python将YUV420P文件转PNG图片格式的两种方法

方法一：

import os
import cv2 as cv
import numpy as np

# 读取yuv420p的一帧文件，并转化为png图片
if __name__ == '__main__':
 filepath = 'one_frame_of_highway.yuv'
 binfile = open(filepath, 'rb')
 size = os.path.getsize(filepath)
 image_width = 352
 image_hight = 288
 image_y = [[0] * image_width for i in range(image_hight)]
 image_u = [[0] * image_width for i in range(image_hight)]
 image_v = [[0] * image_width for i in range(image_hight)]
 for r in range(image_hight):
   for c in range(image_width):
     image_y[r][c] = binfile.read(1)[0]
 Image_Y = np.array(image_y)

for r in range(int(image_hight / 2)):
   for c in range(int(image_width / 2)):
     pixel = binfile.read(1)[0]
     image_u[2 * r + 0][2 * c + 0] = pixel
     image_u[2 * r + 1][2 * c + 0] = pixel
     image_u[2 * r + 0][2 * c + 1] = pixel
     image_u[2 * r + 1][2 * c + 1] = pixel
 Image_U = np.array(image_u)

for r in range(int(image_hight / 2)):
   for c in range(int(image_width / 2)):
     pixel = binfile.read(1)[0]
     image_v[2 * r + 0][2 * c + 0] = pixel
     image_v[2 * r + 0][2 * c + 1] = pixel
     image_v[2 * r + 1][2 * c + 0] = pixel
     image_v[2 * r + 1][2 * c + 1] = pixel
 Image_V = np.array(image_v)
 binfile.close()
 compose = np.array([Image_Y, Image_V, Image_U]).transpose([1, 2, 0]).astype(np.uint8)
 Image = cv.cvtColor(compose, cv.COLOR_YUV2RGB)
 cv.imwrite("one_frame_of_highway.yuv.png", Image)

方法二：

ffmpeg -s 352x288 -i one_frame_of_highway.yuv one_frame_of_highway.png

highway视频网址：http://trace.eas.asu.edu/yuv/index.html

附录：

将yuv文件转化为一帧帧yuv文件

#include <stdio.h>
#include <fcntl.h>
#include <zconf.h>
#include <stdint.h>
#include <strings.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
int File_Size(int fd) {
 struct stat st;
 fstat(fd, &st);
 return st.st_size;
}

int Frame_Size_Of_Cif() {
 int width = 352;
 int heigh = 288;
 int Y_SIZE = width * heigh;
 int U_SIZE = Y_SIZE / 4;
 int V_SIZE = Y_SIZE / 4;
 int Frame_SIZE = Y_SIZE + U_SIZE + V_SIZE;
 return Frame_SIZE;
}

int Frames_Of_Cif_File(int fd) {
 if (fd < 0) {
   printf("Invalid FD!");
   return -1;
 }
 int Frame_SIZE = Frame_Size_Of_Cif();
 int fd_size = File_Size(fd);
 return fd_size / Frame_SIZE;
}

void Abstract_Frame_From_CIF_File(int fd,char *Path_And_Prefix_Img,int Len) {
 int Frame_SIZE = Frame_Size_Of_Cif();
 char file[128];
 memset(file,0,128);
 memcpy(file,Path_And_Prefix_Img,Len);
 uint8_t buf[Frame_SIZE];
 int ret = -1;
 int frames = 0;
 while ((ret = read(fd, buf, Frame_SIZE))) {
   frames += 1;
   uint64_t len = strlen(file);
   sprintf(file + len, "％d", frames);
   len = strlen(file);
   sprintf(file + len, "％s", ".yuv");
   int fdw = open(file, O_RDWR | O_CREAT, 0777);
   write(fdw, buf, ret);
   memset(file,0,128);
   memcpy(file,Path_And_Prefix_Img,Len);
   close(fdw);
 }
 printf("Abstract ％d frames!\n", frames);
}

int main() {

int fd = open("./yuv420p_352x288.yuv", O_RDONLY);
 Abstract_Frame_From_CIF_File(fd,"/home/liu/Frames/Frames_",strlen("/home/liu/Frames/Frames_"));
 close(fd);
 return 0;
}

来源：https://www.cnblogs.com/iuyy/p/14238301.html