I recorded myself using my camera (canon ixus 117hs, 23.98fps) and also recorded my LG G3 using AZrecorder (records the screen at 55.58fps). I tried to sync both videos (using premiere pro cc) and at some point they go out of sync, maybe because of the difference in the fps? and if so, what can I do with it? Thank you.
55.58 is not a standard frame rate so it's the one that should be changed. Using the 23.98 video as a reference, pick a point late into the video where you can determine how many frames (at 23.98 fps) it's out of sync with the 56 fps video. Compute the ratio of the length in frames up to that point, to the number of frames out of sync. Then time stretch the entire 56 fps video -- either shorter of longer as needed -- using that ratio.