That example from Charlie our CTO is for taking a snapshot using the new HTTP Provider that he's provided in that example. As you can see it now can be done without the need of the Transcoder.
This can quickly take a snapshot of the current live frame of the live stream referenced in the URL.
You can call this from anywhere and redirect the output to a file to automatically save your snapshot. For example, some customers have used the original thumbnail HTTP Provider by call it using curl/wget and redirecting the output, e.g.
The new HTTP Provider should be able to be called the same way (though I've not tested the new one myself yet).
curl "http://[WOWZA-IP:8086/transcoderthumbnail?application=live&streamname=myStream&format=jpeg" > myStream.png
wget "http://[WOWZA-IP]:8086/transcoderthumbnail?application=live&streamname=myStream&format=jpeg" -O myStream.png