Chromecast 无法播放已保存的视频

Posted 2023-03-07

【中文标题】Chromecast 无法播放已保存的视频

【英文标题】：Chrome Cast won't play served video

【发布时间】：2014-06-27 16:23:28

【问题描述】：

好的，我正在为 ios 上的 chrome cast 开发一个应用程序。我的应用程序将执行的功能之一是从您的​​设备播放本地视频。为此，我使用了在 github 上找到的一个名为 CocoaHttpServer. 的外部源。这个 Http 服务器允许我将文件上传到 localhost 服务。为此，我使用以下代码启动我的服务器：

- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
        // Configure our logging framework.
    // To keep things simple and fast, we're just going to log to the Xcode console.
    [DDLog addLogger:[DDTTYLogger sharedInstance]];

    // Create server using our custom MyHTTPServer class
    httpServer = [[HTTPServer alloc] init];


    // Tell the server to broadcast its presence via Bonjour.
    // This allows browsers such as Safari to automatically discover our service.
    [httpServer setType:@"_http._tcp."];

    // Normally there's no need to run our server on any specific port.
    // Technologies like Bonjour allow clients to dynamically discover the server's port at runtime.
    // However, for easy testing you may want force a certain port so you can just hit the refresh button.
    // [httpServer setPort:12345];

    // Serve files from our embedded Web folder
    NSString *webPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Web"];
    DDLogInfo(@"Setting document root: %@", webPath);

    [httpServer setDocumentRoot:webPath];
    [self startServer];

    gblvb = [GlobalVariables singleobj];

    self.mediaControlChannel = [[GCKMediaControlChannel alloc] init];
    self.mediaControlChannel.delegate = self;
    [gblvb.deviceManager addChannel:self.mediaControlChannel];
    [self.mediaControlChannel requestStatus];

然后此代码设置我的 http 服务器并将其指向导入到我的主包中的 web 文件夹并包含我从谷歌下载用于测试目的的测试视频（谷歌在他们的流式传输示例中使用此视频通过网络投射的铬）。我从http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4 得到这个视频。除此之外，代码还设置了一个新的媒体通道，准备好让 chrome cast 投射到...

接下来我有我的 void 函数 startServer，它真正建立连接并发布服务器......

- (void)startServer

    // Start the server (and check for problems)

    NSError *error;
    if([httpServer start:&error])
    
        DDLogInfo(@"Started HTTP Server on port %hu", [httpServer listeningPort]);

    
    else
    
        DDLogError(@"Error starting HTTP Server: %@", error);
    

最后，下面的代码将路径设置为与 localhost url 相同，并将视频投射到 chrome cast：

-(void)viewDidAppear:(BOOL)animated

path = [NSString stringWithFormat:@"localhost:%hu%@%@", [httpServer listeningPort], @"/", @"BigBuckBunny.mp4"];


    // Do any additional setup after loading the view from its nib.

    gblvb = [ GlobalVariables singleobj];


    deviceScanner = [[GCKDeviceScanner alloc] init];


    [deviceScanner addListener:self];
    [deviceScanner startScan];
    NSString *image;
    NSString *type;
    GCKMediaMetadata *metadata = [[GCKMediaMetadata alloc] init];


        image = @"Folder-Video-icon.png";

        [metadata setString:@"The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions."
                     forKey:kGCKMetadataKeySubtitle];
        type = @"video/mp4";
[metadata setString:[NSString stringWithFormat:@"%@%@", @"Casting " , gblvb.FileType]forKey:kGCKMetadataKeyTitle];



    [metadata addImage:[[GCKImage alloc]
                        initWithURL:[[NSURL alloc] initWithString:image]
                        width:480
                        height:360]];

    //define Media information
    sleep(2);
    GCKMediaInformation *mediaInformation =
    [[GCKMediaInformation alloc] initWithContentID:path
                                        streamType:GCKMediaStreamTypeNone
                                       contentType:type
                                          metadata:metadata
                                    streamDuration:0
                                        customData:nil];

    //cast video
    [_mediaControlChannel loadMedia:mediaInformation autoplay:TRUE playPosition:0];
    NSLog(@"Full Path : %@", path);

现在我的问题是，当此 http 服务器已发布并准备投射时，即使当我实际导航到 safari 上的路径时，chrome cast 也不会播放它，视频显示完美。除此之外，我知道 chrome cast 可以正常播放，因为它可以播放 google 的在线示例视频。

编辑 这是我的调试日志，来自 chrome cast：

Failed to load resource: the server responded with a status of 404 (Not Found) https://www.gstatic.com/eureka/player/undefined
 [  0.259s] [goog.net.WebSocket] Opening the WebSocket on ws://localhost:8008/v2/ipc
 cast_receiver.js:18
 [  0.580s] [goog.net.WebSocket] WebSocket opened on ws://localhost:8008/v2/ipc
 cast_receiver.js:18
GET https://www.gstatic.com/eureka/player/Folder-Video-icon.png 404 (Not Found) player.js:31
The page at 'https://www.gstatic.com/eureka/player/player.html?skin' was loaded over HTTPS, but displayed insecure content from 'http://localhost:49598/BigBuckBunny.mp4': this content should also be loaded over HTTPS.
 cast_receiver.js:69
GET http://localhost:49598/BigBuckBunny.mp4  cast_receiver.js:69
 [ 21.834s] [cast.receiver.MediaManager] Load metadata error
 cast_receiver.js:18
GET https://www.gstatic.com/eureka/player/Folder-Video-icon.png 404 (Not Found) 

任何帮助将不胜感激。

【问题讨论】：

接收者日志说什么？

@Leon Nicholls Nicholls 我已将日志添加到我的问题中作为编辑。

【参考方案1】：

我解决了这个问题，而不是在模拟器上使用 localhost 进行测试，而是编写了一个函数来获取当前设备 IP 地址以及 localhost 部分在这一行中的位置path = [NSString stringWithFormat:@"localhost:%hu%@%@", [httpServer listeningPort], @"/", @"BigBuckBunny.mp4"]; 将其替换为设备 IP 地址。