iOS-iPhone-AVAssetWriter AVCapture会话使用绿色边缘录制视频

我使用AVCaptureSession将使用AVAssetWriter的视频录制到一个文件中，一切正常，但由于某些原因，视频的右侧和底部有绿色边缘。我怎样才能摆脱它们

更新：这发生在iPhone 6上，而不是iPhone 5s上。我还没有在其他设备上试过

以下是我使用的设置：

 //Video output settings for 
 NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_32BGRA],kCVPixelBufferPixelFormatTypeKey,
[NSNumber numberWithInt:videoWidth], AVVideoWidthKey, 
[NSNumber numberWithInt:videoHeight], AVVideoHeightKey, nil];




 //AssetWriter settings
         NSDictionary *videoCleanApertureSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                                [NSNumber numberWithInt:videoWidth], AVVideoCleanApertureWidthKey,
                                                [NSNumber numberWithInt:videoHeight], AVVideoCleanApertureHeightKey,
                                                [NSNumber numberWithInt:10], AVVideoCleanApertureHorizontalOffsetKey,
                                                [NSNumber numberWithInt:10], AVVideoCleanApertureVerticalOffsetKey,
                                                nil];


    CGFloat videoBitRate = 960*1000;
    NSInteger videoFrameRate = 30;
    NSDictionary *compressionSettings = @{ AVVideoAverageBitRateKey : @(videoBitRate),
                                           AVVideoMaxKeyFrameIntervalKey : @(videoFrameRate),
                                           AVVideoCleanApertureKey : videoCleanApertureSettings };



    NSDictionary *videoSettings = @{ AVVideoCodecKey : AVVideoCodecH264,
                                     AVVideoScalingModeKey : AVVideoScalingModeResizeAspectFill,
                                     AVVideoWidthKey : @(videoWidth),
                                     AVVideoHeightKey : @(videoHeight),
                                     AVVideoCompressionPropertiesKey : compressionSettings };

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可能重复，因为iPhone 6的分辨率不是16的倍数。@Ecaptain请参阅重复问题。