OpenCV中BGR转NV12

1.opencv代码jpg转换yuv420sp（nv12）

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#include <stdio.h> #include <opencv2/opencv.hpp>   int main(int argc, char **argv) {     // 检查输入参数     if(argc != 2){         std::cout << "Usage: img2yuv <image_path>" << std::endl;         return -1;     }       // 读取输入图像     cv::Mat image = cv::imread(argv[1]);     int image_h = image.rows;     int image_w = image.cols;     int image_c = image.channels();     cv::imshow("image", image);     cv::waitKey();       // 转换到I420     cv::Mat I420;                                      // I420格式图像     cv::cvtColor(image, I420, cv::COLOR_BGR2YUV_I420); // 转换I420格式       uint8_t *pI420 = I420.ptr<uint8_t>();              // I420数据指针     int32_t I420_y_s = image_h * image_w;              // I420中 Y长度     int I420_uv_h = image_h / 2;                       // I420中UV高度     int I420_uv_w = image_w / 2;                       // I420中UV宽度       // 转换到NV12     cv::Mat NV12 = cv::Mat(image_h * 3 / 2, image_w, CV_8UC1); // NV12格式图像     uint8_t *pNV12 = NV12.ptr<uint8_t>();                      // NV12数据指针     memcpy(pNV12, pI420, I420_y_s); // 拷贝I420中的Y数据到NV12中       uint8_t *pI420_U = pI420 + I420_y_s;                // 移动I420中U分量指针到U数据头部     uint8_t *pI420_V = pI420_U + I420_uv_h * I420_uv_w; // 移动I420中V分量指针到V数据头部     pNV12 = pNV12 + I420_y_s;                           // 移动NV12指针到U数据头部     for(int i = 0; i < I420_uv_h * I420_uv_w; i++){ // 遍历I420中UV分量数据，复制到NV12中         // 把I420中U数据复制到NV12中U数据对应位置         *pNV12 = *pI420_U;         pNV12++;         pI420_U++;           // 把I420中V数据复制到NV12中V数据对应位置         *pNV12 = *pI420_V;         pNV12++;         pI420_V++;     }       // 保存转换图像     FILE *fp = fopen("output/result.yuv", "wb");     int image_len = image_w * image_h * 3 / 2;     fwrite(NV12.ptr<uint8_t>(), image_len, 1, fp);     fclose(fp);       // 读取转换图像     fp = fopen("output/result.yuv", "rb");     unsigned char *image_buf = new unsigned char[image_len];     fread(image_buf, image_len, 1, fp);     fclose(fp);       // 显示转换图像     cv::Mat image2 = cv::Mat(image_h * 3 / 2, image_w, CV_8UC1, image_buf);     cv::cvtColor(image2, image2, cv::COLOR_YUV2BGR_NV12);     cv::imshow("image2", image2);     cv::waitKey();       return 0; }

 

2.ffmpeg jpg转换yuv420sp（nv12）

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ffmpeg -i data/1_2688_1520.jpg -pix_fmt nv12 output/1_2688_1520.yuv   ffmpeg -y -s 2688x1520 -pix_fmt nv12 -i output/1_2688_1520.yuv output/1_2688_1520.jpg

 

参考地址：

https://blog.csdn.net/nodototao/article/details/120649916

https://www.cnblogs.com/dxscode/p/16196396.html

http://www.javashuo.com/article/p-znuvnhtl-dy.html

https://blog.csdn.net/zfjBIT/article/details/127395512

https://blog.csdn.net/u014613270/article/details/123448481

https://blog.51cto.com/u_15764210/5616675

https://www.fangwenw.com/soft/view-7624.html

https://www.jb51.cc/faq/1292067.html

https://blog.csdn.net/denghp83/article/details/37936643

https://www.cnblogs.com/chenpi/p/5128233.html

 

https://www.cnblogs.com/arthurchn/p/13489815.html

https://www.ancii.com/ay1xlqzn/

https://blog.csdn.net/smilestone_322/article/details/21104871

https://blog.csdn.net/weixin_38427663/article/details/107106092

https://blog.csdn.net/weixin_45736829/article/details/108382920

https://blog.csdn.net/laoyouji/article/details/100051158