no the same sort of time changes do NOT occur throughout the video. yes there is a fluctuation in the appearance of the time stamp when run at normal speed. slow it down and you will see every second count off, one by one. it will require you to go frame by frame, however the average rate is as it should be 2 frames of analog video to every 30 frames of digital video at a rate of 30fps. go back and read what it is i am saying. everywhere in the video the rate of movement for every single moving object in this video is approx 1 step of movement every 15 frames, as one would expect them to be. the only exception to this is during the 12.5 seconds in question and in that segment the man remains in a movement stance for 121 frames, as the time stamp continues, for 4 seconds. the time stamp comes from the analog video. as does the video of the man. the ONLY way that the time stamp can continue to count off seconds and that man not move, though in a moving pose for 121 frames is if the video has been digitally altered or physically editing by cutting and splicing the film.
and the camera does not oscillate at the same rate during the segment im questioning. the oscilation is at a rate of 1 complete up/down cycle in 395 frames. everywhere else it completes one up/down cycle every 30 frames.
again i insist you go through the piece frame by frame, otherwise you're ignoring the evidence and making conclusions based on pure conjecture.