iphone – rtsp：//带有AVPlayer的liveStream

2023年11月28日 255次阅读

我想用AVPlayer在iPhoneDevice上播放liveStream.此外,我想从此流中获取CVPixelBufferRef以供下次使用.

我使用Apple guide创建播放器.目前使用本地存储的videoFiles,这个播放器工作正常,当我尝试播放这个AppleSampleStremURL时 – http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8 – 它的工作正常.

当我想使用rtsp：//播放流时会出现问题：rtsp：//192.192.168.1：8227 / TTLS / Streaming / channels / 2？videoCodecType = H.264

一个代码 – 几乎所有使用Apple提供的guid完成,但无论如何：

准备资产进行游戏

- (void)initialSetupWithURL:(NSURL *)url
{
    NSDictionary *assetOptions = @{ AVURLAssetPreferPreciseDurationAndTimingKey : @YES,
                                    AVURLAssetReferenceRestrictionsKey : @(AVAssetReferenceRestrictionForbidNone)};
    self.urlAsset = [AVURLAsset URLAssetWithURL:url options:assetOptions];
}

准备球员

- (void)prepareToPlay
{
    NSArray *keys = @[@"tracks"];
    __weak SPHVideoPlayer *weakSelf = self;
    [weakSelf.urlAsset loadValuesAsynchronouslyForKeys:keys completionHandler:^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf startLoading];
        });
    }];
}

- (void)startLoading
{
    NSError *error;
    AVKeyValueStatus status = [self.urlAsset statusOfValueForKey:@"tracks" error:&error];
    if (status == AVKeyValueStatusLoaded) {
        self.assetDuration = CMTimeGetSeconds(self.urlAsset.duration);
        NSDictionary* videoOutputOptions = @{ (id)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange)};
        self.videoOutput = [[AVPlayerItemVideoOutput alloc] initWithPixelBufferAttributes:videoOutputOptions];
        self.playerItem = [AVPlayerItem playerItemWithAsset: self.urlAsset];

        [self.playerItem addObserver:self
                          forKeyPath:@"status"
                             options:NSKeyValueObservingOptionInitial
                             context:&ItemStatusContext];
        [self.playerItem addObserver:self
                          forKeyPath:@"loadedTimeRanges"
                             options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld
                             context:&ItemStatusContext];
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(playerItemDidReachEnd:)
                                                     name:AVPlayerItemDidPlayToEndTimeNotification
                                                   object:self.playerItem];
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(didFailedToPlayToEnd)
                                                     name:AVPlayerItemFailedToPlayToEndTimeNotification
                                                   object:nil];

        [self.playerItem addOutput:self.videoOutput];

        self.assetPlayer = [AVPlayer playerWithPlayerItem:self.playerItem];

        [self addPeriodicalObserver];
        NSLog(@"Player created");
    } else {
        NSLog(@"The asset's tracks were not loaded:\n%@", error.localizedDescription);
    }
}

这里出现问题 – AVKeyValueStatus status = [self.urlAsset statusOfValueForKey：@“track”error：& error]; – 这行与rtsp：// URL返回AVKeyValueStatusFailed

有错误：

Printing description of error:
Error Domain=AVFoundationErrorDomain Code=-11800 
"The operation could not be completed" 
UserInfo=0x7fd1ea5a8a10 {NSLocalizedFailureReason=An unknown error occurred (-12936), 
NSLocalizedDescription=The operation could not be completed,
NSURL=rtsp://192.168.1.168:8556/PSIA/Streaming/channels/2?videoCodecType=H.264,
NSUnderlyingError=0x7fd1ea53f830 "The operation couldn’t be completed.
(OSStatus error -12936.)"}

我也在寻找问题：

> FirstOne – 尝试使用来自Apple – StitchedStreamPlayer的这个流示例应用程序 – 但是对于我想在那里播放的流获得几个不同的错误
> SecondOne – 尝试同时使用这两个建议 – fileURLWithPath返回错误的URL,如：rtsp：//192.168.1.168：8556 / PSIA / Streaming / channels / 2？videoCodecType = H.264 –file：/// – 所以我猜不正确
>根据AppleDev尝试使用diff方法创建AvPlayer：如[AVPlayer playerWithPlayerItem：playerItem]和[AVPlayer playerWithURL：url] – 没有任何改变.还尝试为AVAsset设置不同的设置 – 在initialSetupWithURL中(参见上面的方法实现).

那么,问题是AVPlayer支持播放rtsp：// stream？
如果是,有人可以提供正确使用的样本吗？ Nad我在代码中做错了什么？
如果AvPlayer不支持rtsp：//可能存在一些替代解决方案？

最佳答案 我没有找到如何通过AVURLAsset进行rtsp流的方法,但可以找到良好的起点
here.也许它对someOne有用

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