QT rtsp:// mp4 streams are a big problem. You can try to change mdatrtsp:// onto rtsp:// and then use the link in
HiDownload,
MovRecorder,
VLC player,
MPlayer.
I would give 95% that it can only be recorded with
screen video capture software.
p.s.
Related thread:
Manage MovRecorder or other stream recorder to record rtsp:// .mov QT streaming video