在iOS中處理視訊播放一般可以使用MPMoviePlayerViewController或者AVPlayer

一、MPMoviePlayerViewController的使用

MPMoviePlayerViewController是系統封裝的一個播放器控制器，其中對於視訊的控制由其屬性@property (nonatomic, readonly) MPMoviePlayerController *moviePlayer;負責。

1.建立使用

NSURL *URL = [NSURL fileURLWithPath:_videoPath];
        _player = [[MPMoviePlayerViewController alloc] initWithContentURL:URL];
 

        _player.moviePlayer.controlStyle = MPMovieControlStyleNone;//不顯示控制控制元件
        _player.moviePlayer.repeatMode = MPMovieRepeatModeNone;//不迴圈播放
        _player.moviePlayer.scalingMode =MPMovieScalingModeAspectFill;//儲存寬高比，填滿檢視
        [_player.moviePlayer prepareToPlay];
        [_player.moviePlayer
 
 play];播放

若要將播放器檢視加到某個view上，要這樣寫

[self.view addSubview:_player.view];

2.播放狀態的監控處理

有時候，播放器開始播放的時候，會有一點黑屏的緩衝載入時間，感覺上會先黑屏一下才出現視訊，為了視訊載入的時候不顯示黑屏，一般可先覆蓋一張圖片（比如視訊第一幀），等待視訊載入完成才隱藏圖片播放視訊。這種場景下便需要監聽播放器的通知了。

MPMoviePlayerViewController的狀態監控可通過moviePlayer的發出的通知來接收。下面介紹下常用到的。

a.狀態改變

[self addObserver:
 
@selector(loadStatusChanged:) name:MPMoviePlayerLoadStateDidChangeNotification object:nil];

- (void)loadStatusChanged:(NSNotification *)notification {
    MPMoviePlayerController *player = notification.object;
    if ([player isEqual: _player.moviePlayer] && (player.loadState & MPMovieLoadStatePlayable)) {
        [player play];//現在才播放
        [_coverView removeFromSuperview];//移除遮蓋圖片
    }
}

b.視訊播放結束（失敗）

[self addObserver:@selector(playDidFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];

- (void)playDidFinished:(NSNotification *)notification {
    MPMoviePlayerController *player = notification.object;
    if (![player isEqual:_player.moviePlayer]) {
        return;
    }
    NSDictionary *notificationUserInfo = [notification userInfo];
    NSNumber *resultValue = [notificationUserInfo objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
    MPMovieFinishReason reason = [resultValue intValue];
    if (reason == MPMovieFinishReasonPlaybackError)
    {
        NSError *mediaPlayerError = [notificationUserInfo objectForKey:@"error"];
        if (mediaPlayerError) {
            GLLoge(@"動畫播放失敗: %@", [mediaPlayerError localizedDescription]);
        } else {
            GLLoge(@"動畫播放出錯了");
        }
    }
}

注意：

不可以同時載入播放兩個以上的MPMoviePlayerViewController，多個播放器最終只有一個播放能生效，通知也只能收到一個播放器發出的。

二，AVPlayer的使用

AVPlayer相對於MPMoviePlayerViewController更為底層，功能更強大。

需要引入庫#import <AVFoundation/AVFoundation.h>

1.建立使用

@property (nonatomic)AVPlayer *player;
@property (nonatomic)AVPlayerItem *playerItem;

_playerItem=[AVPlayerItem playerItemWithURL:[[NSBundle mainBundle] URLForResource:@"launch" withExtension:@"mp4"]]; //建立播放源物件

_player=[AVPlayer playerWithPlayerItem:self.playerItem];//播放器物件

AVPlayerLayer *layer=[AVPlayerLayer playerLayerWithPlayer:self.player];
    layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
    layer.frame=[UIScreen mainScreen].bounds;
    layer.backgroundColor=[[UIColor whiteColor] CGColor];
    [self.layer addSublayer:layer];//必須使用AVPlayerLayer加到view的layer中，否則看不到視訊

[_player play];

