If that’s your link, you should update my V3 FEL test to V4, since it fixes the freeze issues after L1.
The problem is that some FEL videos will freeze near the end, so I doubled the file length as a workaround so it freezes later. It can still properly test FEL + L1 + L2 + L8 + L5.
btw, the woman test file cannot properly test the RPU, and that flash you see is just a buggy reaction to the RPU reshaping metadata. That will even happen on a player that can’t process the dynamic metadata at all, such as MPC on PC.