to include a videofile, say for example 140516_Dokspace_1080p.mp4, embeded with a player for direct playback.

you need the download-link of said download-fact.

then, edit the fact you want to include the audiofile with controls in, and in HTML-Mode add:

<video preload="auto" controls="controls" width="720" height="297">

 <source src="http://doku.factlink.net/fsDownload/140516_Dokspace_1080p.mp4?v=1&forumid=101&id=5938925&directdownload=1" type="video/mp4" />

 <p>To view this video please enable JavaScript, and consider upgrading to a web browser that <a href="http://videojs.com/html5-video-support/" target="_blank" class="link">supports HTML5 video</a></p>

 </video>

where in src=" " you paste the download-link and add "&directdownload=1" like in the example above

for autoplay of the video just add 

autoplay="autoplay"

to the initial

<video>

tag

for best results make sure you convert the videos to "H.264 + MP3" (MP4) before uploading

The endresult should look like this:

To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video