This may help: 
my $mp3 = <binary contents of an mp3 file already in memory>;

$pid = open(PLAY, "| ffmpeg -i pipe:0") or die "Couldn't fork: $!\n";
print PLAY $mp3;
close(PLAY) or die "Couldn't close: $!\n";

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In reply to Re: Passing an in memory scalar to an external command as an argument by pme
in thread Passing an in memory scalar to an external command as an argument by Rodster001

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