VIM1 Android Pie - Video play problem

With the [VIM1 Android Pie V190823 ROM Release] I run into a problem:
hardware decoding turns video too dark, hard to see details.
I tryed with diferent programs: mxplayer, kodi (and more) - allways the same problem.
By now I reverted to Nougat.
It’a a problem with the ROM or just with my VIM1?