Data Pre-processing.

Hi all, 
I am trying to reproduce the result this repo and also newer repo here: https://github.com/neccam/slt
I just wonder how data pre-processed ? 
when I download from 1): https://www-i6.informatik.rwth-aachen.de/~koller/RWTH-PHOENIX-2014-T/
and 2): https://www.cihancamgoz.com/files/cvpr2020/
What is the difference between 2 links ?
Thank you so much !!