I stumbled on a solution to this problem. I had the same problem with my Phantom 4 out of the box. This is my first drone so I am/was really a novice. I found a video that explained that the jerkyness was likely due extremely high shutter speed. With the settings set to "auto" the camera will run the shutter speed up extremely high in order to reduce the amount of light entering the camera. The video recommended manually setting the shutter speed to no more than twice the fps. I used 1080p at 30 fps. So I set the shutter speed to 60. Making these changes removed ALL of the jerkyness. I was then able to produce great quality video. However, by manually reducing the shutter speed, and therefor allowing more light to enter the camera, I also had to add ND filters to reduce the light so that my mid-day videos were not washed out. Night time videos are great without a filter. Morning and late afternoon videos may be okay without filters, but sometimes I still put one on depending upon the brightness. This may not fix everyones jerkyness problems, but I did solve the ones I was having.