Streaming videos from RoboHelp server

The quick suggestion is to use YouTube's excellent (free) service to host your video clips. Your RoboHelp authoring tool makes it easy to insert YouTube streaming video clips into your projects. If that is not possible, here are some tips and things to think about:

1. I'm not aware of any video file-specific requirements for RoboHelp Server to deliver .mp4 files. Observe best practices for encoding your video files (even more important than individual file size.) In particular the bitrate, frame rate and resolution used. 
2. You asked if RoboHelp Server provides "streaming capability".  The term "streaming" is often misunderstood. A true streaming server would use the rtsp://  (Real Time Streaming Protocol) and requires a more expensive network infrastructure. It's unlikely you would need rtsp. (RoboHelp Server does not use the rtsp protocol.)
3. The vast majority of knowledge base or help system projects are delivered to hundreds or perhaps a few thousand simultaneous visitors behind a firewall and are not public facing. Certainly you would want a decent powered web host (in-house or commercially-hosted) 
4. I highly recommend looking at Adobe Media Encoder to optimize your videos. If you have the Adobe Technical Communication Suite, you automatically have Adobe Captivate and the excellent Adobe Media Encoder available for free. Here is a link to info on Adobe Media Encoder. https://helpx.adobe.com/media-encoder/user-guide.html 
5. If you want to get into the weeds on streaming and encoding, etc. here is an informative link:
6. https://medium.com/canal-tech/how-video-streaming-works-on-the-web-an-introduction-7919739f7e1

Let us know if you need more. 

John

I can't help you with this one but I have reached out to someone who can. He will get back to you in soon.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.