Update on Minetest.

btw. My twitch.tv page is at   http://www.twitch.tv//Bikemare/profile.

I have had a lot of success so far after about eight hours over three days.  It was the holiday weekend so I had time.  I'm still using ffmpeg and sndiod.  I'll try and keep an outline to the parts. 

Serving stream to Twitch.tv
Parts:

1. video
2. sound
3. webcam
4. streaming program
5. authentication and protocol for twitch

Video:
The video pieces are the program (Minetest) and my webcam picture.  I chose to stream my desktop and just send that, though I could just try and send the individual desktop window graphics.  Minetest can grab the whole screen and I'd have to figure out how to "overlay," my webcam picture.  With all the window outlines and title bars, it looks unprofessional.  I'll have to work on this.

Sound: on 12/29/15 Sound is still a problem.  It looks like I might be able to bypass the omnipresent sndiod and record directly from the uaudio web cam.  I did that with ffmpeg and the volume is very low which is a common problem on OpenBSD.
I could get a mic for the /dev/audio0, but I don't know how I'll use that same device for the game.