I spent a few minutes and fixed it for you.  Plunkr: 
http://plnkr.co/edit/LyhSB7Iu64zdAHIsFQsP?p=preview

The solution is to first remove the getThumbnailURL(video) from with the 
ng-repeat which is creating an async clash.

Then simply move that code to your controller's add().  Within the add() 
get your thumbnail using $http and upon success THEN update the videos 
array (which will then trigger the ng-repeat). The ng-repeat will now 
traverse a simple array no longer making clashing $http/async calls.

NOTE: To reiterate, the key here is to push the video object to your array 
AFTER the async $http completes.

Mo

On Friday, May 29, 2015 at 1:19:23 PM UTC-4, Aimery Marsily wrote:
>
> I get one thumbnail per video, but there are many videos. So the ng-repeat 
> is to display each videos with one thumbnail.
>

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