ios - AVPlayerLayer slow instantiation -

note : accept answer in xamarin.ios, objective-c or swift. if need reading xamarin code can clear you, should fine considering "complexity" of code here.

i suspect avplayerlayer slow down process.

i'm embedding video/audio player in controller of mine, using following code in viewdidload :

    void setuplayer()     {         _layer = avplayerlayer.fromplayer(_player);         _layer.frame = playerviewcontainer.bounds;         _layer.player = _player;         _layer.backgroundcolor = uicolor.black.cgcolor;         _layer.videogravity = avlayervideogravity.resizeaspect;          //this uiview         playerviewcontainer.layer.insertsublayer(_layer, 0);     } 

as this, in constructor of own controller (containing player) :

        public void seturls(string mediaurl, string coverurl = null)         {             coverurl = string.isnullorempty(coverurl) ? string.empty : coverurl;             mediaurl = mediaurl;              avurlasset asset = new avurlasset(new nsurl(mediaurl));             avplayeritem item = new avplayeritem(asset);              _isvideo = item.asset.tracks.length != 1;              _player = new avplayer(item);         } 

this relevant code called in viewdidload , constructor. parts removed should of no influence whatsoever (settings texts, loading assets , whatnot).

now issue i'm facing loading "big" (by big, don't mean more 4 hour video stream. 4 minutes long. ) file takes lot of time. 4 seconds. between 0.5-1.5 in constructor (seturls function), , between 1.5-2.5 in viewdidload (setuplayer function).

i've timed it, , removing methods drastically reduces lag decent (but have no image or bad results).

i've compared native player, using following code :

            _item = avplayeritem.fromurl(url);             _player = new avplayer(_item);              _controller = new avplayerviewcontroller();             _controller.player = _player;              this.presentviewcontroller(_controller, true, _player.play); 

and loads instantly. it's not 4 seconds of loading more evenly spread, it's takes less 4 seconds altogether.

considering it's loading during animation, , screen still black , not playing when player displayed, i'd native controller job in 1-2 seconds (while half of during animation).

mine before animating/showing anything. nice thing video plays can, no blackscreen. downside horrible loading time of controller.

note : during loading time, ui blocked. leads me believe it's happening on ui thread , that, maybe, shouldn't.

my questions :

• where bottlenecks here ? i'm doing wrong.
• what should differently? maybe way i'm loading player in own controller ?
• how can load components asynchronously avoid blocking ui thread? enough reduce loading time ? or simply, allowed it?

convert method async , call await asset.loadvaluestaskasync(new string[] { @"playable" }); after creating asset. preload video not block ui.