[popcornmix]

Thanks, it worked now. I would think it is much easier to have it as part of the image though. If it requires a 5MB download anyways, why not just download it together with the image?

Well, some users update virtually every day, so it's a choice of 5MB every day, or 5MB just once (the current scheme won't download the video if it's already present).
Not saying that 5MB every update is completely unreasonable, but it is an argument for continuing with the current scheme.

Also, I actually very much like the animation, but the "cut" between the animation and the Isegard screen is quite harsh. Not sure how it can be done better, but maybe some creative minds have some ideas.

You probably also want to add:
"disable_splash=1" to config.txt
nosplash to cmdline.txt
<splash>false</splash> to advancedsettings.xml

to remove the other splash sceens and keep the boot clean.