Hi Andrea Ferrari,
In order to use Smooth Streaming, you'll need to encode the videos for that. Smooth Streaming actually means that you have one video, but saved in a lot different sizes and having one manifest file that describes the different sizes and their addresses . And when the smooth streaming mechanism detects, that you have better/weaker bandwidth (or CPU capabilities), it'll switch to the other video file.
Having this in mind i don't think is possible to dynamically create for example 10 video files out of the bytes from db, and create the manifest as well. (encode it dynamically).
And also it's not good idea to keep the videos in the db. It's better to encode them as you want to, store them on the server, and keep in the db only the addresses/information for them.
You can read more about smooth streaming here
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