When I was marketing a horse, I had the tiresome chore of (a) shooting video of the horse in action (b) editing the various shots (c) replicating it, and (d) distributing it.
That was a number of years ago, but now there's help -- Limber Media. It is an online service that will take your video images (miniDV, DVD, or VHS tape), scan it into their online editing service, and help you with production and distribution.
I can see a lot of applications for this service besides selling horses, of course, like sample videos for artists and entertainers, making a whole bunch of "here's the new baby!" videos for distant relatives, teachers distributing mini-lessons on subjects of interest, etc. etc.
I made a video of one of JumperGirl's rounds. The buzzer sounds to signal the rider to start the course, and timing starts when the horse passes the timing mechanism (visible as a tripod against the wall of the Dome). The buzzer at the end indicates that the pair aren't eligible for the jumpoff (another 4-6 fences), because they knocked a rail down.
The problem with the Muybridge images are twofold: the horse isn't a very talented jumper--she isn't using herself well--and the rider appears to be interfering with the horse's natural use of her head and neck in the jumping effort.
(note on the images: I took them all, and manipulated some so the horses' heads are facing to the left). If you want to see all the images, please look at the photo album. Commonly we think of horse jumping having 5 phases:
1. Approach Phase (all the strides between the completion of the recovery phase and the beginning of the take-off phase)
The conclusion of the study is that the results of the freestyle
dressage classes are often biased. The present system of judging should
be permanently checked. The offered method of evaluating agreement
between judges' rankings may help to improve the consistency of judging
and the reliability of the horses' scores.