[youtube] Handle cases where format comes without a preference (Fixes #4648)

9 years ago · ee61f6f3e2
parent 8f9529cd05
commit ee61f6f3e2
1 changed files with 1 additions and 1 deletions
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@ -1046,7 +1046,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                    for f in formats:
                        if f['format_id'] in dash_keys:
                            f['format_id'] = 'nondash-%s' % f['format_id']
-                            f['preference'] -= 10000
+                            f['preference'] = f.get('preference', 0) - 10000
                    formats.extend(dash_formats)

        self._sort_formats(formats)