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authorYen Chi Hsuan <yan12125@gmail.com>2016-10-22 13:04:05 +0800
committerYen Chi Hsuan <yan12125@gmail.com>2016-10-22 13:04:05 +0800
commitb64d04c119cd835683b95c13667dbae5db8b939f (patch)
treefaa3980e92f9726434af0873fab5ff076d3b33e5
parent00ca7552317bb69ce8eb84582d658d5e52997394 (diff)
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[utils] Clarify for redirecting STDIN in get_exe_version()
-rw-r--r--youtube_dl/utils.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index a89ff6908..2770c5f1c 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1818,6 +1818,9 @@ def get_exe_version(exe, args=['--version'],
     """ Returns the version of the specified executable,
     or False if the executable is not present """
     try:
+        # STDIN should be redirected too. On UNIX-like systems, ffmpeg triggers
+        # SIGTTOU if youtube-dl is run in the background.
+        # See https://github.com/rg3/youtube-dl/issues/955#issuecomment-209789656
         out, _ = subprocess.Popen(
             [encodeArgument(exe)] + args,
             stdin=subprocess.PIPE,