Logging/verbose output?

Is there any option for logging and/or verbose output for this program? When I execute it with the decrypt option, it creates an empty .img file but doesn't fill the file with any data, and doesn't display any errors. It would be nice to have a flag for verbose output that gives an idea of what the program is working on, or what it's stuck on.

Or maybe there's something in the documentation and I'm just missing it? I'm using the precompiled version for Linux.