将yuyv422 转成yuv420p
时间: 2023-07-30 11:06:52 浏览: 253
要将YUYV422转换为YUV420P格式,你可以使用FFmpeg等多媒体处理工具来完成这个任务。下面是使用FFmpeg进行转换的命令行示例:
```bash
ffmpeg -s <width>x<height> -pix_fmt yuyv422 -i input.yuv -vf "format=yuv420p" output.yuv
```
请将 `<width>` 替换为图像的宽度,`<height>` 替换为图像的高度。然后将 `input.yuv` 替换为输入文件名,`output.yuv` 替换为输出文件名。
这个命令将会读取YUYV422格式的输入文件,并通过 `-vf` 参数中的 `format=yuv420p` 过滤器将其转换为YUV420P格式的输出文件。
请注意,你需要提前安装FFmpeg,并确保它在你的系统中可用。此外,还可以通过编程语言中的多媒体库来实现这个转换过程。具体实现方式将取决于你所使用的编程语言和库。
相关问题
请写出将yuyv数据转换成yuv420p的程序,要求输入文件input.yuyv 输出文件output.yuv ,请用C语言实现程序
以下是将yuyv数据转换成yuv420p的C语言程序:
```c
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
if (argc < 3) {
fprintf(stderr, "Usage: %s input.yuyv output.yuv\n", argv[0]);
return 1;
}
char *input_file = argv[1];
char *output_file = argv[2];
FILE *input_fp = fopen(input_file, "rb");
if (input_fp == NULL) {
fprintf(stderr, "Error: Cannot open input file %s\n", input_file);
return 1;
}
FILE *output_fp = fopen(output_file, "wb");
if (output_fp == NULL) {
fprintf(stderr, "Error: Cannot open output file %s\n", output_file);
return 1;
}
int width = 640;
int height = 480;
int y_size = width * height;
int uv_size = y_size / 4;
unsigned char *yuyv_buffer = (unsigned char *)malloc(y_size * 2);
unsigned char *y_buffer = (unsigned char *)malloc(y_size);
unsigned char *u_buffer = (unsigned char *)malloc(uv_size);
unsigned char *v_buffer = (unsigned char *)malloc(uv_size);
int frame_count = 0;
while (fread(yuyv_buffer, 1, y_size * 2, input_fp) == y_size * 2) {
frame_count++;
// YUYV to YUV420P conversion
for (int i = 0, y = 0; i < y_size * 2; i += 4, y++) {
y_buffer[y] = yuyv_buffer[i];
if (y % 2 == 0) {
u_buffer[y / 4] = yuyv_buffer[i + 1];
v_buffer[y / 4] = yuyv_buffer[i + 3];
}
}
// Write YUV420P frame to output file
fwrite(y_buffer, 1, y_size, output_fp);
fwrite(u_buffer, 1, uv_size, output_fp);
fwrite(v_buffer, 1, uv_size, output_fp);
}
free(yuyv_buffer);
free(y_buffer);
free(u_buffer);
free(v_buffer);
fclose(input_fp);
fclose(output_fp);
printf("Converted %d frames.\n", frame_count);
return 0;
}
```
这个程序通过打开输入文件、输出文件,从输入文件读取YUYV数据,将其转换成YUV420P格式,然后写入输出文件。在上面的程序中,我们假设输入图像的分辨率为640x480像素,因此YUV420P图像的大小是640x480x3/2=460800字节。
重新写出将yuyv数据转换成yuv420p的程序,要求输入文件input.yuyv 输出文件output.yuv ,请用C语言实现程序
好的,这里是将yuyv数据转换成yuv420p的C语言程序:
```c
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
if (argc != 3) {
printf("Usage: %s input.yuyv output.yuv\n", argv[0]);
return 1;
}
FILE *fin = fopen(argv[1], "rb");
if (!fin) {
printf("Failed to open input file: %s\n", argv[1]);
return 1;
}
FILE *fout = fopen(argv[2], "wb");
if (!fout) {
printf("Failed to open output file: %s\n", argv[2]);
fclose(fin);
return 1;
}
int width = 640;
int height = 480;
int y_size = width * height;
int uv_size = y_size / 4;
unsigned char *yuyv = (unsigned char *) malloc(y_size * 2);
unsigned char *yuv420p = (unsigned char *) malloc(y_size * 3 / 2);
while (fread(yuyv, 1, y_size * 2, fin) == y_size * 2) {
for (int i = 0, j = 0; i < y_size * 2; i += 4, j += 6) {
// Convert YUYV to YUV420P
yuv420p[j] = yuyv[i];
yuv420p[j + 1] = yuyv[i + 1];
yuv420p[j + 2] = yuyv[i + 3];
yuv420p[j + 3] = yuyv[i + 2];
}
// Copy U and V channels
for (int i = 0; i < uv_size; i++) {
yuv420p[y_size + i] = yuyv[y_size * 2 + i * 2 + 1];
yuv420p[y_size + uv_size + i] = yuyv[y_size * 2 + i * 2];
}
fwrite(yuv420p, 1, y_size * 3 / 2, fout);
}
free(yuyv);
free(yuv420p);
fclose(fin);
fclose(fout);
return 0;
}
```
这个程序会读取名为 `input.yuyv` 的文件,将其中的 YUYV 格式数据转换成 YUV420P 格式,然后写入名为 `output.yuv` 的文件中。程序假定输入文件的分辨率为 640x480,输出文件的 Y、U、V 分量为连续存储的。
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