如何增加ffmpeg在php-ffmpeg中添加水印速度？

如何解决如何增加ffmpeg在php-ffmpeg中添加水印速度？

我正在尝试在15-35秒持续时间为8-10 MB的视频中添加水印。该过程所花费的时间超出了预期的30-40秒。这是我的代码：

$ffmpeg = FFMpeg\FFMpeg::create(array(
            'ffmpeg.binaries'  => ffmpeg_lib,'ffprobe.binaries' => ffprobe_lib,'timeout'          => 3600,// The timeout for the underlying process
            'ffmpeg.threads'   => 12,// The number of threads that FFMpeg should use
        ),null);
        $ffmpeg_string = ffprobe_lib;
        
        
        $tempFile=rand().time();
        $outputFile='tmp/'.$tempFile.'.mp4';
       
        $video = $ffmpeg->open($videoURL);
            
        $watermarkPath = watermark_Path;
        $video
            ->filters()
            ->watermark($watermarkPath,array(
                'position' => 'absolute','x' => 20,'y' => 10,));
        $text="@".$username;
        $command = "text='$text': fontcolor=white:fontfile=OpenSans-Bold.ttf: fontsize=18: x=20: y=70:";
        $format = new FFMpeg\Format\Video\X264();
        $format->setAudioCodec("aac");
        
        try
        {
                
                $video->filters()->custom("drawtext=$command");
                $video->save($format,$outputFile);
                
                $array_out = array();
                $array_out[] = 
                array(
                    "download_url" => checkVideoUrl($outputFile)
                );
                
                $output=array( "code" => "200","msg" => $array_out);
                print_r(json_encode($output,true));
                
        }

我的代码有什么问题吗？如何提高速度？任何帮助都是可观的。