If you are using a video URL as the video source for your various pages, please ensure that you are linking directly to the actual video file. For example, https://mywebsite.com/myvideo.mp4. Also, please ensure that your video URLs start with https:// instead of http:// as this will ensure a smoother video playback experience in all browsers.
If you are using Vimeo.com as the host for your videos, please make sure you're linking to the direct video file and not the regular Vimeo link. Click here for more information on using direct links to Vimeo video files.
Regular YouTube links can be used as your webinar video source directly without issue.