Ask HN: iBooks Author for other platforms?

I want to selfpublish my next book and was looking at options available. It's a fitness related book and I wanted to include lots of media (video) if possible.

This led me to iBooks Author on suggestion from a few folks, but that would obviously be tied to the iPad.

My question, are there ways or options for non-iPad users (Kindle, Android, Ubuntu) that would allow me to use video in a e file[1]?

[1] - I don't care much about iBooks Author's fancy interface. I typically write up everything by hand anyway. That isn't the challenge, it seems, rather the resulting electronic file.