iOS AVPlayer 获取文件总时长的方法

1.    // 异步加载时长
   AVAsset *avsset = [AVAsset assetWithURL:[NSURL URLWithString:filePath]];
    self.player = [AVPlayer playerWithPlayerItem:[AVPlayerItem playerItemWithAsset:avsset]];
   
    [avsset loadValuesAsynchronouslyForKeys:@[@"duration"] completionHandler:^{
        dispatch_async(dispatch_get_main_queue(), ^{
            NSError *error = nil;
            AVKeyValueStatus status = [avsset statusOfValueForKey:@"duration" error:&error];
     
            if (status == AVKeyValueStatusLoaded) {
                CMTime duration = avsset.duration;
                Float64 seconds = duration.value /duration.timescale;
                
                NSLog(@"音频文件总时长: %.2f秒", seconds);                    
   
            } else {
                NSLog(@"无法加载音频文件的时长: %@", error.localizedDescription);
   
            }
        });
    }];
   

2.  self.timeObserve = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0)
                                                                 queue:dispatch_get_main_queue()
                                                            usingBlock:^(CMTime time) {
   
        if(weakSelf.player.currentItem.status == AVPlayerItemStatusReadyToPlay){
            
            NSLog(@"weakSelf.player.currentItem == %@",weakSelf.player.currentItem);
            
            CMTime duration = weakSelf.player.currentItem.duration; // 获取视频长度
            
            CGFloat totalTimes = duration.value / duration.timescale;
            
            NSLog(@"duration.value == %lld",duration.value);
            NSLog(@"duration.timescale == %d",duration.timescale);
            
            NSLog(@"totalTimes == %f",totalTimes);
            
        }
        
     }];
   

3.在以上两种方法都获取到的总时长都是0的时候，我让后台改回去了，因为之前我是可以获取到的，后来后台不知道改了什么，我搞了一晚上都获取不到这个总时长，于是我让他改回去了。