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-rw-r--r--youtube_dl/postprocessor/ffmpeg.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index 30af6eb5a..1793a878c 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -175,6 +175,7 @@ class FFmpegPostProcessor(PostProcessor):
# Always use 'file:' because the filename may contain ':' (ffmpeg
# interprets that as a protocol) or can start with '-' (-- is broken in
# ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
+ # Also leave '-' intact in order not to break streaming to stdout.
return 'file:' + fn if fn != '-' else fn