RTMPDumpHelper, how to change saved filename

RTMPDumpHelper, how to change saved filename

 

When I use RTMPDumpHelper it automatically creates a filename as its saves the file. Is there a way I can tell it what i want the filename to be before its starts?

I know I can change the filename after, but I am trying to write a script to automate a process, and I need the filename determined before it starts saving the file.

Thank you