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-rw-r--r--youtube_dl/extractor/streamcz.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/extractor/streamcz.py b/youtube_dl/extractor/streamcz.py
index 060ba32e0..97b2eb7f8 100644
--- a/youtube_dl/extractor/streamcz.py
+++ b/youtube_dl/extractor/streamcz.py
@@ -62,7 +62,7 @@ class StreamCZIE(InfoExtractor):
if not stream.get('url'):
continue
yield merge_dicts({
- 'format_id': '{}-{}'.format(format_id, ext),
+ 'format_id': '-'.join((format_id, ext)),
'ext': ext,
'source_preference': pref,
'url': urljoin(spl_url, stream['url']),