Hi! I've extracted the bootanimation binary file from Moto E4 system image (Android 7.1.1) and it's working on my Moto E2 with LineageOS 14.1 (Android 7.1.2). I can use video files as bootanimation (I've used the Hello Moto bootanimation from the same Moto E4 system image). You can download and test it. The .zip file will backup your old bootanimation binary and copy the new one.