Beginning in 1.4, SlideShowPro Director has the ability to extract thumbnails from your uploaded videos, thus allowing you to use those thumbnails as video previews. Director depends on software called FFmpeg to do this, and automatically finds and uses FFmpeg if it is installed on your server.
To see whether Director has found FFmpeg on your server, visit the "System info" screen. If FFmpeg is not active, you will need to ask your host or system administrator to install it for you. Once they have, you can tell Director where it is installed by adding a line like this to your config/user_setup.php file:
define('FFMPEG_PATH', '/path/to/ffmpeg');
If you have any questions about what path to input into the line above, ask your host.