To date I have almost exclusively taken videos using 1080 at 50 fps. 1080 because it is a full screen 16:9 format and the maximum resolution of my TV and PC screen..............50 fps because most of my videos are fast moving action. I use Sony Movie Studio 12 and rendering options exist for 1080 so everything seems to fit.
My question is that with action cams now offering a far greater range of resolutions..up to 4k....and framespeeds beyond 50/60 fps, how are these best managed in post? So for example 1080 at 90 fps. Can the video be rendered at 90fps? What benefit is there in using 2.7k or 4k unless the viewing platform has a maximum resolution of 1080?