When I change sdcard from LE8 to LE7 sd, the same device play the same movie from the same source without problem
What part of this is so hard to understand?
Do not compare Krypton to Jarvis. Kodi Krypton has a very different approach to Video decoding that stresses CPU more.
The 7.0.3.12j was perfect.
If you already have a perfect build at your fingertips, what are you hoping will improve?