Step 1: Free download best FLV to DVD Converter and install it.
The interface is like the following:

Step 2: Launch free FLV to DVD Converter, and add flv file by click "Add Files", batch conversion is supported.

Step 3: Edit the input FLV file by click 
Step 4: Output settings- under Profile selection: click download arrow, Choose: FLV video format (*.flv)
under output Folder , Click "Brower" button to select the folder you want the converted DVD Files to store. (the default folder is stored under file: c:\outputFolder\)

Step 5: Click "Start" button to begin the FLV to DVD Conversion.
Note 1: if you want to Rip DVD to FLV in order to share it with your net friends: please reffer to : Guide: how to Rip DVD to FLV
Note 2: Converting FLV to DVD is just part function of Emicsoft FLV Converter which is distributed by Emicsoft Studio.