Question

我正在构建一个iOS应用，将视频内容从DLNA / UPnP媒体服务器投射到Chromecast。当我为字幕添加媒体轨道数据时出现问题。以下作品：

### Media Manager - LOAD: {
"type":"load",
"I":false,
"defaultPrevented":false,
"kb":true,
"data":
{
    "currentTime":0,
    "requestId":3,
    "autoplay":true,
    "media":
    {
        "metadata":
        {
            "title":"movie.mp4",
            "subtitle":"Unknown",
            "images":
            [{
                "url":"http://192.168.1.15:8895/resource/625/COVER_IMAGE",
                "width":200,
                "height":100
            }],
            "metadataType":0
        },
        "textTrackStyle":
        {
            "windowRoundedCornerRadius":8,
            "windowType":"ROUNDED_CORNERS",
            "foregroundColor":"#FFFFFFFF",
            "fontFamily":"Helvetica",
            "fontGenericFamily":"SANS_SERIF",
            "fontStyle":"BOLD",
            "fontScale":1,
            "windowColor":"#000000FF",
            "backgroundColor":"#000000FF"
        },
        "contentId":"http://192.168.1.15:8895/resource/338/MEDIA_ITEM/AVC_MP4_MP_SD_AAC_MULT5-0/ORIGINAL",
        "contentType":"video/mp4",
        "streamType":"NONE",
        "duration":0
    }
},
"senderId":"33:3EA56D16-D18E-4D13-87A0-717DC188F8AF"}

但是当我添加自己的标题或者来自CastVideos示例应用程序的标题时（为了确保它已启用CORS），它将无法使用：

### Media Manager - LOAD: {
"type":"load",
"I":false,
"defaultPrevented":false,
"kb":true,
"data":
{
    "currentTime":0,
    "requestId":4,
    "autoplay":true,
    "media":
    {
        "tracks":
        [{
            "trackId":1,
            "trackContentId":"https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/GoogleIO-2014-CastingToTheFuture2-en.vtt",
            "language":"en-US",
            "subtype":"CAPTIONS",
            "type":"TEXT",
            "trackContentType":"text/vtt",
            "name":"English Subtitle"
        }],
        "contentId":"http://192.168.1.15:8895/resource/338/MEDIA_ITEM/AVC_MP4_MP_SD_AAC_MULT5-0/ORIGINAL",
        "streamType":"NONE",
        "contentType":"video/mp4",
        "duration":0,
        "metadata":
        {
            "title":"movie.mp4",
            "subtitle":"Unknown",
            "images":
            [{
                "url":"http://192.168.1.15:8895/resource/625/COVER_IMAGE",
                "width":200,
                "height":100
            }],
            "metadataType":0
        },
        "textTrackStyle":
        {
            "windowRoundedCornerRadius":8,
            "windowType":"ROUNDED_CORNERS",
            "foregroundColor":"#FFFFFFFF",
            "fontFamily":"Helvetica",
            "fontGenericFamily":
            "SANS_SERIF",
            "fontStyle":"BOLD",
            "fontScale":1,
            "windowColor":
            "#000000FF",
            "backgroundColor":"#000000FF"
        }
    }
},
"senderId":"11:9D7D43C2-CD85-4143-82AA-2D0056AA62FC" }

我明白了：

[cast.receiver.MediaManager] Load metadata error cast_receiver.js:18

然而，Sample应用程序与我的自定义接收器中的标题一起使用没有任何问题，我没有发现太大的区别（视频/图像http URL除外，我只是收到警告）：

### Media Manager - LOAD: {
"type":"load",
"I":false,
"defaultPrevented":false,
"kb":true,
"data":
{
    "currentTime":0,
    "requestId":3,
    "autoplay":true,
    "media":
    {
        "tracks":
        [{
            "trackId":1,
            "trackContentId":"https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/DesigningForGoogleCast-en.vtt",
            "language":"en-US",
            "subtype":"CAPTIONS",
            "type":"TEXT",
            "trackContentType":"text/vtt",
            "name":"English Subtitle"
        }],
        "contentId":"https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/DesigningForGoogleCast.mp4",
        "streamType":"NONE",
        "contentType":"video/mp4",
        "duration":0,
        "metadata":
        {
            "title":"Designing For Google Cast",
            "subtitle":"Google IO - 2014",
            "images":
            [{
                "url":"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/images_480x270/DesigningForGoogleCast2-480x270.jpg",
                "width":200,
                "height":100
            }],
            "metadataType":0
        },
        "textTrackStyle":
        {
            "windowRoundedCornerRadius":8,
            "windowType":"ROUNDED_CORNERS",
            "foregroundColor":"#FFFFFFFF",
            "fontFamily":"Helvetica",
            "fontGenericFamily":"SANS_SERIF",
            "fontStyle":"BOLD",
            "fontScale":1,
            "windowColor":"#000000FF",
            "backgroundColor":"#000000FF"
        }
    }
},
"senderId":"46:F162E34A-1A6D-4C0C-A0A3-DB584C92CDF5" }

任何想法？

提前感谢。

Answer 1

在Chromecast中使用字幕时，CORS不仅需要字幕，还需要视频流。就我而言，视频HTTP服务器（例如Serviio）不支持它。

谷歌Chromecast：无法使用iOS中的标题转换视频/ mp4，导致加载元数据错误

1 个答案: