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-rw-r--r--youtube_dl/downloader/external.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/downloader/external.py b/youtube_dl/downloader/external.py
index 30277dc20..8d642fc3e 100644
--- a/youtube_dl/downloader/external.py
+++ b/youtube_dl/downloader/external.py
@@ -225,7 +225,7 @@ class FFmpegFD(ExternalFD):
args += ['-i', url, '-c', 'copy']
if protocol == 'm3u8':
- if self.params.get('hls_use_mpegts', False):
+ if self.params.get('hls_use_mpegts', False) or tmpfilename == '-':
args += ['-f', 'mpegts']
else:
args += ['-f', 'mp4', '-bsf:a', 'aac_adtstoasc']