[options] Refactor autonumber options and add validation (closes #727, closes #2702, closes #9362)

1 files changed, 6 insertions, 0 deletions

diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 577bc880f..2b156342a 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -133,6 +133,12 @@ def _real_main(argv=None):
         parser.error('TV Provider account username missing\n')
     if opts.outtmpl is not None and (opts.usetitle or opts.autonumber or opts.useid):
         parser.error('using output template conflicts with using title, video ID or auto number')
+    if opts.autonumber_size is not None:
+        if opts.autonumber_size <= 0:
+            parser.error('auto number size must be positive')
+    if opts.autonumber_start is not None:
+        if opts.autonumber_start < 0:
+            parser.error('auto number start must be positive or 0')
     if opts.usetitle and opts.useid:
         parser.error('using title conflicts with using video ID')
     if opts.username is not None and opts.password is None: