kill all child_process when node process is killed

Question

How do i make sure all child_process are killed when the parent process is killed. I have something like the below one.

Even when the node process is kill i see that FFMPEG continues to run and the out.avi is generated. How can i stop FFMPEG from running after the node process exits.

var args = "ffmpeg -i in.avi out.avi"
child_process.exec(args , function(err, stdout,stderr){});

child_process.exec(args , function(err, stdout,stderr){});

Answer 1

You need to listen for the process exit event and kill the child processes then. This should work for you:

var args = "ffmpeg -i in.avi out.avi"
var a = child_process.exec(args , function(err, stdout,stderr){});

var b = child_process.exec(args , function(err, stdout,stderr){});

process.on('exit', function () {
    a.kill();
    b.kill();
});