iOS - iPhone - AVAssetWriter AVCapture会话录制绿色边缘视频

Question

我正在使用AVCaptureSession将带有AVAssetWriter的视频录制到文件中，一切正常，但由于某种原因，视频的右侧和底部都有绿色边缘。我如何摆脱它们？

更新这在iPhone 6上发生，但不是iphone 5s。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 };