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-rw-r--r--youtube_dl/__init__.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index df4feefe7..1ed30aae3 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -551,6 +551,10 @@ def _real_main(argv=None):
or (opts.useid and u'%(id)s.%(ext)s')
or (opts.autonumber and u'%(autonumber)s-%(id)s.%(ext)s')
or u'%(title)s-%(id)s.%(ext)s')
+ if '%(ext)s' not in outtmpl and opts.extractaudio:
+ parser.error(u'Cannot download a video and extract audio into the same'
+ u' file! Use "%%(ext)s" instead of %r' %
+ determine_ext(outtmpl, u''))
# YoutubeDL
ydl = YoutubeDL({