diff --git a/meshroom/ui/app.py b/meshroom/ui/app.py
index 817375ea..e8e22fc9 100644
--- a/meshroom/ui/app.py
+++ b/meshroom/ui/app.py
@@ -59,15 +59,13 @@ class MeshroomApp(QApplication):
 
         parser = argparse.ArgumentParser(prog=args[0], description='Launch Meshroom UI.', add_help=True)
 
-        parser.add_argument('input', metavar='INPUT', type=str, nargs='?',
+        parser.add_argument('project', metavar='PROJECT', type=str, nargs='?',
                             help='Meshroom project file (e.g. myProject.mg) or folder with images to reconstruct.')
         parser.add_argument('-i', '--import', metavar='IMAGES/FOLDERS', type=str, nargs='*',
                             help='Import images or folder with images to reconstruct.')
         parser.add_argument('-I', '--importRecursive', metavar='FOLDERS', type=str, nargs='*',
                             help='Import images to reconstruct from specified folder and sub-folders.')
-        parser.add_argument('-p', '--project', metavar='MESHROOM_FILE', type=str, required=False,
-                            help='Meshroom project file (e.g. myProject.mg).')
-        parser.add_argument('-P', '--pipeline', metavar='MESHROOM_FILE', type=str, required=False,
+        parser.add_argument('-p', '--pipeline', metavar='MESHROOM_FILE', type=str, required=False,
                             help='Override the default Meshroom pipeline with this external graph.')
 
         args = parser.parse_args(args[1:])
@@ -130,29 +128,14 @@ class MeshroomApp(QApplication):
             if defaultPipeline:
                 r.setDefaultPipeline(args.pipeline)
 
-        if args.input:
-            if not os.path.isfile(args.input) and not os.path.isdir(args.input):
-                raise RuntimeError(
-                    "Meshroom Command Line Error: 'INPUT' argument should be a Meshroom project file (.mg) or a folder with input images.\n"
-                    "Invalid value: '{}'".format(args.input))
         if args.project and not os.path.isfile(args.project):
             raise RuntimeError(
-                "Meshroom Command Line Error: '--project' argument should be a Meshroom project file (.mg).\n"
+                "Meshroom Command Line Error: 'PROJECT' argument should be a Meshroom project file (.mg).\n"
                 "Invalid value: '{}'".format(args.project))
 
-        if args.project and args.input and not os.path.isdir(args.input):
-            raise RuntimeError("Meshroom Command Line Error: 'INPUT' and '--project' arguments cannot both load a Meshroom project file (.mg).")
-
         if args.project:
             r.load(args.project)
 
-        if args.input:
-            if os.path.isfile(args.input):
-                # we assume that it is an ".mg" file.
-                r.load(args.input)
-            elif os.path.isdir(args.input):
-                r.importImagesFromFolder(args.input, recursive=False)
-
         # import is a python keyword, so we have to access the attribute by a string
         if getattr(args, "import", None):
             r.importImagesFromFolder(getattr(args, "import"), recursive=False)