FFmpeg - cannot find ExecuteBinaryResponseHandler - Android/Java

I am trying to make a module for react-native that will change a video into a gif. I have little to no experience with android studios/java, but I would love to learn more! I am using this library to convert the video to a gif. Here is my code:

package com.reactlibrary;

import android.widget.Toast;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.github.hiteshsondhi88.libffmpeg.FFmpeg;

public class RNGifMakerModule extends ReactContextBaseJavaModule {

  private final ReactApplicationContext reactContext;

  public RNGifMakerModule(ReactApplicationContext reactContext) {
    super(reactContext);
    this.reactContext = reactContext;
  }

  @Override
  public String getName() {
    return "RNGifMakerModule";
  }

  @ReactMethod
  public void alert(String message) {
      Toast.makeText(getReactApplicationContext(), "Error", Toast.LENGTH_LONG).show();
      String[] cmd = {"-i"
              , message
              , "Image.gif"};
      conversion(cmd);
  }

  public void conversion(String[] cmd) {

    FFmpeg ffmpeg = FFmpeg.getInstance(this.reactContext);

    try {


      // to execute "ffmpeg -version" command you just need to pass "-version"
      ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {

        @Override
        public void onStart() {
        }

        @Override
        public void onProgress(String message) {
        }

        @Override
        public void onFailure(String message) {
        }

        @Override
        public void onSuccess(String message) {
        }

        @Override
        public void onFinish() {
        }
      });
    } catch (FFmpegCommandAlreadyRunningException e) {
      // Handle if FFmpeg is already running
      e.printStackTrace();
    }
  }
}

And I get this error:

Error:(43, 31) error: cannot find symbol class ExecuteBinaryResponseHandler

This seems odd to be, because in the documentation for ffmpeg-android-java it says to use almost exactly the same code.

Bounty

The bounty will be awarded to you if you can find a way to convert a video.mp4 into a gif. You do not necessarily have to use FFmpeg, but your solution has to work with java/android studios.