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播放RTMP，网络差时，卡时，理论上应该会收到IJKMPMoviePlayerLoadStateDidChangeNotification，_player.loadState == IJKMPMovieLoadStateStalled 才对，

但经常却收到任何消息，包括IJKMPMoviePlayerPlaybackStateDidChangeNotification、IJKMPMoviePlayerLoadStateDidChangeNotification、IJKMPMoviePlayerPlaybackDidFinishNotification都没有，就会出现画面卡在那里，但是却没有processing 图标，some suggestion? thx. @bbcallen

`- (void)loadStateDidChange:(NSNotification*)notification { IJKMPMovieLoadState loadState = _player.loadState; ...... }

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(loadStateDidChange:)
                                             name:IJKMPMoviePlayerLoadStateDidChangeNotification
                                           object:_player];`

log: 此时收到log: decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr

SDL_VoutVideoToolBox_CreateOverlay(w=640, h=480, fmt=_VTB, dp=0x191e5510) 2016-06-14 18:42:10.982 SioEyeAPP[1387:512844] FFP_MSG_VIDEO_SIZE_CHANGED: 640, 480 decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr SDL_VoutVideoToolBox_CreateOverlay(w=640, h=480, fmt=_VTB, dp=0x191e5510) 2016-06-14 18:42:37.779 SioEyeAPP[1387:512844] FFP_MSG_VIDEO_SIZE_CHANGED: 640, 480 decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr decodeFrame -12911 kVTVideoDecoderMalfunctionErr

bilibili / ijkplayer

播放RTMP，网络差时，卡时，经常收不到任何消息 #1464

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