How to play mp4 video in HoloLens?

One thing what is working for small animations is simple to have a 3dImage and to chage the pictures source via a timer event. For small animations it seems to work

So now we can write a script 

/////////////////////////////////////////////////////////////////////////////
var global_count_int1=0;
//----- HERE IS THE ANIMATION from Server
$interval( function(){
 
if(animate ==true) // this variable is true then animate
 {
 if( global_count_int1 > 7) global_count_int1=0;
 global_count_int1++;
 
 var url_source= "app/resources/Uploaded/pic_0"+global_count_int1+".gif";
 
 $scope.$applyAsync(function() {
 //$scope.view.wdg['3DImage-3']['source'] =url_source;
 $scope.app.params['image_url']=url_source;
 console.log("in interval url_source="+url_source);
 }
 ); //end applyAsync
 }
} , 500);
/////////////////////////////////////////////////////////////////////

So this script work if the variable animate== true (could be also some value of toggle button)

In this case the script will change every half second the picture displayed on the 3DImage element.

In my test it does not work directly to set the source so I used a workaround to set a parameter which is bound on the 3d image source property