Question

我将“.mov”文件保存到带有数据的图像选取器控制器的托管Parse数据库中：

NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSData *data = [NSData dataWithContentsOfURL:videoURL];

我稍后检索该文件的NSData，并希望让用户使用MPMoviePlayerController播放视频。有没有办法在不编写文件的情况下执行此操作？我宁愿只在一个完成后释放的临时位置播放它......

这是我的代码，但是当视图显示时没有视频播放......

NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"temp.mov"];

[self.videoData writeToFile:outputPath atomically:YES];
NSURL *moveUrl = [NSURL fileURLWithPath:outputPath];
MPMoviePlayerController *player = [[MPMoviePlayerController alloc]initWithContentURL:moveUrl];
[player prepareToPlay];
[player.view setFrame:CGRectMake(40, 197, 240, 160)];
[self.view addSubview:player.view];
[player play];

Answer 1

首先，MPMoviePlayerController is deprecated in iOS9 如果您确实想要使用它（不推荐），则必须使用initWithContentURL:进行初始化在您的情况下，最佳目录可能是tmp目录，请参阅here。

Answer 2

在您的问题中，您首先获取数据，然后播放视频。您可以根据主机的带宽成本对其进行流式传输。

这是一个将视频播放器添加到UIView层的Swift技术，它在通知选择器中完成后循环。（如果你不想转换它，请检查如何将Swift与Objective-C一起使用）

导入AVFoundation

var videoPlayer: AVPlayer!
var isMoviePlaying: Bool = false

func playVideo(video: Video, autoplay: Bool)
{
     if !isMoviePlaying
        {
            isMoviePlaying = true
            var url:NSURL = NSURL(string: videoUrl)!

            startActivityIndicator()

            let playerItem = AVPlayerItem(URL: url)

            self.videoPlayer = AVPlayer.playerWithPlayerItem(playerItem) as! AVPlayer

            NSNotificationCenter.defaultCenter().addObserver(self, selector: "playerItemDidReachEnd:", name:"AVPlayerItemDidPlayToEndTimeNotification", object: videoPlayer.currentItem)

            let layer = AVPlayerLayer(player: self.videoPlayer)
            self.videoPlayer.actionAtItemEnd = .None

            layer.frame = CGRectMake(0, 0, self.frame.size.width * 0.95, self.frame.size.height * 0.85)
            layer.videoGravity = AVLayerVideoGravityResizeAspect
            self.videoView.layer.addSublayer(layer)

            stopActivityIndicator()

            self.videoPlayer.play()
        }
}


func playerItemDidReachEnd(notification: NSNotification)
{
    // loop the video
    if let playerItem: AVPlayerItem = notification.object as? AVPlayerItem
    {
        playerItem.seekToTime(kCMTimeZero)
    }
}

如何使用NSData从Web播放电影文件

2 个答案: