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-rw-r--r--youtube_dl/extractor/youtube.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index ff32758df..72d9fbbc6 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1603,6 +1603,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                     # Youtube throttles chunks >~10M
                     'http_chunk_size': 10485760,
                 }
+                if dct.get('ext'):
+                    dct['container'] = dct['ext'] + '_dash'
             formats.append(dct)
 
         hls_manifest_url = streaming_data.get('hlsManifestUrl')