How can I use text chat in video chat?
We have a text information overlay that is just a C# .NET Windows service that creates a PNG file with mainly transparency plus some text. This service consumes minimal CPU and gets its data from a SQL database.
You could do something similar - Wowza will update the PNG graphics ever 750ms which, whilst on the longer side of text chat latency consideration, will still provide good effect for minimal cost.
The C# stuff is less than 1000 lines of code, most of which is scheduling and control. Only about 150 lines of it is actual image manipulation.
Advantage of this is that it keeps it simple and doesn’t interfere with the internal workings of Wowza. Plus I’m a C# guy, not a Java guy 
@Stuart Gunn
Thank you, I will try.