function parseVideo($path){
        $out = new stdClass();

        $path = escapeshellarg($path);
        $data = json_decode(shell_exec("ffprobe -v quiet -print_format json -show_format -show_streams $path"));

        $has_video=0;
        $has_audio=0;

        $out->audio_bitrate = 0;
        $out->video_bitrate = 0;

        foreach($data->streams as $input){
            if($input->codec_type == "audio" && $has_audio == 0){
                $has_audio = 1;
                $out->audio_bitrate = $input->bit_rate;
                $out->audio_codec = $input->codec_name;
            } else if($input->codec_type == "video" && $has_video == 0){
                $has_video = 1;
                $out->video_bitrate = $input->bit_rate;
                $out->video_codec = $input->codec_name;
            }
        }

        $out->filesize = $data->format->size/1024; // filesize in kilobytes
        $out->duration = intval($data->format->duration); // Video duration in seconds
        $out->combined_bitrate = $data->format->bit_rate;

        return $out;
    }

    function convertVideo($source_path,$hash){
        $video_info = parseVideo($source_path);

        $vcodec;
        $acodec;
        $x264opts = "";
        $audio_opts = "";

        if($video_info->video_codec == "h264" && $video_info->video_bitrate < 1048576){
            $vcodec = "copy";
        } else {
            $vcodec = "x264";
            $x264opts = "-x264opts bitrate=756:vbv-maxrate=756:vbv-bufsize=378";
        }

        if($video_info->audio_codec == "aac" && $video_info->audio_bitrate < 1024*164){
            $acodec = "copy";
        } else {
            $acodec = "libfdk_aac";
            $audio_opts = "-ab 128k";
        }

        $command = "/usr/bin/ffmpeg -i $source_path $x264opts -vcodec $vcodec -acodec $acodec $audio_opts -movflags +faststart -preset faster /var/www/media/video/{$hash}.mp4 -y >/var/www/ffmpeg_logs/{$hash}.log 2>&1 &";

        if(!file_exists("/var/www/media/video/$hash.mp4")){
            $ffmpeg_log = "/var/www/ffmpeg_logs/$hash.log";
            if(file_exists($ffmpeg_log))
                @unlink($ffmpeg_log);

            shell_exec($command);
        }
    }