2.AVPlayer的狀態監控

AVPlayer是沒有迴圈播放模式的，但可以通過狀態監控，在視訊播放完後，從頭再播放。它的播放控制和各種狀態是通過其播放源AVPlayerItem來監控的。

a.播放完成監控（可實現迴圈播放）

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(runLoopTheMovie:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

- (void)runLoopTheMovie:(NSNotification *)notification{
    //註冊的通知  可以自動把 AVPlayerItem 物件傳過來，只要接收一下就OK

    AVPlayerItem * playItem = [notification object];
    //關鍵程式碼
    [playItem seekToTime:kCMTimeZero];//時間撥到0，重新開始

    [_player play];
}

b.狀態改變和緩衝進度，可處理遮蓋圖片避免閃黑屏以及載入進度的顯示

[self.playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];// 監聽status屬性
 [self.playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];// 監聽loadedTimeRanges 緩衝屬性

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{

    AVPlayerItem *playerItem = (AVPlayerItem *)object;
    if ([keyPath isEqualToString:@"status"]) {
        if ([playerItem status] == AVPlayerStatusReadyToPlay) {
            NSLog(@"AVPlayerStatusReadyToPlay");

            //隱藏遮蓋圖片
            [UIView animateWithDuration:0.3 animations:^{
                self.coverImageView.alpha=0;
            } completion:^(BOOL finish){
                if (finish) {
                    self.coverImageView.hidden=YES;
                }

            }];

        } else if ([playerItem status] == AVPlayerStatusFailed) {
            GLLoge(@"動畫播放失敗");

        }
    }

    else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
     NSTimeInterval timeInterval = [self availableDuration];// 計算緩衝進度
     NSLog(@"Time Interval:%f",timeInterval);
     CMTime duration = self.playerItem.duration;
     CGFloat totalDuration = CMTimeGetSeconds(duration);
     [self.videoProgress setProgress:timeInterval / totalDuration animated:YES];
     }
}

- (NSTimeInterval)availableDuration {
    NSArray *loadedTimeRanges = [[self.playerView.player currentItem] loadedTimeRanges];
    CMTimeRange timeRange = [loadedTimeRanges.firstObject CMTimeRangeValue];// 獲取緩衝區域
    float startSeconds = CMTimeGetSeconds(timeRange.start);
    float durationSeconds = CMTimeGetSeconds(timeRange.duration);
    NSTimeInterval result = startSeconds + durationSeconds;// 計算緩衝總進度
    return result;
}

- (NSString *)convertTime:(CGFloat)second{
    NSDate *d = [NSDate dateWithTimeIntervalSince1970:second];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    if (second/3600 >= 1) {
        [formatter setDateFormat:@"HH:mm:ss"];
    } else {
        [formatter setDateFormat:@"mm:ss"];
    }
    NSString *showtimeNew = [formatter stringFromDate:d];
    return showtimeNew;
}

這裡附上取視訊第一幀的程式碼：

//獲取視訊第一幀影象
- (UIImage*)getCoverImage{

    AVURLAsset *asset = [AVURLAsset assetWithURL:[[NSBundle mainBundle] URLForResource:@"launch" withExtension:@"mp4"]];

    NSParameterAssert(asset);

    AVAssetImageGenerator *assetImageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];

    assetImageGenerator.appliesPreferredTrackTransform =YES;

    assetImageGenerator.apertureMode =AVAssetImageGeneratorApertureModeEncodedPixels;

    CGImageRef thumbnailImageRef = NULL;

    NSError *thumbnailImageGenerationError = nil;

    CMTime time = CMTimeMakeWithSeconds(0.0, 600);

    thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:time actualTime:NULL error:&thumbnailImageGenerationError];

    if (!thumbnailImageRef)
        NSLog(@"thumbnailImageGenerationError %@", thumbnailImageGenerationError);



    UIImage *thumbnailImage = thumbnailImageRef ? [[UIImage alloc] initWithCGImage:thumbnailImageRef] :nil;

    CGImageRelease(thumbnailImageRef);

    return thumbnailImage;

}