Google Chromecast: Unable to cast video/mp4 with captions from iOS getting Load metadata error -

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i building ios app cast video content dlna/upnp media server chromecast. problem appears when add media track data captions. following works:

### 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"}

but when add captions either own or instance castvideos sample app (so make sure cors enabled), won't work with:

### 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" }

i get:

[cast.receiver.mediamanager] load metadata error cast_receiver.js:18

however sample app works captions in custom receiver without problems , don't find of difference (except video/image http url, i'm getting warnings those):

### 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 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" }

any idea?

thanks in advance.

when using captions chromecast, cors required not captions video stream well. in case video http server (e.g. serviio) doesn't support it.


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