Programs enabling conversion of the file:
If your objective is to convert the file from 264 to the file FLV, you can use any of the applications listed. 264 to FLV conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions 264 and FLV - and not only converters. In such a case, you need to open the source file 264 and from the options available in the program, choose ”Save as... FLV" or "Export to FLV".