From 350cf045d8f86497e8d79ae193b40cc44c8e670c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Sat, 30 Jan 2016 01:47:46 +0600
Subject: [PATCH] [extractor/common] Restrict checks when auto calculating tbr

---
 youtube_dl/extractor/common.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 33290fd74..b3d57dfce 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -828,7 +828,7 @@ class InfoExtractor(object):
         for f in formats:
             # Automatically determine tbr when missing based on abr and vbr (improves
             # formats sorting in some cases)
-            if 'tbr' not in f and 'abr' in f and 'vbr' in f:
+            if 'tbr' not in f and f.get('abr') is not None and f.get('vbr') is not None:
                 f['tbr'] = f['abr'] + f['vbr']
 
         def _formats_key(f):