处理视频数据报错！

[linkedbyte]

将视频流程中的人脸美颜后输出，
下面是用法：
lipstick_filter = LipstickFilter::create();
blusher_filter = BlusherFilter::create();
face_reshape_filter = FaceReshapeFilter::create();

创建用于处理视频流的输入对象
source_raw_input = SourceRawDataInput::create();
source_raw_input->RegLandmarkCallback([=](std::vector landmarks) {
lipstick_filter->SetFaceLandmarks(landmarks);
blusher_filter->SetFaceLandmarks(landmarks);
face_reshape_filter->SetFaceLandmarks(landmarks);
});

beauty_face_filter = BeautyFaceFilter::create();

获取处理结果的输出对象及回调
source_output = TargetRawDataOutput::create();
source_output->setPixelsCallbck(
[=](const uint8_t* data, int width, int height, int64_t timestamp) {

	std::cout << "target output callback" << std::endl;
});

source_raw_input->addTarget(lipstick_filter)
->addTarget(blusher_filter)
->addTarget(face_reshape_filter)
->addTarget(beauty_face_filter)
->addTarget(source_output);

将解析后的视频流逐帧调用
source_raw_input->uploadBytes(videoData,width, height, width);

发现如下问题：
TargetRawDataOutput中的
GLubyte* ptr = (GLubyte*)glMapBuffer(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY);
始终返回null,
glGetError()获取的值为1282