let spawn = require('child_process').spawn;
let fs = require('fs');

let str = `-ss 00:00:11.879 -i pipe:0 -t 00:00:05.000 -c:a aac -ar 44100 -r 30 -pix_fmt yuv420p -c:v libx264 -strict -2 -profile:v main -level 3.0 -crf 25 -preset veryfast -filter:v crop=720:720:183:0 -movflags frag_keyframe -f mp4 pipe:1`;
let args = str.split(' ');


let trans_proc = spawn('ffmpeg', args);


let input = fs.createReadStream('input.mp4');
let output = fs.createWriteStream('output.mp4');
let closed = false;

input.on('data', (data) => {
   if (!closed) {
      trans_proc.stdin.write(data);
   }
});

trans_proc.stdout.pipe(output);


trans_proc.stdin.on('close', () => {
   console.log('stdin close');
});

trans_proc.stdin.on('drain', () => {
   console.log('stdin drain');
});

trans_proc.stdin.on('error', (e) => {
   console.log('stdin error');
   if (closed) {
      console.log('finished');
   }
});

trans_proc.stdin.on('finish', () => {
   console.log('stdin finish');
});

trans_proc.stdin.on('pipe', () => {
   console.log('stdin pipe');
});

trans_proc.stdin.on('unpipe', () => {
   console.log('stdin unpipe');
});



trans_proc.stdout.on('close',  () => {
   console.log('stdout close');
});

trans_proc.stdout.on('data',  () => {
   //console.log('data');
});

trans_proc.stdout.on('end',  () => {
   console.log('stdout end');
   closed = true;
});

trans_proc.stdout.on('error',  () => {
   console.log('stdout error');
});

trans_proc.stdout.on('readable',  () => {
   //console.log('stdout readable');
});




trans_proc.on('exit', function(code, signal) {
   //processExited = true;

   if (signal) {
      console.log(`ffmpeg was killed with signal ${signal}.`);
   } else if (code) {
      console.log(`ffmpeg exited with code ${code}.`);
   } else {
      console.log('done');
   }
});