X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=youtube_dl%2Futils.py;h=a2c6780ca354f98514910752cec596a4eee172e5;hb=765ac263dbf17442f41715a1cfce13fc61a4b315;hp=7ce661b09ea428ea05954b355e09ea298e04fb73;hpb=5bc880b9887c9689fef171683eae279adbbfc186;p=youtube-dl

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 7ce661b09..a2c6780ca 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1836,6 +1836,12 @@ def error_to_compat_str(err):
 
 
 def mimetype2ext(mt):
+    ext = {
+        'audio/mp4': 'm4a',
+    }.get(mt)
+    if ext is not None:
+        return ext
+
     _, _, res = mt.rpartition('/')
 
     return {