It looks like you are using the wrong stream name here. Try this (Assuming you set this up according to the guide):
You need the .smil file, along with all the video files you refer to in the .smil file, located in the /content folder.
Follow the guide you linked to in your first post, get it working with the sample.mp4 file, then make sure the videos you want to stream are in the content folder, and change the smile from this:
To something like this:
<video src="mp4:sample.mp4" start="5" length="5"/>
<video src="mp4:you-file.mp4" start="5" length="5"/>