拍摄视频时将相机从后向后更改会引起奇怪的问题

Question

我正在创建相机应用，该相机使用 SCRecorder 捕获视频。我正在尝试对视频应用多个过滤器。我正在按以下方式更改Recorder的视频配置

func swipeableFilterView(_ swipeableFilterView: SCSwipeableFilterView, didScrollTo filter: SCFilter?) {
    selectedFilter = filter!
    recorder.videoConfiguration.filter = filter!
}

当我将摄像头改回前部时，我正在使用应用滤镜捕获视频，然后在右侧出现黑屏，成为波纹图像：

带有后置摄像头，它将完美工作

这是appendVideoSampleBuffer的代码

- (void)appendVideoSampleBuffer:(CMSampleBufferRef)sampleBuffer toRecordSession:(SCRecordSession *)recordSession duration:(CMTime)duration connection:(AVCaptureConnection *)connection completion:(void(^)(BOOL success))completion {
    @autoreleasepool {
        CVPixelBufferRef sampleBufferImage = CMSampleBufferGetImageBuffer(sampleBuffer);

        size_t bufferWidth = (CGFloat)CVPixelBufferGetWidth(sampleBufferImage);
        size_t bufferHeight = (CGFloat)CVPixelBufferGetHeight(sampleBufferImage);

        CMTime time = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
        SCFilter *filterGroup = _videoConfiguration.filter;
        SCFilter *transformFilter = [self _transformFilterUsingBufferWidth:bufferWidth bufferHeight:bufferHeight mirrored:
                                     _device == AVCaptureDevicePositionFront
                                     ];

            if (filterGroup == nil && transformFilter == nil) {
                [recordSession appendVideoPixelBuffer:sampleBufferImage atTime:time duration:duration completion:completion];
                return;
            }

        CVPixelBufferRef pixelBuffer = [recordSession createPixelBuffer];

        if (pixelBuffer == nil) {
            completion(NO);
            return;
        }

        CIImage *image = [CIImage imageWithCVPixelBuffer:sampleBufferImage];
        CFTimeInterval seconds = CMTimeGetSeconds(time);

            if (transformFilter != nil) {
                image = [transformFilter imageByProcessingImage:image atTime:seconds];
            }

            if (filterGroup != nil) {
                image = [filterGroup imageByProcessingImage:image atTime:seconds];
            }

        CVPixelBufferLockBaseAddress(pixelBuffer, 0);

        [_context render:image toCVPixelBuffer:pixelBuffer];

        [recordSession appendVideoPixelBuffer:pixelBuffer atTime:time duration:duration completion:^(BOOL success) {
            CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);

            CVPixelBufferRelease(pixelBuffer);

            completion(success);
        }];
    }
}

我调试了代码，我认为问题出在

     CVPixelBufferLockBaseAddress(pixelBuffer, 0);

任何人请帮助我！