Video Screenshots….Seems easy right?

I have about 1500 videos my client has shot that we are going to sell online using woocommerce and wordpress. I have them uploaded and ready to add as products, but I have discovered that the app doesn’t automatically create a screenshot or short video sample for each video.
Does anyone know of a program that I could set up all the videos in that would either create a screenshot from the first few seconds OR automatically create a snippet of the video that is maybe 10 or 15 seconds long?
I know it is a big ask but you never know….
Thank you in advance!
Answer #1
Not quite sure what you want, nut have a look at this page..The last 2 topics concern web stuff..
https://www.google.com.au/search?q=generate+previes+of+videos&ie=utf-8&oe=utf-8&gws_rd=cr&ei=sxmZVJfPMMjf8AWLhIL4DQ
Answer #2
https://wordpress.org/plugins/video-thumbnails/#
Answer #3
Look into an app called Topaz Moment Production Edition.