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authorJohn Hawkinson <jhawk@mit.edu>2016-10-21 20:44:49 -0400
committerJohn Hawkinson <jhawk@mit.edu>2016-10-22 00:34:08 -0400
commit00ca7552317bb69ce8eb84582d658d5e52997394 (patch)
tree1548f4a94f9c3dda958efd673829c6666e662b73 /youtube_dl/update.py
parent69c2d42bd730b4ea07fe5ba9015049423b71c8a9 (diff)
[get_exe_version] Do version probes with <&-
When doing version probes for ffmpeg, do the equivalent of calling it as: ffmpeg -version <&- Where <&- is shell syntax for closing stdin before calling the program. This is roughly equivalent to </dev/null without actually opening /dev/null. This prevents ffmpeg -version from hanging when run in the background. Fixes #955. The reason is that ffmpeg tries to manipulate stdin to set up terminal characteristic, and that causes the kernel to suspend the parent process (youtube-dl). Note that closing stdin is achieved by calling subprocess.Popen() with stdin set to subprocess.PIPE and without passing any input to Popen.communicate(). This is somewhat subtle.
Diffstat (limited to 'youtube_dl/update.py')
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