IOS AVPlayer 不会播放视频
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IOS AVPlayer won't play video
提问by Ashraf Hussein
I'm trying to play a video usingso I got some code from a tutorial but it won't work.
我正在尝试使用播放视频，所以我从教程中获得了一些代码，但它不起作用。
Here's the code I use :
这是我使用的代码：
- (void) viewDidAppear:(BOOL)animated
{
avAsset = [AVAsset assetWithURL:[NSURL URLWithString:filePath]];
avPlayerItem =[avPlayerItem initWithAsset:avAsset];
avPlayer = [AVPlayer playerWithPlayerItem:avPlayerItem];
avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
[avPlayerLayer setFrame:self.view.frame];
[self.view.layer addSublayer:avPlayerLayer];
[avPlayer seekToTime:kCMTimeZero];
[avPlayer play];
}
I don't know what's wrong it doesn't give ny errors it just gives black screen. Thanks.
我不知道出了什么问题，它没有给出任何错误，只是给出了黑屏。谢谢。
回答by Ashraf Hussein
Thanks s1mon and matt for your help.
感谢 s1mon 和 matt 的帮助。
Here's the new code it might help someone:
这是可能对某人有所帮助的新代码：
- (void) viewDidAppear:(BOOL)animated
{
avAsset = [AVAsset assetWithURL:[NSURL fileURLWithPath:filePath]];
avPlayerItem =[[AVPlayerItem alloc]initWithAsset:avAsset];
avPlayer = [[AVPlayer alloc]initWithPlayerItem:avPlayerItem];
avPlayerLayer =[AVPlayerLayer playerLayerWithPlayer:avPlayer];
[avPlayerLayer setFrame:self.view.frame];
[self.view.layer addSublayer:avPlayerLayer];
//[avPlayerLayer setBackgroundColor:[[UIColor redColor]CGColor]];
[avPlayer seekToTime:kCMTimeZero];
[avPlayer play];
}
Thank you.
谢谢你。
回答by matt
This might not be the actual problem, but this code is certainly wrong:
这可能不是实际问题，但这段代码肯定是错误的：
[NSURL URLWithString:filePath]
First of all, try not to start with a file path; start with a file URL. That way, there is no conversion needed. But if you mustperform a conversion from a file path to a URL, use fileURLWithPath:isDirectory:. A file URL is a special kind of animal and you must ask for one specifically when you are converting from a path.
首先，尽量不要以文件路径开头；以文件 URL 开头。这样，就不需要转换。但是，如果您必须执行从文件路径到 URL 的转换，请使用fileURLWithPath:isDirectory:. 文件 URL 是一种特殊的动物，当您从路径转换时，您必须特别要求一个。
回答by s1m0n
I think you forgot to create an instance of AVPlayerItemin this line:
我想你忘了AVPlayerItem在这一行中创建一个实例：
avPlayerItem =[avPlayerItem initWithAsset:avAsset];
This just sends initWithAsset:to avPlayerItem(which is probably nil when this method is called). Try changing it to instantiate an new AVPlayerItemwhich you can then assign to avPlayerItem, like this:
这只是发送initWithAsset:到avPlayerItem（调用此方法时可能为零）。尝试更改它以实例化一个 new AVPlayerItem，然后您可以将其分配给avPlayerItem，如下所示：
avPlayerItem = [[AVPlayerItem alloc] initWithAsset:avAsset];
回答by kemicofa ghost
For those looking for a swift 2.0 version, here is what worked for me. Cheers.
对于那些寻找swift 2.0 version，这对我有用。干杯。
import Foundation
import UIKit
import AVKit
class VideoViewController: AVPlayerViewController {
override func viewDidAppear(animated: Bool) {
self.setupVideoPlayerView()
}
private func setupVideoPlayerView()
{
let path = "HTTP_VIDEO_URL_HERE"
let nsURL = NSURL(string: path)
let avAsset = AVAsset(URL: nsURL!)
let avPlayerItem = AVPlayerItem(asset: avAsset)
let avPlayer = AVPlayer(playerItem: avPlayerItem)
let avPlayerLayer = AVPlayerLayer(layer: avPlayer)
avPlayerLayer.frame = self.view.frame
self.view.layer.addSublayer(avPlayerLayer)
self.player = avPlayer
self.player!.seekToTime(kCMTimeZero)
self.player!.play()
}
}
