python将YUV420P文件转PNG图片格式的两种方法_Python

python将YUV420P文件转PNG图片格式的两种方法

2021-08-28 00:26遇见YY Python

这篇文章主要介绍了python将YUV420P文件转PNG图片格式的两种方法，帮助大家更好的理解和使用python，感兴趣的朋友可以了解下

方法一：

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									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：

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									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

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									#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;

									}