It appears to be a bug with xdg-utils, or at least triggered from there:
Looking at the strace output, there's a sleep process being invoked,
which "hangs"/waits in the end:
15202 0.000070 execve("/bin/sleep", ["sleep", "50"], [/* 71
vars */] <unfinished ...>
This originates from
/usr/lib/vlc/plugins/misc/libxdg_screensaver_plugin.so (where it gets
cloned/created from).
Use of this plugin/feature can be toggled in VLC using the "disable-
screensaver" setting, which I have enabled (appears to be the default).
This comes from screensaver_suspend_loop out of xdg-screensaver from
xdg-utils:
(while [ -f "$screensaver_file" ]; do $*; sleep 50; done) >
/dev/null 2> /dev/null &
This background process seems to be blocking, if stderr is being
redirected from vlc, and stdout being read by e.g. grep.
I have not investigated how this worked previously, but it must have
changed somehow.
Is there a way to make the "vlc pipeline" end before the subprocess ends
itself?
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https://bugs.launchpad.net/bugs/897341
Title:
vlc hangs after exiting when its stderr is redirected to stdout
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