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-rw-r--r--test/test_YoutubeDL.py1
-rwxr-xr-xyoutube_dl/YoutubeDL.py2
2 files changed, 3 insertions, 0 deletions
diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 62f916d11..4d62ba145 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -464,6 +464,7 @@ class TestFormatSelection(unittest.TestCase):
assert_syntax_error('+bestaudio')
assert_syntax_error('bestvideo+')
assert_syntax_error('/')
+ assert_syntax_error('bestvideo+bestvideo+bestaudio')
def test_format_filtering(self):
formats = [
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index aaac149e9..3f1f03379 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1226,6 +1226,8 @@ class YoutubeDL(object):
group = _parse_format_selection(tokens, inside_group=True)
current_selector = FormatSelector(GROUP, group, [])
elif string == '+':
+ if inside_merge:
+ raise syntax_error('Unexpected "+"', start)
video_selector = current_selector
audio_selector = _parse_format_selection(tokens, inside_merge=True)
if not video_selector or not audio_selector: