Hi everyone,
I want to run FFmpeg as a background process. But if you run something
like the following command line, the process will bu suspended as long
as FFmpeg is in the background:
$ ffmpeg -y -f lavfi -i testsrc=r=1 -t 300 out.mp4&
ffmpeg version 3.1.7 Copyright (c) 2000-2017 the FFmpeg developers
...
[1]+ Stopped ffmpeg -y -f lavfi -i testsrc=r=1 -t 300 out.mp4
$ ls -l out.mp4
ls: cannot access 'out.mp4': No such file or directory
Only after using `fg` to get the process to the foreground, FFmpeg will
actually start the encoding.
I have tried using the `-nostdin` option to fix that as the
documentation states:
-stdin
Enable interaction on standard input. On by default unless standard
input is used as an input. To explicitly disable interaction you
need to specify "-nostdin".
Disabling interaction on standard input is useful, for example, if
ffmpeg is in the background process group. Roughly the same result
can be achieved with "ffmpeg ... < /dev/null" but it requires a
shell.
But the option seems to have no effect, except for disabling the
keyboard controls:
$ ffmpeg -nostdin -y -f lavfi -i testsrc=r=1 -t 300 out.mp4&
ffmpeg version 3.1.7 Copyright (c) 2000-2017 the FFmpeg developers
...
[1]+ Stopped ffmpeg -nostdin -y -f lavfi -i ... out.mp4
$ ls -l out.mp4
ls: cannot access 'out.mp4': No such file or directory
What works id to pipe /dev/null into ffmpeg like this:
$ ffmpeg -f lavfi -i testsrc=r=1 -t 300 out.mp4 < /dev/null &
The problem is that a shell is required for this and I do not want to
start FFmpeg from a shell but from another process. Again, I can attach
stdin to /dev/null in that subprocess call, but from how I interpret the
docs, that is what `-nostdin` should prevent.
Am I missing anything? Is that a bug in the current FFmpeg version?
Best regards,
Lars
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