OpenCV long video truncation
Why not use PR, editing, or PotPlayer? I'm handicapped, I don't know
how to use these to make a video with only 15 frames and less than 1 second. It's really killing a chicken with a knife.
1.opencv reads video frames and saves them
Break long videos into frame by frame
#include <opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;
int main()
{
VideoCapture capture("C:/Users/wwy/Desktop/test.mp4");//视频路径
int i = 0;
while (1)
{
i++;
Mat img;
capture >> img;
if (img.empty()) {
printf("播放完成\n");
break;
}
imshow("res", img);//显示图片
string ii = std::to_string(i);
string path = "C:/Users/wwy/Desktop/111/" + ii+ ".jpg";//保存路径
imwrite(path,img);
waitKey(1);
}
waitKey(0);
system("path");
getchar();
return 0;
}
2. Opencv converts a large number of videos into frames (c++)
Due to my rough knowledge, this program is not very smooth and I need to keep pressing the Enter key to keep running.
#include <opencv2/opencv.hpp>
#include<iostream>
#include <fstream>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include<io.h>
using namespace std;
using namespace cv;
void getAllFiles(string path, vector<string>& files);
typedef std::vector<std::string> StringList;
StringList splitstr(const std::string& str, char tag);
int main()
{
string DATA_DIR = "C:/Users/大喵喵/Desktop/input";//视频所在文件夹
vector<string> files;
//测试
char * DistAll = (char*)"AllFiles.txt";
getAllFiles(DATA_DIR, files);//所有文件与文件夹的路径都输出
int size = files.size();
int FaiNum = 0;
cout << size << endl;
for (int k = 0; k < size; k++)
{
cout << files[k] << endl;
vector<string> name;
name = splitstr(files[k], '/');
cout << name[name.size()-1] << endl;
string imgsName= name[name.size() - 1].substr(0, name[name.size() - 1].length() - 4);
cout << imgsName << endl;
VideoCapture capture(files[k]);//视频路径
int i = 0;
while (1)
{
i++;
Mat img;
capture >> img;
if (img.empty()) {
printf("播放完成\n");
break;
}
imshow("res", img);//显示图片
string ii = std::to_string(i);
string path = "C:/Users/大喵喵/Desktop/refFrames/"+imgsName + ii + ".jpg";//保存路径
imwrite(path, img);
waitKey(1);
}
system("path");
getchar();
}
return 0;
}
void getAllFiles(string path, vector<string>& files)
{
//文件句柄
intptr_t hFile = 0;
//文件信息
struct _finddata_t fileinfo; //很少用的文件信息读取结构
string p; //string类很有意思的一个赋值函数:assign()，有很多重载版本
if ((hFile = _findfirst(p.assign(path).append("\\*").c_str(), &fileinfo)) != -1)
{
do
{
if ((fileinfo.attrib & _A_SUBDIR)) //判断是否为文件夹
{
if (strcmp(fileinfo.name, ".") != 0 && strcmp(fileinfo.name, "..") != 0)
{
files.push_back(p.assign(path).append("/").append(fileinfo.name));//保存文件夹名字
getAllFiles(p.assign(path).append("/").append(fileinfo.name), files);//递归当前文件夹
}
}
else //文件处理
{
files.push_back(p.assign(path).append("/").append(fileinfo.name));//文件名
}
} while (_findnext(hFile, &fileinfo) == 0); //寻找下一个，成功返回0，否则-1
_findclose(hFile);
}
}
/*
分割字符串
*/
StringList splitstr(const std::string& str, char tag)
{
StringList li;
std::string subStr;
//遍历字符串，同时将i位置的字符放入到子串中，当遇到tag（需要切割的字符时）完成一次切割
//遍历结束之后即可得到切割后的字符串数组
for (size_t i = 0; i < str.length(); i++)
{
if (tag == str[i]) //完成一次切割
{
if (!subStr.empty())
{
li.push_back(subStr);
subStr.clear();
}
}
else //将i位置的字符放入子串
{
subStr.push_back(str[i]);
}
}
if (!subStr.empty()) //剩余的子串作为最后的子字符串
{
li.push_back(subStr);
}
return li;
}
3.opencv multi-frame video synthesis (c++)
Combine pictures into videos and put the pictures in a folder. The naming format should be: 1.jpg, 2.jpg, 3.jpg...
Currently only the MP4 format has been successful, and the others have not been tried.
// TestForOnlyC++.cpp : 定义控制台应用程序的入口点。
//
/*
为了保证视频帧顺序，对图片命名要有顺序逻辑，对于本代码，图片命名格式需要为1.jpg、2.jpg...
