The pre-roll and post-roll features were designed to help ease the transition from offline to live. You may upload a video to run at the beginning (pre-roll) or end (post-roll) of your live stream.
How to upload a pre-roll or post-roll video?
Sign into your streaming account and navigate to "Settings/Features" . You will notice "Pre-Roll" and "Post-Roll" under the "Videos" section. From their respective pages, you will be presented with an "Upload" button.
When will the pre-roll or post-roll video show to my viewers?
The pre-roll video plays each and every time you start streaming live. The post-roll video plays each and every time your live stream stops.
This is independent of any event you have scheduled in your streaming account. The videos play based on when you start/stop streaming NOT when your event starts/stops
This is also independent of the viewer. These videos do not play for each viewer, rather only once when the live stream starts/stops.