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[ffmpeg] Clarify rationale for pipe(-) exclusion in _ffmpeg_filename_argument
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@ -175,6 +175,7 @@ class FFmpegPostProcessor(PostProcessor):
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# Always use 'file:' because the filename may contain ':' (ffmpeg
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# interprets that as a protocol) or can start with '-' (-- is broken in
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# ffmpeg, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details)
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# Also leave '-' intact in order not to break streaming to stdout.
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return 'file:' + fn if fn != '-' else fn
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