diff -r 7afa994c98f0 -r 1b17b8cdbfc3 src/CLIParser.h
--- a/src/CLIParser.h	Fri Apr 02 17:44:01 2021 +0200
+++ b/src/CLIParser.h	Wed Apr 07 22:55:00 2021 +0200
@@ -54,6 +54,8 @@
 	Configuration parse(const std::vector<relpipe::common::type::StringX>& arguments) {
 		Configuration c;
 
+		if (arguments.size() == 0) c.listInputDevices = true;
+
 		for (int i = 0; i < arguments.size();) {
 			relpipe::common::type::StringX option = readNext(arguments, i);