We are aware that Zoom videos are not compressing properly and the output video is larger than the input video. We are currently investigating the issue and will have a proper solution to address this issue.

The challenge is that Zoom does a great job with their video compression, and compressing on top of their videos causes the output file to increase. The paragraph below was taken from their website.

Video is really, really important at Zoom. Let us put it this way: The engineer ultimately responsible for our video quality and reliability sits right next to our CEO. The two of them literally share an office. It’s no wonder this PhD engineer and his team obsess over the visual experience of Zoom, spending day in and day out making sure your video is truly awesome. Here’s how they get it done:

We are going to have a solution to this problem soon.