ios4 - NSNotification Does Not Notify -

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i have application shows lot of videos. load , play file, use following code:

- (ibaction)playvideoooo { [[uiapplication sharedapplication] setnetworkactivityindicatorvisible:yes]; movieplayercontroller = [[mpmovieplayercontroller alloc] initwithcontenturl:                          [nsurl urlwithstring:@"/unionedicentro2011_live.isml/manifest(format=m3u8-aapl)"]]; switch ( [self interfaceorientation] ) {     case uiinterfaceorientationportrait:     case uiinterfaceorientationportraitupsidedown:         [[movieplayercontroller view] setframe:cgrectmake(0, 0, p_width, p_height)];         break;     case uiinterfaceorientationlandscapeleft:     case uiinterfaceorientationlandscaperight:         [[movieplayercontroller view] setframe:cgrectmake(0, 0, l_width, l_height)];         break; } [movieplayercontroller preparetoplay]; [[nsnotificationcenter defaultcenter] addobserver:self                                           selector:@selector(movieplayerloadstatechanged:)                                               name:mpmovieplayerloadstatedidchangenotification                                             object:nil]; // register load state changed (movie ready) [[nsnotificationcenter defaultcenter] addobserver:self                                           selector:@selector(movieplaybackdidfinish:)                                               name:mpmovieplayerplaybackdidfinishnotification                                             object:nil]; [[self view] addsubview:[movieplayercontroller view]]; }  - (void)movieplayerloadstatechanged:(nsnotification*)notification { // unless state unknown, start playback if ([movieplayercontroller loadstate] != mpmovieloadstateunknown) {     [[nsnotificationcenter defaultcenter] removeobserver:self                                                      name:mpmovieplayerloadstatedidchangenotification                                                    object:nil];     [[uiapplication sharedapplication] setstatusbarorientation:[self interfaceorientation]                                                        animated:yes];             [movieplayercontroller play];     [[uiapplication sharedapplication] setnetworkactivityindicatorvisible:no];  } }  - (void)movieplaybackdidfinish:(nsnotification*)notification {     [[uiapplication sharedapplication] setstatusbarhidden:no]; [[nsnotificationcenter  defaultcenter] removeobserver:self                                                   name:mpmovieplayerplaybackdidfinishnotification                                                 object:nil]; switch ( [self interfaceorientation] ) {     case uiinterfaceorientationportrait:     case uiinterfaceorientationportraitupsidedown:         [[movieplayercontroller view] setframe:cgrectmake(0, 0, p_width, p_height)];         break;     case uiinterfaceorientationlandscapeleft:     case uiinterfaceorientationlandscaperight:         [[movieplayercontroller view] setframe:cgrectmake(0, 0, l_width, l_height)];         break; }        if ( [movieplayercontroller isfullscreen] ) {     [movieplayercontroller setfullscreen:no]; } }

actually system seems works, have push button linked "playvideooooo" 2 times, let notification work. if move [movieplayercontroller play]; ibactions video starts correctly. how should notifications work?

question partially solved: matter not in nsnotification in preparetoplay.


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