It seems like the Apple Products (Safari, Ipad, Iphone) have problem to play masked URLs of videos:
<video id="jp_video_0" preload="metadata" style="width: 640px; height: 320px;" src="http://myelgginstallation/file/download/82/myvideo.m4v" title="Video M4V Format"></video>

Even a Chrombrowser on an Ipad got the same problem...

If I change the source to anf file outside my elgg system it works perfectly.

Do anyone encountered this problem befor and maybe found a solution?

Kind regards
Markus