Does 'ubersense' just slow down the playback by repeating frames or does it create false frames as some recent post-processing applications do?
You need to record high speed video at higher rates than 30 or 60 fps to properly see what is going on in the serve and other faster motions. If an application creates false
frames in order to slow down the playback it would be misleading
for analysis as to what is really happening.
This forward racket motion of the serve occurs over about 20 milliseconds.
At 30 fps a video camera takes one frame every 33 milliseconds, at 60 fps every 17 milliseconds. 30 and 60 fps are not adequate frame rates to fully show the racket & arm motion as they move forward over just 20 milliseconds to hit the ball.