Common image file extensions:

• .bmp
• .jpg
• .gif
• .png

Video related file extensions:

• .swf
• .wmf
• .mov
• .avi

Video formats which dynamicly redirects and streams data can still be a little problematic. However, adding above file extensions will work with most websites, and make it possible to download complete video and image galleries.

If you only want to download images and videos
This is done by controlling the file extensions listed in the output filters / list filters. If you only include videos and images file extensions and mime types, that is all you will have downloaded at the end of the website scan.

At this point, you just need to set website root path and start downloading
For more information, see this website download tutorial.