音视频技术（3）- 入门DEMO

公号sumsmile

发布于 2020-03-27 12:28:03

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发布于 2020-03-27 12:28:03

文章被收录于专栏：音视频技术学习笔记

断断续续花了一周的业余时间，完成了4个iOS端 ffmpeg demo的实现

做个简单的入口

image

接入ffmpeg编译好的库和头文件，打印configuration

image

推流的实现推流的实现，需要先搭建一个nginx + rtmp服务器，也不复杂，网上有很多详细的教程推流后，本地可以用ffplay来查看推流的视频，也可以写个简单的h5页面查看推流最末尾会报错，错误如下，google/baidu 找遍了所有的帖子，没找到原因 // av_write_trailer(ofmt_ctx); 只能确定是这句代码有问题，应该是写流结尾出bug了，可能是采用了老接口的问题 Error muxing packet [flv @ 0x12102c000] Failed to update header with correct duration. [flv @ 0x12102c000] Failed to update header with correct filesize. Error occurred.

也可以直接用ffmpeg命令推流

ffmpeg -re -i "/home/users/test.mp4" -vcodec libx264 -vprofile baseline -acodec aac -ar 44100 -strict -2 -ac 1 -f flv -s 1280x720 -q 10 rtmp://xxxxx:1935/hls/test2

// 直接用ffplay接受流媒体数据
// ffplay -i rtmp://180.76.164.113:1935/hls/test2

// h5实现代码, 引用了hls库：
 <!DOCTYPE html>
<html>
<head>
    <title>rtmp</title>
    <meta charset="utf-8">
    <script src="https://cdn.jsdelivr.net/hls.js/latest/hls.min.js"></script>
</head>
<body>
    非的发达
    <video 
    autoplay="true"
    muted="muted"
    id="video"></video>
    <script>
        if (Hls.isSupported()) {
            var video = document.getElementById('video');
            var hls = new Hls();
            hls.loadSource('http://xxxxx/hls/test2.m3u8');
            hls.attachMedia(video);
            hls.on(Hls.Events.MANIFEST_PARSED, function(){
                video.play();
            })
        }  
    </script>
</body>
</html>

iOS原生播放器的实现

image.png iOS对音视频的支持非常好，写个播放的demo，总共不到80行代码

#import "PlayViewController.h"
#import <MediaPlayer/MediaPlayer.h>
@interface PlayViewController ()
@property MPMoviePlayerController *moviePlayer;
@end

@implementation PlayViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.moviePlayer play];
}

-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

-(MPMoviePlayerController *)moviePlayer{
    if(!_moviePlayer){
        NSString *urlStr = [[[NSBundle mainBundle]resourcePath] stringByAppendingPathComponent:@"resource.bundle/war3end.mp4"];
        NSURL *url = [NSURL fileURLWithPath:urlStr];
        _moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
        _moviePlayer.view.frame = self.view.bounds;
        _moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
        [self.view addSubview:_moviePlayer.view];
    }
    return _moviePlayer;
}

-(void)addNotification{
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    [notificationCenter addObserver:self selector:@selector(mediaPlayerPlaybackStateChange:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:self.moviePlayer];
    [notificationCenter addObserver:self selector:@selector(mediaPlayerPlaybackfinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:self.moviePlayer];
}

-(void)mediaPlayerPlaybackStateChange:(NSNotification *)notification{
    switch (self.moviePlayer.playbackState) {
        case MPMoviePlaybackStatePlaying:
            NSLog(@"正在播放...");
            break;
        case MPMoviePlaybackStatePaused:
            NSLog(@"暂停播放");
            break;
        case MPMoviePlaybackStateStopped:
            NSLog(@"停止播放");
            break;
        default:
            break;
    }
}

-(void)mediaPlayerPlaybackfinished:(NSNotification *)notification{
    NSLog(@"播放完成.%li", self.moviePlayer.playbackState);
}

@end

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