音视频播放是iOS开发常用的功能，在这里做一个简单的总结：
音频简单来分为短音频（音效）、长音频（音乐）

（1）简单音效的播放：<AVFoundation>

// 1.获得音效文件的路径
NSURL *url = [[NSBundle mainBundle] URLForResource:@"m_03.wav" withExtension:nil];
// 2.加载音效文件，得到对应的音效ID
SystemSoundID soundID = 0;
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &soundID);
// 3.播放音效 不带震动
AudioServicesPlaySystemSound(soundID);
//播放时带有震动
//AudioServicesPlayAlertSound(soundID)

（2）音乐播放：AVAudioPlayer(只能用来播放本地音乐)< AVFoundation>

- (IBAction)startMusic:(id)sender {
[self.player play];
//    [self playMusicWithFileName:@"music_a.mp3"];
}
- (IBAction)suspendMusic:(id)sender {
[self.player pause];
//    [self pauseMusicWithFileName:@"music_a.mp3"];
}
- (IBAction)stopMusic:(id)sender {
[self.player stop];
self.player  = nil;
//    [self stopMusicWithFileName:@"music_a.mp3"];

}
#pragma mark - 懒加载
- (AVAudioPlayer *)player
{
if (_player == nil) {
    // 1.创建音乐文件
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"music_a.mp3" withExtension:nil];
    // 2.创建播放器
    _player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    // 3.准备播放
    [_player prepareToPlay];
}
return _player;
}

（3）播放本地音乐、网络音乐、本地视频、网络视频AVPlayer < AVFoundation>

- (AVPlayer *)player
{
if (_player == nil) {
 //方法一
 // 1.加载视频资源
 //本地
//NSURL *localUrl = [[NSBundle mainBundle]     URLForResource:@"music_a.mp3" withExtension:nil]; 
 NSURL *localUrl = [[NSBundle mainBundle]     URLForResource:@"testVideo.mp4" withExtension:nil];
 //网络
NSURL *networkUrl = [NSURL URLWithString:@""];
  // 2.创建播放器
 AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:localUrl];
  _player = [AVPlayer playerWithPlayerItem:playerItem];
// 3.创建AVPlayerLayer  音频不需要  视频需要
AVPlayerLayer *playerLayer = [AVPlayerLayer     playerLayerWithPlayer:_player];

playerLayer.frame = CGRectMake(0, 100, self.view.bounds.size.width,   self.view.bounds.size.width * 9 / 16);
 [self.view.layer addSublayer:playerLayer];
}
    return _player;
}

//调用播放方法
[self.player play];

（4）.视频播放还有其他方法

（1）.MPMoviePlayerController<MediaPlayer/MediaPlayer.h> (可以调节全屏状态和非全屏状态) (iOS9.0后废弃)

- (void)mpMoviePlayerControllerTest
{
NSURL*url=[NSURL URLWithString:@"http://v4ttyey-10001453.video.myqcloud.com/Microblog/288-4-1452304375video1466172731.mp4"];
NSURL *localUrl = [[NSBundle mainBundle] URLForResource:@"testVideo.mp4" withExtension:nil];
MPMoviePlayerController *mpMoviePlayerVC = [[MPMoviePlayerController alloc]initWithContentURL:url];
mpMoviePlayerVC.view.frame = CGRectMake(0, 100, self.view.bounds.size.width, self.view.bounds.size.width * 9 / 16);
[self.view addSubview:mpMoviePlayerVC.view];
}

（2） MPMoviePlayerViewController<MediaPlayer/MediaPlayer.h> (以modal的样式弹出来,只能全屏显示) (iOS9.0后废弃)

- (void)mpMoviePlayerViewControllerTest
{
NSURL*url=[NSURL URLWithString:@"http://v4ttyey-10001453.video.myqcloud.com/Microblog/288-4-1452304375video1466172731.mp4"];
//NSURL *localUrl = [[NSBundle mainBundle] URLForResource:@"testVideo.mp4" withExtension:nil];
 MPMoviePlayerViewController *playerViewVC =       [[MPMoviePlayerViewController alloc]initWithContentURL:url];
   [self presentViewController:playerViewVC animated:YES completion:nil];
}

（3）AVPlayerViewController(以modal的样式弹出来,只能全屏显示)<AVKit>

//此处传入的player就是AVPlayer格式的
 AVPlayerViewController *avplayerVC = [[AVPlayerViewController alloc]init];
    avplayerVC.player = _player;
    [self presentViewController:avplayerVC animated:YES completion:nil];

所有格式都支持的框架VLC 、ffmpeg 、kxMovie

上面的demo地址 https://github.com/hangxing0215/SHAVDemo