Animated Gifs are not just a popular medium but hey also work nicely with Federated Wiki.
How to Create Animated Gifs
If you haven't already:
brew install ffmpeg gifsicle imagemagick
Given a movie file (recording.mov), we can convert that to a set of numbered PNGs (in the same folder as the original move file), like this:
ffmpeg -i recording.mov -r 24 recording-%03d.png
The result is a whole lot of PNGs named recording-01.png, recording-02.png etc. Next we need to convert these PNGs into GIFs.
convert recording-001.png palette.gif
The line above creates a GIF from a single PNG as a starting point. Note: you may need to pick a different frame for better results!
convert -dither none -remap palette.gif recording-*.png recording-uncompressed.gif
The result is a single GIF made up from all those PNGs. This step can take quite a while and creates a large uncompressed file.
gifsicle --optimize=3 --delay=4 < recording-uncompressed.gif > recording.gif
Create Animated Gif with Node
Here is a nice write up of creating a service on Digital Ocean to turn MMS videos into animated gifs - twilio.com 
This was achieved using the following combination of technologies:
- Ubuntu 14.04 on a Digital Ocean VPS
- Libav – to process the videos and retrieve the frames
- Imagemagick – to stitch together the animated GIF
- Node.js – to orchestrate and serve the generated animated GIFs
- Twilio – to send and receive MMS messages
Gifshot
JavaScript library that can create animated GIFs from media streams, videos, or images How gifshot uses the following technologies - github.com
Gifmaker
You can alos make animated gifs online at a service like memecenter.com