I didn't find any correct Dockerfile or instructions on how to install Emby on top of armhf architecture so I had to combine some of them and as a result here is working Emby Docker image - https://hub.docker.com/r/kayrus/emby/
I've tested it on my Cubietruck with Debian Wheezy and Linux kernel which supports Docker (>=3.6). For example Armbian for Cubietruck has Linux kernel v4.2.3. In any case even if you don't have Docker you can try to install Emby just following Dockerfile manually.
What doesn't work: direct play for all my h.264 MKV videos using web browser (for example direct