I just did a side project at work dealing with live streaming, it's actually fairly simple if you understand ffmpeg. You can stream DASH like this:

    ffmpeg -i [...] -codec:v libx264 -profile:v baseline -pix_fmt yuv420p -codec:a aac -tune zerolatency -f dash -window_size 5 /tmp/live/live.mpd

Check out the ffmpeg-formats man page for a list of options you can use with -f dash. Then serve /tmp via nginx and point the reference client [0] at your mpd file. Tada!

You might want to use the nginx RTMP module, too, if you want to receive an RTMP stream from e.g. obs and wang-bang it into DASH.

[0] http://reference.dashif.org/dash.js/v2.6.8/samples/dash-if-r...

I'll write up a more detailed blog post at some point.