iphone - Getting Audio Portion of Video Saved on Camera Roll iOS -


i want audio file of video saved iphones camera roll. have code play video don't know how actual video file , convert mp3 there.

this have far. 

 - (ibaction)playvideo:(id)sender { [self startmediabrowserfromviewcontroller: self usingdelegate: self]; }  - (bool) startmediabrowserfromviewcontroller: (uiviewcontroller*) controller                            usingdelegate: (id <uiimagepickercontrollerdelegate,                                            uinavigationcontrollerdelegate>) delegate{  if (([uiimagepickercontroller issourcetypeavailable:       uiimagepickercontrollersourcetypesavedphotosalbum] == no)     || (delegate == nil)     || (controller == nil))     return no;  uiimagepickercontroller *mediaui = [[uiimagepickercontroller alloc] init]; mediaui.sourcetype = uiimagepickercontrollersourcetypesavedphotosalbum;  mediaui.mediatypes = [[nsarray alloc] initwithobjects: (nsstring *) kuttypemovie, nil];  mediaui.allowsediting = yes;  mediaui.delegate = delegate;  [controller presentmodalviewcontroller: mediaui animated: yes]; return yes;  }   - (void) imagepickercontrollerdidcancel: (uiimagepickercontroller *) picker {  [self dismissmodalviewcontrolleranimated: yes]; }   - (void) imagepickercontroller: (uiimagepickercontroller *) picker  didfinishpickingmediawithinfo: (nsdictionary *) info {  nsstring *mediatype = [info objectforkey: uiimagepickercontrollermediatype];  [self dismissmodalviewcontrolleranimated:no];  if (cfstringcompare ((__bridge_retained cfstringref)mediatype, kuttypemovie, 0)     == kcfcompareequalto) {      nsstring *moviepath = [[info objectforkey:                             uiimagepickercontrollermediaurl] path];     mpmovieplayerviewcontroller* themovie =     [[mpmovieplayerviewcontroller alloc] initwithcontenturl: [info objectforkey:                                                               uiimagepickercontrollermediaurl]];     [self presentmovieplayerviewcontrolleranimated:themovie];      [[nsnotificationcenter defaultcenter]      addobserver: self      selector: @selector(mymoviefinishedcallback:)      name: mpmovieplayerplaybackdidfinishnotification      object: themovie];   } }  -(void) mymoviefinishedcallback: (nsnotification*) anotification { [self dismissmovieplayerviewcontrolleranimated];  mpmovieplayercontroller* themovie = [anotification object];  [[nsnotificationcenter defaultcenter]  removeobserver: self  name: mpmovieplayerplaybackdidfinishnotification  object: themovie];  }


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