Video Lag, audio stutter/slur when presenting by sharing a screen
I’m a member of a photography club that has a Zoom license for meetings. We typically have between 15 and 30 participants at the meetings. In a Zoom meeting that’s limited to conversation, we infrequently encounter any problems with video lag or audio stuttering/slurring/dragging. But in presentation meetings where the presenter is sharing a screen or even just a window, we frequently get very bad multi-second video lag. It happened most recently last evening when I was presenting some editing techniques in Lightroom. I shared a window in 16:9 aspect ratio, and used a connection of around 18-20Mbps. My system is an i9-12900, AMD 5700 XT GPU, and 64GB of memory running Windows 11 Pro, but the same thing happened with Windows 10 Pro prior to the upgrade. I never saw system usage exceed 15%, and whenever I checked the bandwidth I always had at least 18 Mbps available. I don’t THINK there’s a problem on my end, but I'm not sure I'd have any way of knowing. Participants who were watching the presentation reported significant video lag throughout the presentation, to the point where many viewers were unable to follow what I was doing. A short time ago, another member presented some images – no editing, just a display of images sized to fit on a monitor – these were not large images. His audio described the images, and we experienced the same kind of significant video lag. I don’t know the specifics of the system or connection he was using, but I believe it’s a current system with more than adequate resources. Neither of the above are unique. This happens frequently when we do any kind of screen sharing or presentation. In my search, I found a number of other entries talking about similar issues, but didn’t find any pointer to a defined procedure for determining the origin of the problem and correcting it. Audio problems occur randomly even when engaged in simple conversations with a couple dozen participants. It’s not constant, but it is periodically audio will slur and drag out words. This occurs at times when no one is sharing a screen or doing anything unusual. Does the presenter’s screen resolution impact the video lag, or only the people watching the presentation? I’m using a 4K screen, but sharing a 16:9, 2800x1600px window. Do I need to create and share a SMALLER window that’s 1920x1080 for sharing? Do people receiving the presentation need to reduce THEIR screen resolution below 1920x1080? Does the number of people watching the presentation impact the occurrence of video and/or audio problems? Does having participants turn off their video and mute their microphone reduce the likelihood of encountering video and audio problems? Is there something that can be done in settings or configuration that will correct this video lag problem? Do “beauty mode” and/or video filters affect the screen share and increase the likelihood of having problems?
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