That's because "reaction flv" is the name on the channel that posted that video to Youtube. As for the risks of Flash, that's only a problem if you've still got Flash ...
This code has been tested on Ubuntu20.04 with Cuda 11.1/11.3/11.6, Python3.8/3.9 and Pytorch 1.11.0/1.12.0. Get the code. Download and unzip our preprocessed datasets (for convenience), you can also ...