如何给视频加边框

• 提取YUV数据
  ffmpeg -i input.mp4 -s 256x256 -pix_fmt yuv420p output_420.yuv

• 将亮度分量Y设置成255

int simplest_yuv420_border(char *url, int w, int h,int border,int num){
    FILE *fp=fopen(url,"rb+");
    FILE *fp1=fopen("/Users/zhongyizengzy/Downloads/outputvideo/output_420_border.yuv","wb+");


    unsigned char *pic=(unsigned char *)malloc(w*h*3/2);

    for(int i=0;i<num;i++){

        fread(pic,1,w*h*3/2,fp);


        for(int j=0;j<h;j++){
            for(int k=0;k<w;k++){
                if(k<border||k>w-border||j<border||j>h-border){
                    pic[j*w+k] =255;
                }
            }
        }
        //Y
        fwrite(pic,1,w*h*3/2,fp1);


    }

    free(pic);
    fclose(fp);
    fclose(fp1);


    return 0;
}

• 执行

    simplest_yuv420_border("/Users/zhongyizengzy/Downloads/outputvideo/output_420.yuv",256,256,10,240)
  

• 将在border内的Y分量设置为255，处理帧数为240