From ce031e9d18cd8ec154a749ba5c066c8c0f7eec6b Mon Sep 17 00:00:00 2001
From: mk-pmb <mk-pmb@users.noreply.github.com>
Date: Thu, 16 May 2024 02:26:47 +0200
Subject: [PATCH] [core] Empty format selection string means anything goes.

---
 test/test_YoutubeDL.py  | 5 +++++
 youtube_dl/YoutubeDL.py | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index d994682b2..7040cd93a 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -136,6 +136,11 @@ class TestFormatSelection(unittest.TestCase):
         ]
         info_dict = _make_result(formats)
 
+        ydl = YDL({'format': ''}) # no criteria => anything goes
+        ydl.process_ie_result(info_dict.copy())
+        downloaded = ydl.downloaded_info_dicts[0]
+        self.assertEqual(downloaded['format_id'], '35')
+
         ydl = YDL({'format': '20/47'})
         ydl.process_ie_result(info_dict.copy())
         downloaded = ydl.downloaded_info_dicts[0]
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 6f2aba5ac..062e1fe37 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1289,6 +1289,9 @@ class YoutubeDL(object):
                 '{0}\n\t{1}\n\t{2}^'.format(note, format_spec, ' ' * start[1]))
             return SyntaxError(message)
 
+        if not format_spec:
+            format_spec = 'worst'
+
         PICKFIRST = 'PICKFIRST'
         MERGE = 'MERGE'
         SINGLE = 'SINGLE'