Ios 当图像数据样本用于渲染OpenGL纹理时，捕获静态图像失败

我必须使用

AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection:

捕获一组图像，并使用OpenGL作为纹理在屏幕上渲染它们，为此，我从捕获输出的CMSampleBufferRef传递CVPixelBufferRef。第一次捕获成功，但对于后续捕获，我得到了一个错误

Error Domain=AVFoundationErrorDomain code=-11801“无法完成操作”

代码如下

dispatch_async(dispatch_get_main_queue(), ^{
    if (self.videoConnection) {
        [self.imageOutput captureStillImageAsynchronouslyFromConnection:self.videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
            if (!imageDataSampleBuffer) {
                return ;
            }
            if (imageDataSampleBuffer) {
                CVPixelBufferRef pxBuff = CMSampleBufferGetImageBuffer(imageDataSampleBuffer);
                if ([self.captureDelegate respondsToSelector:@selector(didCaptureBufferRef:)]) {
                    [_captureDelegate didCaptureBufferRef:pxBuff];
                }
            }
        }];
    }});

及

最终调用此函数（我跳过了中间调用，因为pxBuff没有在任何地方使用，只是传递了它）

我做错了什么？当我移除

[_captureDelegate didCaptureBufferRef:pxBuff];

---

事情进展顺利，成功发生

[\u captureDelegate didCaptureBufferRef:pxBuff]内部发生了什么？@SAKrisT，很抱歉耽搁了（必须旅行一个小时才能回家）。我已经添加了def。对于使用CVPixelBufferRef的函数。谢谢
- (void)textureFromBufferRef:(CVPixelBufferRef)pixelBuffer
{
size_t width = CVPixelBufferGetWidth(pixelBuffer);
size_t height = CVPixelBufferGetHeight(pixelBuffer);

glActiveTexture(GL_TEXTURE0);

CVReturn err  = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, _textureCacheRef, pixelBuffer, NULL, GL_TEXTURE_2D, GL_RED_EXT, (GLsizei)width, (GLsizei)height, GL_RED_EXT, GL_UNSIGNED_BYTE, 0, &_captureImageTextureRef);
glBindTexture(CVOpenGLESTextureGetTarget(_captureImageTextureRef), CVOpenGLESTextureGetName(_captureImageTextureRef));
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}

[_captureDelegate didCaptureBufferRef:pxBuff];