Difficulty showing MP4 short videos - screen sharing

Hello @paulf101 
There could be many things from Internet Performance, Computer resources, or maybe you have a settings in your Zoom App limiting the Frame-Rate; I would recommend try something, and check a few things.

1. Download the Video locally to your computer, and play it from there to verify if it makes any difference.
2. Check in your  "Zoom App > Settings > Share Screen > Advanced > Limit your Screen shared to 'x' frames-per-second" is disabled.
3. While in a Zoom Meeting, and before sharing anything, check in your "Zoom App > Settings > Statistics" to verify how it your Overall CPU and Memory utilization:
   • if it shows a warning (Yellow, Orange or Red), computer resources could be the culprit of your issue.
   • Check also the other tabs (Audio, Video, Screen Sharing, and make sure you have barely any packet loss (if anything);  also any  value of Jitter over  40-50ms is problematic and also most likely the cause.
4. Now, Start Sharing and Play the Video, and to the same checking done on the previous Step 3 and verify the values, including 
   • Results values shouldn't be too apart from the previous test.

Let us know how it goes.

Vinnie