Ah just happy to stop playing with it 
now i need tinkering again
the binary have to be stored in the ESP or can it be somewhere in filesystem?
The boot animation theme is located in /usr/lib/firmware/{your_custom_boot_theme} that will be loaded by the kernel parameter bootsplash.bootfile=.
The boot animation file will be added into initramfs by initcpio-install-script
bootsplash.bootfile=bootsplash-themes/manjaro-man/bootsplash
it needs part of the path …
See how to create your own custom theme for any arch distros, not only manjaro.
You can use bootsplash-manager to test your custom theme if it looks good. It is available in AUR.
See options of bootsplash-packer for custom position and color of boot theme
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