使用AVPlayer播放视频

Question

我正在从视频文件中逐个获取帧缓冲AVAssetReader,并对帧进行一些操作,然后使用AVAssetWritter.将新帧保存到临时文件.现在我有临时文件路径,其中所有新帧都是逐个保存的.有没有什么方法可以在时间帧播放视频时不断添加到临时文件？

这里是从临时路径播放视频的代码(帧不断添加)

- (void)loadAssetFromFile {

    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[(mMediaReader.mCameraRecorder) tempVideoFilePath ]] options:nil];
    NSString *tracksKey = @"tracks";

    [asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:
     ^{

         // Completion handler block.
         dispatch_async(dispatch_get_main_queue(),
                        ^{
                            NSError *error = nil;
                            AVKeyValueStatus status = [asset statusOfValueForKey:tracksKey error:&error];

                            if (status == AVKeyValueStatusLoaded) {
                                self.mPlayerItem = [AVPlayerItem playerItemWithAsset:asset];
                                [mPlayerItem addObserver:self forKeyPath:@"status"
                                                options:0 context:&ItemStatusContext];
                                [[NSNotificationCenter defaultCenter] addObserver:self
                                                                         selector:@selector(playerItemDidReachEnd:)
                                                                             name:AVPlayerItemDidPlayToEndTimeNotification
                                                                           object:mPlayerItem];
                               self.mPlayer = [AVPlayer playerWithPlayerItem:mPlayerItem];
                                [mPlayerView setPlayer:mPlayer];
                                [self play:nil];
                            }
                            else {
                                // You should deal with the error appropriately.
                                NSLog(@"The asset's tracks were not loaded:\n%@", [error localizedDescription]);
                            }
                        });
     }];
}

- (IBAction)play:sender {
    [mPlayer play];
}

并且块内的代码永远不会运行.

Answer 1

将视频分成多个子视频对我有用。

我所做的不是将完整视频保存在一个临时路径中。我将该视频分成多个子视频，然后相应地替换AVPlayerItem其属性AVPlayer。

所以现在功能的工作方式与视频流相同。:)