“thousandths” as a function of distance measure?
Measuring to that degree is highly questionable in its benefits/accuracy, given the variables in fliming, playback.
Unless you are on a tripod with the same exact sightline, focus, same exact fps speed, neither time nor distance measued to that degree would represent an accurate measure excepting comparing clips shot consecutively? And even then the accuracy comes only from being roughly “equally inaccuracte”
Any clip that would show something that one would wish to measure, involves “panning” to shoot the clip.
So short of the laser measuring that has gone from engineering to field events, nothing shot on camera could be accurate to that level. Then there is the pixel content/quality of your TV or PC’s video screen… the variables are almost endless!
Can you tell me what aplication you are trying to measure to that fine a point? Perhaps there is another way?
(I am guessing there is some dispute over Mrs. Toddler just missing setting some kind of 20k course record and you are trying to get the bonus monies by nailing down the course measure or her time accuracy ???)