ffmpg android命令给出错误

Question

我在Android上使用ffmpg包装器覆盖gif视频 我的命令是

        String vidpath=Environment.getExternalStorageDirectory()+"/WhatsApp/Media/WhatsApp Video/vid.mp4";
        String gifpath=Environment.getExternalStorageDirectory()+"/WhatsApp/Media/WhatsApp Video/vid.gif";
        String outpath=Environment.getExternalStorageDirectory()+"/out.mp4";
         ffmpeg.execProcess(new String[]{
            ffmpegBin,
            "-i",
            vidpath,
            "-i",
            gifpath,
            "-filter_complex",
            "\"overlay=x=(main_w-overlay_w)/2:y=(main_h-overlay_h)/2\"",
            //"640x388",
            out_video_path




        },sc);

我的execProcess方法是

 public void execProcess( String[] cmds, ShellCallback sc) throws Exception {        


        ProcessBuilder pb = new ProcessBuilder(cmds);
        pb.redirectErrorStream(true);
        Process process = pb.start();      

        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));

        String line;


        /*switch(command_call_type)
        {
        case Keys.KEY_COMMANDEXE_TYPE_MERGEFRAME:

        //  refincereference.updateLoadingbar(30);
            break;

        }*/

        while ((line = reader.readLine()) != null)
        {
            if (sc != null)
            {
                sc.shellOut(line.toCharArray());

            Log.e("FFMPEG", line.toCharArray()+"");


            }
        }



        /*switch(command_call_type)
        {
        case Keys.KEY_COMMANDEXE_TYPE_MERGEFRAME:

            //refincereference.updateLoadingbar(40);
            break;

        case Keys.KEY_COMMANDEXE_TYPE_CLIPMP3:
            //refincereference.updateLoadingbar(60);
            break;
        case Keys.KEY_COMMANDEXE_TYPE_MP3TOM4A:
            //refincereference.updateLoadingbar(80);
        break;

        }*/


        /*
        if (process != null) {
            process.destroy();        
        }*/

}

并且错误来自行对象，没有这样的文件或目录 但它总是给出错误，gif文件不存在我已经用FIle.exist（）检查了它虽然它给出了错误请帮帮我