[__init__] Provide a better error messages if URLs are missing (Closes #4813)

diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 71d2c6f350beacecda8f844c2bd337c95732c61a..e90679ff974e6464885284733edf96ab4aca09b9 100644 (file)
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -361,7 +361,9 @@ def _real_main(argv=None):
                 sys.exit()
 
             ydl.warn_if_short_id(sys.argv[1:] if argv is None else argv)
-            parser.error('you must provide at least one URL')
+            parser.error(
+                'You must provide at least one URL.\n'
+                'Type youtube-dl --help to see a list of all options.')
 
         try:
             if opts.load_info_filename is not None: