video quality active speaker cloud recording

I am having the same issue, have you found a solution to it yet?

You will need to do a few things in order to get consistent quality on your active speaker views.

1.) Request that the Group HD feature be enabled on your account - this may be standard in the future, but currently, this requires a request to Zoom Support. Once this is done, be sure to enable Group HD 1080 on the account that will host these meetings that are recorded.

2.) Ensure that the active speaker is using a high-resolution webcam, a capable computer, and a strong internet connection. Most integrated webcams are still 1280x720, so aim for one with a 1920x1080 resolution (or use an external FHD webcam for better results).

3.) Here's the kicker. Zoom will attempt to conserve bandwidth wherever possible, so if none of the far-end participants require a full-res view, Zoom won't send it. Ensure that at least one endpoint/participant is viewing active speaker in full-screen at all times during the meeting. You'll be able to confirm what resolution is being received in Settings->Statistics. 

4.) Encourage all speakers to use a wired ethernet connection wherever possible. Even if you're getting great speeds on a speed test with wi-fi, a short-burst wi-fi speed test doesn't account for stability - only up/down speeds at a point in time. Friends don't let friends take Zoom calls on Wi-Fi!

More on Group HD here: https://support.zoom.us/hc/en-us/articles/207347086-Using-Group-HD-video