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This one should work:
my @cmd = ('/usr/bin/ffmpeg', '-y', '-i', '','long_outpu +t.wav');
Are you sure it doesn't work? And that it matches the command line that does work?

Update: And taking a step back, does system(@cmd) work?

Update2: Does long_output.wav exist at the time of execution? Is it possibly created within the script and you didn't close a filehandle yet?

In reply to Re: Using IPC::Run to kill stuck process by runrig
in thread Using IPC::Run to kill stuck process by filmotheklown

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