ios - Video upload with FacebookSDK -

i'm trying upload video file ios facebooks graphapi. sadly it's not working expected. although this says local .mov should supported, im getting following error:

error: error domain=com.facebook.sdk.core code=8 "the operation couldn’t completed. (com.facebook.sdk.core error 8.)" userinfo=0x161a2f30 {com.facebook.sdk:fbsdkgraphrequesterrorgrapherrorcode=352, com.facebook.sdk:fbsdkgraphrequesterrorparsedjsonresponsekey={ body =     {     error =         {         code = 352;         message = "(#352) sorry, video file selected in format don't support.";         type = oauthexception;     }; }; code = 400; },  com.facebook.sdk:fbsdkgraphrequesterrorhttpstatuscodekey=400, com.facebook.sdk:fbsdkerrordevelopermessagekey=(#352) sorry, video file selected in format don't support., com.facebook.sdk:fbsdkgraphrequesterrorcategorykey=0} 

my code follows:

//outlet 4 picking movie file photolibrary         @ibaction func sharevideo(sender: uibutton) {         if uiimagepickercontroller.issourcetypeavailable(uiimagepickercontrollersourcetype.photolibrary){             println("video capture")             imagepicker.delegate = self             imagepicker.sourcetype = uiimagepickercontrollersourcetype.photolibrary             imagepicker.allowsediting = false             imagepicker.mediatypes = [kuttypemovie]             self.presentviewcontroller(imagepicker, animated: true, completion: nil)         }     }   func imagepickercontroller(picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [nsobject : anyobject]) {         println(info)          //stoping imagepickerview         imagepicker.dismissviewcontrolleranimated(true, completion: nil)      var videodatei : nsdata = nsdata(contentsofurl: info[uiimagepickercontrollermediaurl] as! nsurl)!      var params : nsdictionary = ["source" : videodatei ]      var token = fbsdkaccesstoken.currentaccesstoken().tokenstring        var videorequest : fbsdkgraphrequest = fbsdkgraphrequest(graphpath: "me/videos", parameters: params [nsobject : anyobject], tokenstring: token, version: nil, httpmethod: "post")     videorequest.startwithcompletionhandler({ (connection, result, error) -> void in          if ((error) != nil)         {             // process error             println("error: \(error)")          }         else         {             println(result)         }     }) } 

facebooksdk documentation doesn't give example code videoupload apart from

nsdictionary *params = @{  @"source": @"{video-data}", }; 

and sending request, no information on {video-data} apart "multipart/form-data" don't understand.

info: ios 8.3 swift facebooksdk v.4.1.0 fbsdk graphapi v.2.3

thanks time, rolf