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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 fbdc44505..d1736c023 100644
--- a/youtube_dl/extractor/streamcz.py
+++ b/youtube_dl/extractor/streamcz.py
@@ -43,7 +43,7 @@ class StreamCZIE(InfoExtractor):
if not stream.get('url'):
continue
yield {
- 'format_id': f'{format_id}-{ext}',
+ 'format_id': '{}-{}'.format(format_id, ext),
'ext': ext,
'source_preference': pref,
'url': urljoin(spl_url, stream['url']),