I have the following FFmpeg command working in the terminal but i want to use it programmatically. I cant understand how to cover the complex filter to fluent-ffmpeg.
Here is the command: ffmpeg -y -i input1 -i input2 -filter_complex "[0:0][1:0] amix=inputs=2:duration=shortest" -c:a libmp3lame output.mp3 Here is my attempt:

    .input("input1.mp3")
    .input("input2.mp3")
    .complexFilter([
      {
        filter: "showfreqs",
        options: { s: "200x100" },
        inputs: "0:a",
        outputs: "[freqs]",
      },
      {
        filter: "format",
        options: { pix_fmts: "yuv420p" },
        inputs: "[freqs]",
        outputs: "[vid]",
      },
    ])
    .outputOptions(['[0:0][1:0]', 'amix=inputs=2:duration=shortest'])
    .outputOptions("-c:a libmp3lame")
    .save('out.mp3')
    .on('error', function(err, stdout, stderr) {
        if (err) {
            console.log(err.message);
            console.log("stdout:\n" + stdout);
            console.log("stderr:\n" + stderr);
          
        }
    })```