There is also another option, hyperion.ng introduced a new capture mode for the amlogic grabber. It's done directly via GE2D / amvideo and not by amvideocap anymore.
It needs additional kernel patches : Commits · Arakmar/linux-amlogic-le · GitHub
It works just fine for the hardkernel kernel. But I haven't manage to get it working on the Librelec amlogic kernel, it captures just a black screen.
I need to investigate that a bit more when I'll have time.
This is a new hope: where can i find a compiled version of hyperion.ng for wetek hub, please? (no, i'm not able to compile one)
For the new kernel, will it be distributed with next versions of LE?