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var videoUrl = 'https://dl.dropboxusercontent.com/u/17698405/bla.mp4';

var cmd = '-i myfile.mp4';
var args = parseArguments(cmd);
var sizeToDownload = 200*1024;

retrieveVideo(videoUrl, sizeToDownload, function(fileData) {
	ffmpeg_run({
		arguments: args,
		files: [{
			name: 'myfile.mp4',
			data: fileData
		}],
		print: print,
		printErr: print	
	});	
});

function parseArguments(text) {
  text = text.replace(/\s+/g, ' ');
  var args = [];
  text.split('"').forEach(function(t, i) {
    t = t.trim();
    if ((i % 2) === 1) {
      args.push(t);
    } else {
      args = args.concat(t.split(" "));
    }
  });
  return args;
}


function retrieveVideo(path, fragment_size, callback) {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", path, true);
  xhr.responseType = "arraybuffer";
  xhr.setRequestHeader ('Range', 'bytes=0-' + (fragment_size - 1));

  xhr.onload = function (oEvent) {
    var arrayBuffer = xhr.response;
    if (arrayBuffer) {
      callback(new Uint8Array(arrayBuffer));
    }
  };

  xhr.send(null);
}

var textarea = document.getElementsByTagName('textarea')[0];

function print(text) {
	textarea.value += '> ' + text + '\n';
}

* { box-sizing: border-box }
html,body { height: 100%; margin: 0; padding: 0; overflow: hidden }
textarea { width: 100%; height: 100%; }

<script src="https://rawgit.com/bgrins/videoconverter.js/master/build/ffmpeg-all-codecs.js"></script>
<textarea></textarea>