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-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,