For those Technophiles out there who are into capturing and analysing their sporting performance.
I have found and been using a piece of free software Kinovea. It allows you to analyse any captured video, make measurements, slow down, mark up, etc.
I've been using it to make some bike fit measurements, such as leg angle, knee drop, arm position, etc.
The best feature is it's free! Just thought there must be others interested in this sort of stuff.
It is one of the few trial / free motion capture software packages that i could get to read a standard AVI file that my camera spits out. The other ones all produced either an error with the filer or missing codacs. Kinovea just worked.
The only issue you have when using a standard video capture device is that that have a "rolling shutter' and you will get blurry motion in some frames. So if you use body markers and try and track these markers sometimes it will miss the marker. For 90% of what we need with a basic setup on the trainer it is a great tool. Even most of the video bike fit companies don't use the high end "shuttered" cameras.
What i did was set the trainer up with a black sheet for the background. Then wear black longs and all back shoe covers. Use bright high contrast circles on the hip bone, knee, ankle and pedal axle. Also do this for the arms etc. Makes it easy to measure the angles through the full motion. Also give the tracking a go and see how it goes.
Film at about 80-90% effort at normal cadence. Great for slow motion / frame by frame and picking up issues with set up / technique.
Check out the de-lacing feature. This may clear up the image a little better.
What I would really like, and its what I think you are referring to in your post, is a motion tracking package. Where I can track my hip, knee or heel position through each pedal stroke.
Thanks Darren for the ref. - looks very capable! Will have a mess with bike position over Xmas, but can see applications for both work and play.