It turned out the app doesn't depend on system FFmpeg as it has it own FFmpeg v4.4.2
Problem is solved by installing another app version.
Btw, i recommend everyone to use that application except Claus coz he doesn't like it
It uses Opengl render and it supports audio forwarding via Wifi.
1st click on install sndcpy - start audio then your phone sound will be forwarded to your computer.