Free Video to GIF Converter is a freeware utility which can convert video to gif animation simply and fast. It can convert almost all popular video formats to gif, including mp4, avi, mpg, wmv, flv, mov, vob, mkv, rmvb, etc.
If the video is long, it is possible to trim it and convert only a segment of video to gif. You can also set the output gif's width and height, change the GIF animation speed. The highlight is that you can remove unwanted frames from the GIF, just like a professional GIF editor can do.