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Vmix 4k with Desktop Capture over Zoom
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Joined: 10/8/2025(UTC) Posts: 2  Thanks: 1 times
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Hi All,
Just looking for some thoughts please. We are running Vmix 4K on powerful media server (16 core / 32 threads and 96GB DDR5 Ram). We are hosting a Zoom call through vmix and all the audio and video routing seems to be working great however, when we put a powerpoint presentation on the main output (which looks great) that same screen is also sent to zoom and is very, very pixalated to a point where you can't really read it. Our Zoom account is paid so we have enabled the HD setting - all other content sent over zoom looks fine but the powerpoint feed which is coming over vmix desktop capture is unreadable. I have also exported the presentation and have imported it directly to the vmix server and then just added it as as input (so no NDI) and then sent to zoom but again very pixalated.
Can anyone shed any light on this please who may have come accross it.
Note: We have a quick enough internet connection, 300mbps download and 70mbps upload. I seem to just have run out of options now...
Thanks in advance
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Rank: Advanced Member
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Joined: 4/23/2017(UTC) Posts: 1,371  Location: Germany Thanks: 3 times
Was thanked: 184 time(s) in 165 post(s)
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The PPT is send as a video and shows no change in content, so basically a still. The codec will reduce the bandwidth drastically from 2-4 mbps to a few 100 kbps. This is the nature of the codec how the codec works. You can't change it. The way to go is to share the PPT within the Zoom call. You can setup a second computer connected to the zoom as a presenter and share the screen from there. With a remote clicker like octocue or internetclicker you can even controll the presentation from every other device.
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 1 user thanked mavik for this useful post.
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Rank: Newbie
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Joined: 10/8/2025(UTC) Posts: 2 Thanks: 1 times
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Originally Posted by: mavik  The PPT is send as a video and shows no change in content, so basically a still. The codec will reduce the bandwidth drastically from 2-4 mbps to a few 100 kbps. This is the nature of the codec how the codec works. You can't change it. The way to go is to share the PPT within the Zoom call. You can setup a second computer connected to the zoom as a presenter and share the screen from there. With a remote clicker like octocue or internetclicker you can even controll the presentation from every other device. I fully understand that - it is slightly annoying as vmix is perfect for getting rid of the old way with 7 laptops in an av booth :) - I will do this as a screen share from a seperate laptop to keep the clarity. Thank you for your reply.
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Rank: Advanced Member
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Joined: 4/23/2017(UTC) Posts: 1,371 Location: Germany Thanks: 3 times
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I agree. But even vMix can't defy the physics/logic. Sometimes it's better one or the other way. I would say there is also another problem. The presentation itself. Most people use PPT as a replacement for Word and put too much and too small information into a slide. So if the PPT was created with the video context in mind it will help to avoid issues. But I know that the people who create the slides have no idea of how they misuse PPT. I would say 90% of all PPTs worldwide are not the way how PPT was intended.
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Rank: Advanced Member
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Joined: 7/4/2021(UTC) Posts: 409  Thanks: 9 times
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Originally Posted by: mavik I agree. But even vMix can't defy the physics/logic. Sometimes it's better one or the other way. There are elements of the Zoom Meeting SDK that they didn't implement. Screen sharing is one of those elements. Their focus was on what their focus has always been on--virtual interviews and the like. But, in theory, it probably could've been designed to start a screen share, with 1 vMix Output designated as the camera source and another designated as the screen share source.
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