Memory: 498224K/786432K available
    (10240K kernel code, 1452K rwdata, 2900K rodata,
    1024K init, 613K bss, 26064K reserved, 262144K cma-reserved)

Add the following into /boot/config.txt

gpu_mem=256

# Default cma is 262144K.
dtoverlay=cma,cma-size=402653184