Get full command-line string from child_process.spawn

I'm spawning a process with child_process.spawn(). How can I view the exact command line that is executed (including all command-line parameters passed into the spawn function)?

Here's my example that isn't working:

var s = require('child_process');
var p = s.spawn('ffmpeg', ['-probesize 1024', '-i "rtsp://192.168.1.10:554/11"', 'test.h264']);

When I capture the stderr, I get a message "Unrecognized option 'probesize 1024'. However, if I run ffmpeg from the command line, it works fine. So I need to see exactly how the command-line options are being mangled before being sent to FFMPEG in order to debug this.

Thanks

Try

var p = s.spawn('ffmpeg', [
    '-probesize',
    '1024',
    '-i',
    'rtsp://192.168.1.10:554/11',
    'test.h264'
]);

Command line arguments that have a space between them but are coherent, still need to be separated. So there's needs to be a space between -probesize and 1024

Update

If you would like to keep the coherent arguments together, add shell: true to the options object:

var p = s.spawn('ffmpeg',
    [
        '-probesize 1024',
        '-i "rtsp://192.168.1.10:554/11"',
        'test.h264'
    ],
    {
        shell: true
    }
);