We've bought a few years ago a PWI Overlay Tools Addon. I’m using it on our server here, and we enjoy it
Jean-Noël Charollais, Mandarine Media, France
The module simplifies image and text overlay tasks as transcoder capabilities for Wowza Streaming Engine. The module will help whether you need server time or a news ticker to run over your live video stream. You can add broadcast graphical effects such as snipes, lower thirds or mortises. Text feed is sourced by RDD feed and the graphics are created as HTML pages. The module uses the specified URL to get the data to overlay the video stream.