the issue is the refresh rate timing - not the specific "GTF / CVT / SMPTE"
49.929HZ is not 50.000Hz - in a 25Hz/50Hz system
if you are mixing parrots cameras matrixes -
and parrots are giving you the wrong timing - default parrot settings need changing….
if you use a 49.929Hz refresh you will get glitching with almost every other type of video equipment