建議換一下方式，親測有效

AVPlayerItem *item = [AVPlayerItemplayerItemWithURL:[[NSBundlemainBundle] URLForResource:@"q1111.mp4"withExtension:nil]];

// 3.建立AVPlayer

_player = [AVPlayerplayerWithPlayerItem:item];

// 4.新增AVPlayerLayer

AVPlayerLayer *playerLayer = [AVPlayerLayerplayerLayerWithPlayer:_player];

playerLayer.frame

playerLayer.videoGravity =AVLayerVideoGravityResizeAspectFill;

[self.view.layeraddSublayer:playerLayer];

[_player play];