Why you need it ?

If you have too many files in a folder, it affect performance of the server.

You can try editing functions_upload.php

Find

Code:
            $video_folder = floor($convert_vid / 1000) + 1;
            $video_folder = md5($video_folder);
            $video_folder = substr($video_folder, 1, 10);
            $video_folder = trim($video_folder);
            $video_folder .= '/';
Replace with

Code:
            $video_folder = '';