One of the dangers, as pointed out here, is that camera angle, especially due to the foreshortening of the field can be very deceptive. My experience has been that the best video analyis is done in an inside studio environment that has been carefully set up to be the same way every time. Setting up the cameras (down the line and face on views) and taking them down day after day introduces all the errors spoken of here. If you are going to build a video setup outside, it is a good idea to build a template for the set up, such as sewn together straps (like seat belt material) which can be nailed into the dirt, taut and square, as a reference grid for your cameras. This will really help......
Justathought,
Obi WunPutt
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