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-rwxr-xr-xyoutube_dl/YoutubeDL.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index c18ce9660..1730df4cd 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -964,9 +964,11 @@ class YoutubeDL(object):
thumbnails.sort(key=lambda t: (
t.get('preference'), t.get('width'), t.get('height'),
t.get('id'), t.get('url')))
- for t in thumbnails:
+ for i, t in enumerate(thumbnails):
if 'width' in t and 'height' in t:
t['resolution'] = '%dx%d' % (t['width'], t['height'])
+ if t.get('id') is None:
+ t['id'] = '%d' % i
if thumbnails and 'thumbnail' not in info_dict:
info_dict['thumbnail'] = thumbnails[-1]['url']