缩放并覆盖多张图片ffmpeg android错误

Question

我正在尝试在背景上的图像上放置多张图像/ gif。但是我无法缩放覆盖前的所有图像。

 String[] command=new String[13];
        command[0]="-i";
        command[1]=input;
        command[2]="-i";
        command[3]=thumbnail2;
        command[4]="-i";
        command[5]=thumbnail;
        command[6]="filter_complex";
        command[7]="[0:v]scale=0:0[base]";
        command[8]="[1:v]scale=30:-1[img1]";
        command[9]="[2:v]scale=3000:-1[img2]";
        command[10]="[base][img1]overlay=70:70[tmp1]";
        command[11]="[tmp1][img2]overlay=(main_w-overlay_w)/2:y=(main_h-overlay_h)/2[out]";
        command[12]="/storage/emulated/0/Pictures/logo-2000.gif";

        fFmpeg.execute(command,
                new ExecuteBinaryResponseHandler() {

                    @Override
                    public void onStart() {
                        //for logcat
                        Log.w(TAG,"Cut started");
                    }

                    @Override
                    public void onProgress(String message) {
                       Log.w(TAG,message.toString());
                    }

                    @Override
                    public void onFailure(String message) {

                        Log.w(TAG,message.toString());
                        Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_SHORT).show();

                    }

                    @Override
                    public void onSuccess(String message) {

                        Log.w(TAG,message.toString());
                        Toast.makeText(getApplicationContext(),"sucessfully saved",Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onFinish() {

                        Log.w(TAG,"Cutting video finished");
                    }
                });

请帮助同时缩放图像。
我遇到的错误是：

  

[NULL @ 0xb3211e00]无法找到适合的输出格式   'filter_complex'filter_complex：无效的参数