How do I use -diff from command line with SVN

Development Programming & Scripting
1

I am trying to launch diff tool from command line with -diff parameter between two SVN revisions with following arguments:
UE4Editor.exe path_to_project -diff file_local_path#revision file_local_path#revision

And it fails with “such file not found” error.

The help of the -diff command:

Usage: 
    -diff [options] left right                                                 
    -diff [options] remote local base result                                   

Options: 
    -echo               Prints back the command arguments and then exits.      
    -help, -h, -?       Display this message and then exits.

Does not help a lot. What exactly is “left” or “right”? Is this a path to local file or url of repo? How do I specify revision?