From: Sergey M․ <dstftw@gmail.com>
Date: Sun, 26 Jun 2016 14:09:07 +0000 (+0700)
Subject: [extractor/common] Fix sorting with custom field preference
X-Git-Url: http://git.oshgnacknak.de/?a=commitdiff_plain;h=bf8dd790456acc4a96d2961e61e96c4771e4d787;p=youtube-dl

[extractor/common] Fix sorting with custom field preference
---

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 4eda4e2ea..e6c15de42 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -878,7 +878,11 @@ class InfoExtractor(object):
                 f['ext'] = determine_ext(f['url'])
 
             if isinstance(field_preference, (list, tuple)):
-                return tuple(f.get(field) if f.get(field) is not None else -1 for field in field_preference)
+                return tuple(
+                    f.get(field)
+                    if f.get(field) is not None
+                    else ('' if field == 'format_id' else -1)
+                    for field in field_preference)
 
             preference = f.get('preference')
             if preference is None: