Google Cast Chromecast SDK消息格式错误（级别无 Value ）

我知道这个帖子与此重复，但没有答案 .

Receving weird Json Error from custom Chromecast recevier app

我正在尝试从Android应用程序转换为chromecast . 我按照Google的以下示例进行操作 .

https://developers.google.com/cast/docs/android_sender_integrate

https://developers.google.com/cast/docs/caf_receiver_basic

我可以成功连接到chromecast，它在电视上显示我的自定义html与应用程序名称 .

当我发送视频并且它说JSON没有卷的 Value 时出现错误 . 它显示图像的元数据，名称和描述，但它不播放它

public void playOnChromecast() {

    CastSession session =CastContext.getSharedInstance(this).getSessionManager().getCurrentCastSession();

    if(session == null) return;

    MediaMetadata movieMetadata = new MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE);

    movieMetadata.putString(MediaMetadata.KEY_TITLE, this.video.getName());
    movieMetadata.putString(MediaMetadata.KEY_SUBTITLE, this.video.getDescription());
    movieMetadata.addImage(new WebImage(Uri.parse(this.video.getThumbnail())));
    movieMetadata.addImage(new WebImage(Uri.parse(this.video.getThumbnail())));

    MediaLoadOptions.Builder mediaLoadOptionsBuilder = new MediaLoadOptions.Builder();
    mediaLoadOptionsBuilder.setAutoplay(true);
    mediaLoadOptionsBuilder.setPlayPosition(0);

    MediaTrack track = new MediaTrack.Builder(this.video.getId(), MediaTrack.TYPE_VIDEO)
            .setName(this.video.getName())
            .setSubtype(MediaTrack.SUBTYPE_NONE)
            .setContentId(String.valueOf(this.video.getId()))
            .setLanguage("es").build();

    ArrayList<MediaTrack> tracks = new ArrayList<MediaTrack>();
    tracks.add(track);

    JSONObject jsonObj = null;try {
        jsonObj = new JSONObject();
        jsonObj.put("description", this.video.getDescription());
    } catch (JSONException e) {
        e.printStackTrace();
    }

    MediaInfo mediaInfo = new MediaInfo.Builder("http://clips.vorwaerts-gmbh.de/VfE_html5.mp4")
            .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
            .setContentType("video/mp4")
            .setMetadata(movieMetadata)
            .setMediaTracks(tracks)
            .setCustomData(jsonObj)
            .build();

    RemoteMediaClient remoteMediaClient = session.getRemoteMediaClient();
    remoteMediaClient.load(mediaInfo, mediaLoadOptionsBuilder.build());
}

结果就是什么都没有 . 在控制台中，我收到以下消息 .

W / MediaControlChannel：消息格式错误（级别没有值）;忽略：（JSON）

作为（JSON）SDK发送给设备的一堆JSON数据 .

{"type":"MEDIA_STATUS","status":[{"mediaSessionId":1,"playbackRate":1,"playerState":"IDLE","supportedMediaCommands":15,"volume":{},"media":{"contentId":"http://clips.vorwaerts-gmbh.de/VfE_html5.mp4","streamType":"BUFFERED","contentType":"video/mp4","metadata":{"metadataType":1,"images":[{"url":"http://cachepicapica.gomovil.co/videos-transcoded/fd42e6b6-b1f8-4eee-87c9-9b024ea41f0b/thumbnail.jpg","width":0,"height":0},{"url":"http://cachepicapica.gomovil.co/videos-transcoded/fd42e6b6-b1f8-4eee-87c9-9b024ea41f0b/thumbnail.jpg","width":0,"height":0}],"title":"Susanita","subtitle":"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit"},"tracks":[{"trackId":3,"type":"VIDEO","trackContentId":"3","name":"Susanita","language":"es"}],"customData":{"description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit"}},"currentItemId":1,"extendedStatus":{"playerState":"LOADING","media":{"contentId":"http://clips.vorwaerts-gmbh.de/VfE_html5.mp4","streamType":"BUFFERED","contentType":"video/mp4","metadata":{"metadataType":1,"images":[{"url":"http://cachepicapica.gomovil.co/videos-transcoded/fd42e6b6-b1f8-4eee-87c9-9b024ea41f0b/thumbnail.jpg","width":0,"height":0},{"url":"http://cachepicapica.gomovil.co/videos-transcoded/fd42e6b6-b1f8-4eee-87c9-9b024ea41f0b/thumbnail.jpg","width":0,"height":0}],"title":"Susanita","subtitle":"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit"},"tracks":[{"trackId":3,"type":"VIDEO","trackContentId":"3","name":"Susanita","language":"es"}],"customData":{"description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit"}}},"repeatMode":"REPEAT_OFF"}],"requestId":0}

我在JSON中看到volume字段为空，它应该有一个level字段和mute字段 . 我认为这是错误，但我不知道如何修复它，因为json是从Google SDK构建的 .

有任何想法吗？

谢谢！

更新：尝试使用Styled接收器，它只适用于MP4文件，但它不适用于HLS流 . 在两次尝试中，上面显示的错误都没有出现 .