To change the size of the video users can upload, you need to follow these steps.
Login to admincp -> System settings -> General Configuration

You can configure the size of the video that user can upload based on the user role by go to admincp -> System settings -> manage user roles

Select a role that you want to setup and click on “Permissions”
Find “Post” and “Vibb” to change the “Max video size (duration – seconds) can upload” to your desired number

