Concat audio and video on fluent-ffmpeg

Question

Im triyng to concat audio and video with the library fluent-ffmpeg but it is not workyng. Anyone can help me?

var proc = ffmpeg(firstFile)
    .input(secondFile)
    .input(thirdFile)
    .input("./musicas/1.wav")
    //.input(...)
    .on('end', function() {
      console.log('files have been merged succesfully');
    })
    .on('error', function(err) {
      console.log('an error happened: ' + err.message);
    })
    .mergeToFile(outPath);

Answer 1

Use the events after the mergeToFile method is called.

var proc = ffmpeg(firstFile)
    .input(secondFile)
    .input(thirdFile)
    .input("./musicas/1.wav")
    .mergeToFile(outPath);
    .on('end', function() {
      console.log('files have been merged succesfully');
    })
    .on('error', function(err) {
      console.log('an error happened: ' + err.message);
    })