Learning opencv: 简单视频截图并保存

 

以下程度是把一个视频的所有的帧都保存起来。

 

我的一段6秒钟的视频保存了165个截图，有点惊讶。

 

#include "stdafx.h"#include "cv.h"#include "highgui.h"#include <stdlib.h>#include <string>#include <assert.h>using namespace std;const char* SAVE_DIR = "I://pic//";char* get_file_name(const char* dir, int index, const char* format);int play_video_and_screen_shot(const char* filename){int shot_num = 0;//open a video fileCvCapture* capture = cvCreateFileCapture( filename );//catch every query frame while(1){//get frameIplImage* frame = cvQueryFrame( capture );if( !frame ) break;shot_num++;//save frame to destination directorycvSaveImage(get_file_name(SAVE_DIR,shot_num,"jpg"),frame);}return shot_num;}char* get_file_name(const char* dir, int index, const char* format){assert(index >= 0);//convert the index to charchar* id = new char[256];itoa(index,id,10);string dir_str(dir);string idx_str(id);string format_str(format);string fn_str = dir_str + idx_str + '.' + format_str;if(fn_str.length() == 0)return NULL;char* fn = new char[fn_str.length()];strcpy(fn,fn_str.data());return fn;}