node-fluent-ffmpeg - Execute Custom FFMPEG arguments hack

fluent-ffmpeg-custom-args.js

/*
  As at the time of writing this Fluent ffmpeg-API for node.js has not been updated 
  for years and still does not support custom FFMPEG attributes, the only solutions
  are either forking it or resorting to hacks like this one...

  Please use it only when fluent does not support more complex arguments 
  (like generating multi-rendition HLS with all playlists in a single command)
  
  NOTE: this does not support 'progress' event, but you can do it easily by
  parsing 'stderr' event with extractProgress method from fluent-ffmpeg/lib/options.js
*/

const fluent = require('fluent-ffmpeg');

const executeFfmpeg = args => {
    let command = fluent().output(' '); // pass "Invalid output" validation
    command._outputs[0].isFile = false; // disable adding "-y" argument
    command._outputs[0].target = ""; // bypass "Unable to find a suitable output format for ' '"
    command._global.get = () => { // append custom arguments
        if(typeof args === "string") {
            return args.split(' ').filter(c => c !== "" && c !== "\\\n")
        } else return args;
    };
    return command;
};

let cmd = executeFfmpeg('-f lavfi -i testsrc=size=1920x1080:rate=30 -y -t 60 ./test.mp4')
    .on('start', commandLine => console.log('start', commandLine))
    .on('codecData', codecData => console.log('codecData', codecData))
    .on('error', error => console.log('error', error))
    .on('stderr', stderr => console.log('stderr', stderr));
cmd.run();

setTimeout(function() {
    cmd.kill();
}, 5000)

Can you post the full code, please?
Seems like you're trying to access a variable from a different scope.
This will probably help:

let ffmpeg = executeFfmpeg('-f lavfi -i testsrc=size=1920x1080:rate=30 -y -t 60 ./test.mp4')
    .on('start', commandLine => console.log('start', commandLine))
    .on('codecData', codecData => console.log('codecData', codecData))
    .on('error', error => console.log('error', error))
    .on('stderr', stderr => console.log('stderr', stderr))
    .run();

setTimeout(() => {
    ffmpeg.kill();
}, 5000);

Thanks for the reply. Still not working. I had lifted you code pretty much exactly here it is:

const fluent = require('fluent-ffmpeg');

const executeFfmpeg = args => {
  let command = fluent().output(' '); // pass "Invalid output" validation
  command._outputs[0].isFile = false; // disable adding "-y" argument
  command._outputs[0].target = ""; // bypass "Unable to find a suitable output format for ' '"
  command._global.get = () => { // append custom arguments
     return typeof args === "string" ? args.split(' ') : args;
  };
  return command;
   };

var command = 
  executeFfmpeg('-framerate 15 -loop 1 -i snappy.jpg -f rtsp -rtsp_transport tcp -tune stillimage -pix_fmt yuv420p rtsp://localhost:8554      /mystream')
 .on('start', commandLine => console.log('start', commandLine))
 .on('codecData', codecData => console.log('codecData', codecData))
 .on('error', error => console.log('error', error))
 .on('stderr', stderr => console.log('stderr', stderr))
 .run();

setTimeout(function() {
 console.log ('killing it...') 
command.kill();
}, 5000)`

Ah, alright, that's because run() method does not return fluent-ffmpeg object.
Try this:

let command = 
  executeFfmpeg('-framerate 15 -loop 1 -i snappy.jpg -f rtsp -rtsp_transport tcp -tune stillimage -pix_fmt yuv420p rtsp://localhost:8554      /mystream')
 .on('start', commandLine => console.log('start', commandLine))
 .on('codecData', codecData => console.log('codecData', codecData))
 .on('error', error => console.log('error', error))
 .on('stderr', stderr => console.log('stderr', stderr));
command.run();

setTimeout(function() {
 console.log ('killing it...') 
 command.kill();
}, 5000)`

Yes! Brilliant that worked! Thank you very much. So useful. Thanks for sharing and helping!

this can be considered as well https://www.npmjs.com/package/ffmpeg#add-custom-options