【PE】YUV檔案分割,幀率擴倍功能
阿新 • • 發佈:2019-01-23
Date: 2018.5.30
YUV處理實用小工具:
1、隔幀分割:
功能說明:cutYUV.cpp 實現YUV檔案分割為兩個子YUV,隔幀寫入YUV,實現幀率擴倍功能。
/*****************************************************
//Function: split a yuv file to two sub yuv file, fps
// increase twice.
//Date: 2018-5-30
//Author: SoaringLee
//Modified:
*****************************************************/
#include "stdio.h"
#include "stdlib.h"
#include "string"
int main(int argc, char** argv)
{
unsigned char* y;
FILE* fp_input, *fp_out1, *fp_out2;
int width, height, picturesize, framenum = 0;
printf("Usage: splitYUV.exe srcyuv dstyuv1 dstyuv2 width height\n\n");
if (argc < 5)
{
return -1;
}
width = atoi(argv[4]);
height = atoi(argv[5]);
fp_input = fopen(argv[1], "rb");
if (NULL == fp_input)
{
printf("open %s fail!\n", argv[1]);
return -1;
}
fp_out1 = fopen(argv[2], "wb");
if (NULL == fp_out1)
{
printf("open %s fail!\n", argv[2]);
return -1;
}
fp_out2 = fopen (argv[3], "wb");
if (NULL == fp_out2)
{
printf("open %s fail!\n", argv[3]);
return -1;
}
picturesize = width*height * 3 / 2;//++YUV420
y = (unsigned char*)malloc(picturesize*sizeof(unsigned char*));
while (fread(y, 1, picturesize, fp_input) == picturesize)
{
if (framenum % 2 == 0)
{
fwrite(y, 1, picturesize, fp_out1);
}
else
{
fwrite(y, 1, picturesize, fp_out2);
}
framenum++;
}
printf("[SplitYUV] split %s to %s and %s successfully!!!\n", argv[1], argv[2], argv[3]);
free(y);
y = NULL;
fclose(fp_input);
fclose(fp_out1);
fclose(fp_out2);
return 0;
}
另外,還可以通過ffmpeg實現隔幀分割的功能:
ffmpeg -r 2 -s WxH -i rawbitstream.yuv -filter:v select="mod(n-1\,2)" \
-c:v rawvideo -r 1 -format rawvideo -pix_fmt yuv420p -an odd.yuv
ffmpeg -r 2 -s WxH -i rawbitstream.yuv -filter:v select="not(mod(n-1\,2))" \
-c:v rawvideo -r 1 -format rawvideo -pix_fmt yuv420p -an even.yuv
2、分段分割:
Extract some YUV frames from large yuv File
從第0幀開始擷取30幀:
ffmpeg -s widthxheight -i input.yuv -c:v rawvideo -filter:v select="gt(n\, -1)" -vframes 30 out30.yuv
或者:
ffmpeg -s widthxheight -i input.yuv -c:v rawvideo -filter:v select="between(n\, 0\, 29)" out30.yuv
或者:
ffmpeg -r 1 -ss 0 -i input.yuv -vcodec copy -vframes 30 output.yuv
更多命令使用參考:
THE END!