[utils] Clarify for redirecting STDIN in get_exe_version()
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@ -1818,6 +1818,9 @@ def get_exe_version(exe, args=['--version'],
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""" Returns the version of the specified executable,
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or False if the executable is not present """
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try:
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# STDIN should be redirected too. On UNIX-like systems, ffmpeg triggers
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# SIGTTOU if youtube-dl is run in the background.
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# See https://github.com/rg3/youtube-dl/issues/955#issuecomment-209789656
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out, _ = subprocess.Popen(
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[encodeArgument(exe)] + args,
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stdin=subprocess.PIPE,
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