If you want to create a gif that represents the complete video in a short gif loop have a look at https://github.com/marlev/gifserver

"I spent hours googling for a service that creates an animated gif from a video, that represents the complete video. I only found solutions that animated the first 10 frames, the first 30 seconds etc. So i decided to create gifserverthat will represent the complete video with 9 looping frames,no matter how long the original file is."