This one should work:
my @cmd = ('/usr/bin/ffmpeg', '-y', '-i', 'long_input.mov','long_outpu
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?
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