screen). To avoid these issues we recommend that you:

  1. Make short videos. For the best results when recording dual-stream videos, keep recording time short, 6 to 10 minutes. Additionally, when it comes to playing back dual-stream videos, giving the video time to load on the bCourses page and/or refreshing the page can reduce sync issues with longer videos; you may want to alert your students to this, but a student announcement in bCourses will also be made. Kaltura is most likely addressing the syncing issue in a new version of their player, due early next year.

There are pedagogical reasons to record shorter videos, as well. Breaking lectures into smaller, sequenced sections can help students stay engaged and comprehend the material better. It also gives you the opportunity to add activities for application and integration in between segments such as discussions or check for understanding quizzes. Read more about pedagogical best practices for video in our Remote Instruction Guide

  1. Set Kaltura Capture to record Screen at 1080p and Camera at 720p. Unless you have a good reason to capture the video from your camera at the highest quality, setting it to 720p (rather than 1080) can improve streaming performance. To set Kaltura Capture this way, click the Manage link in the Kaltura Capture Toolbar, and then click the gear icon.

In addition, we recommend that you: 

  1. Routinely back up then delete Kaltura Capture files from your computer. All video files, but especially dual-stream video files, take up large amounts of hard disk space, which may eventually cause problems. Once you’ve uploaded the videos to your “My Media”, there’s no reason to keep them on your computer; however, saving to bDrive or an external drive can be a good practice. To delete videos from your computer, open Kaltura Capture, click Manage, click the folder icon to view your Library, and then either use the Delete buttons to delete selected videos, or delete them all by clicking “Delete all uploaded files”. 

  2. Ensure that all critical information is in the recording of your screen, if you will be enabling downloads for students. If you set your media to be downloadable by students, only the stream with the screen recording gets downloaded. As such, you may want to ensure that no critical info is in the camera stream if students will be downloading your videos. 

Send email to kalturahelp@berkeley.edu if you have questions about the above.