使用AVPlayer在AVCaptureMovieFileOutput录制后播放视频

Question

我使用AVFoundation创建了一个类似于Snapchat的自定义相机。拍照方面已经实现：拍照后我会显示图片。现在我正在尝试录制视频并播放它。

我已经成功地捕获了一个视频文件，并通过MPMoviePlayer进行了测试，但无法在AVPlayer上播放它。

- (void)takeVideoAction:(id)sender {
    NSString *outputPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"output.mp4"];

    NSFileManager *manager = [[NSFileManager alloc] init];
    if ([manager fileExistsAtPath:outputPath]){
        [manager removeItemAtPath:outputPath error:nil];
    }
   [movieFileOutput startRecordingToOutputFileURL:[NSURL fileURLWithPath:outputPath] recordingDelegate:self];
}

---

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{


            AVURLAsset *asset = [AVURLAsset URLAssetWithURL:outputFileURL options:nil];
            [asset loadValuesAsynchronouslyForKeys:@[@"tracks"] completionHandler:^{
            dispatch_async(dispatch_get_main_queue(), ^{
                 NSError *error = nil;
                 if([asset statusOfValueForKey:@"tracks" error:&error] == AVKeyValueStatusFailed){
                    NSLog(@"error: %@", [error description]);
                }
                else{
                    self.playerItem = [AVPlayerItem playerItemWithAsset:asset];
                    self.player = [AVPlayer playerWithPlayerItem:self.playerItem];
                    self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
                    self.playerLayer.frame = self.view.bounds;
                    [self.view.layer addSublayer:self.playerLayer];

                    [self.player play];
                }
            });
        }];
    }

这是我第一次使用AVFoundation和AVPlayer。是这样的，我在资产加载后不能立即使用[self.player play]吗？我需要等待项目状态为AVPlayerItemStatusReadyToPlay吗？

---

错误：错误域=NSURLErrorDomain代码=-1100"服务器上未找到请求的URL。"

- Peter

Answer 1

我正在使用AVPlayerLayer播放视频。我使用了以下代码，它可以正常工作。

AVPlayer *avPlayerq = [AVPlayer playerWithURL:NSURL];
avPlayerq.actionAtItemEnd = AVPlayerActionAtItemEndNone;
AVPlayerLayer *videoLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayerq];
videoLayer.frame= self.view.bounds;
videoLayer.videoGravity=AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:videoLayer];
[avPlayerq play];

希望这能帮到你。

- Forte Zhu