Avi Clipper
This is a very useful tool for extracting an interesting section of a movie to keep, send or re-use in a video editor. The starting point is not precise, as the process depends on the availability of key frames. In general, if the cutting point is not a key frame, the starting point will be moved back until a key frame is found. This makes sure that you get all of the segment you are interested in. This should not be a problem when re-using the clipping as most video editors will allow you to shift the starting point later. If the aim is to keep or send the clip, the advantage is clear: there is no loss of quality and the footprint of your video is much smaller than it would be if you had to provide the whole movie.
See also: How to use Avi Clipper