*/
#include <fstream>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include<io.h>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
void getAllFiles(string path, vector<string>& files);
//测试
int main()
{
int frames = 15;//一条视频多少帧
string DATA_DIR = "C:/Users/wwy/Desktop/111/";//图片所在文件夹
vector<string> files;
char * DistAll = (char*)"AllFiles.txt";
getAllFiles(DATA_DIR, files);//所有文件与文件夹的路径都输出
int size = files.size();
cout << "图片一共"<<size <<"张"<< endl;
int videoNum = size / frames;
int MaxFrame = videoNum * (frames-1);
cout << "可以制作" << videoNum << "条视频" << endl;
int video_wight = 480;
int video_hight = 320;
for (int i = 1; i < videoNum + 1; i++) {
cv::VideoWriter Writer;
string i_string= to_string(i);
string filepath = "C:/Users/wwy/Desktop/111/1/"+i_string+".mp4";
Writer.open(filepath, VideoWriter::fourcc('M', 'P', '4', '2'), 25, Size(video_wight, video_hight), 1);
if (!Writer.isOpened())
{
cout << "无法保存视频" << endl;
}
else {
for (int cou = frames*i-(frames-1); cou < frames * i+1&& MaxFrame; cou++)
{
string ii = to_string(cou);
string path = DATA_DIR + ii + ".jpg";
Mat src = imread(path);
resize(src, src, Size(video_wight, video_hight), 0, 0, INTER_LINEAR);
//imshow("res", src);//显示图片
cout << path << endl;
Writer.write(src);//输出视频
}
cout << "保存成功" << endl;
}
Writer.release();
}
waitKey(0);
return 0;
}
void getAllFiles(string path, vector<string>& files)
{
//文件句柄
intptr_t hFile = 0;
//文件信息
struct _finddata_t fileinfo; //很少用的文件信息读取结构
string p; //string类很有意思的一个赋值函数:assign()，有很多重载版本
if ((hFile = _findfirst(p.assign(path).append("\\*").c_str(), &fileinfo)) != -1)
{
do
{
if ((fileinfo.attrib & _A_SUBDIR)) //判断是否为文件夹
{
if (strcmp(fileinfo.name, ".") != 0 && strcmp(fileinfo.name, "..") != 0)
{
files.push_back(p.assign(path).append("/").append(fileinfo.name));//保存文件夹名字
getAllFiles(p.assign(path).append("/").append(fileinfo.name), files);//递归当前文件夹
}
}
else //文件处理
{
files.push_back(p.assign(path).append("/").append(fileinfo.name));//文件名
}
} while (_findnext(hFile, &fileinfo) == 0); //寻找下一个，成功返回0，否则-1
_findclose(hFile);
}
}
4.opencv multi-frame video synthesis (python)
import cv2
import os
def images_to_video():
fps = 25 # 帧率
num_frames = 500
img_array = []
img_width = 320 #一定要根据自己图片进行更改
img_height = 240
path = "/home/user/WWY/results/test_results0/test/"
imglist = os.listdir(path)
print(imglist)
imglist.sort(key=lambda x: int(x[0:-4]))
print(imglist)
#imgt=cv2.imread("/home/user/WWY/results/test_results0/test/8.png")
#cv2.imshow("1",imgt)
#cv2.waitKey(0)
for file_name in os.listdir(path):
img = cv2.imread(path + file_name)
dim=(img_width,img_height)
resized=cv2.resize(img,dim,interpolation=cv2.INTER_AREA)
print(path + file_name)
if img is None:
print(file_name + " is non-existent!")
continue
img_array.append(resized)
out = cv2.VideoWriter('demo_1.avi', cv2.VideoWriter_fourcc(*'XVID'), fps, (img_width, img_height))
#out = cv2.VideoWriter('demo_people.mp4', cv2.VideoWriter_fourcc(*'mp4v'), fps, (img_width, img_height))
for i in range(len(img_array)):
out.write(img_array[i])
out.release()
def main():
images_to_video()
if __name__ == "__main__":
main()
5. opencv multi-frame synthesis fixed-length video (python)
import cv2
import os
import natsort
def images_to_video():
fps = 25 # 帧率
num_frames = 15
img_array = []
img_width = 960
img_height = 540
path = "C:/Users/wwy/Desktop/TSRWGAN/mydata/imgs/"
names = natsort.natsorted(os.listdir(path),alg = natsort.ns.PATH)
#print(names)
for file_name in names:
#print(name)
#for file_name in os.listdir(path):
img = cv2.imread(path + file_name)
dim=(img_width,img_height)
resized=cv2.resize(img,dim,interpolation=cv2.INTER_AREA)
if img is None:
print(file_name + " is non-existent!")
continue
img_array.append(resized)
#out = cv2.VideoWriter('demo_people.mp4', cv2.VideoWriter_fourcc(*'mp4v'), fps, (img_width, img_height))
video_num = int(len(names) / num_frames )
k = 0;
for w in range(1,video_num):
out = cv2.VideoWriter("C:/Users/wwy/Desktop/TSRWGAN/mydata/video15fs/"+str(w)+'.avi', cv2.VideoWriter_fourcc(*'XVID'), fps, (img_width, img_height))
for i in range(k,k+num_frames):
out.write(img_array[i])
out.release()
k = k+num_frames
print(k)
def main():
images_to_video()
if __name__ == "__main__":
main()