As I understand, another way is switch to H264 encoding?
BTW, pack=none crashes nxnode.bin like
[ 2355.810759] traps: nxnode.bin[9475] general protection ip:7f88b46692f0 sp:726a8a7186908967 error:0 in libc-2.23.so[7f88b4634000+1c0000]
Thoughts out loud: I wonder why the program launched through ssh -X (firefox in this case) drawing more faster (scrolling, as example) than in the NoMachine with X11 vector graphics. Over 1G link.
P.S. Thanx, your solution work.