将MP4视频关键帧数据保存成JPEG格式

获取视频文件中的关键帧，并将关键帧数据编码成JPEG格式的文件。

#include“MP4Record.h“

void main（int argc char* argv[]）
{
	
	int ret=-1;
	MP4Record mp4;
	ret=mp4.GetPictureFromMP4（“155701video.mp4““1.jpg“）;
	printf（“ret=%d\n“ret）;
	printf（“录制结束\n“）;
	getchar（）;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-08-24 11:14  NewMP4Record\
     目录           0  2019-08-24 11:15  NewMP4Record\Debug\
     目录           0  2019-08-24 11:12  NewMP4Record\NewMP4Record\
     目录           0  2019-08-24 11:15  NewMP4Record\NewMP4Record\1\
     目录           0  2019-08-24 11:12  NewMP4Record\NewMP4Record\Debug\
     文件       73088  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\CL.read.1.tlog
     文件         872  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\CL.write.1.tlog
     文件      200520  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\MP4Record.obj
     文件        1352  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\NewMP4Record.Build.CppClean.log
     文件          59  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\NewMP4Record.lastbuildstate
     文件        7632  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\NewMP4Record.log
     文件        1286  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\cl.command.1.tlog
     文件           2  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link-cvtres.read.1.tlog
     文件           2  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link-cvtres.write.1.tlog
     文件           2  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link-rc.read.1.tlog
     文件           2  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link-rc.write.1.tlog
     文件        1464  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link.command.1.tlog
     文件        3992  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link.read.1.tlog
     文件         532  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\link.write.1.tlog
     文件      187950  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\main.obj
     文件     1182720  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\vc110.idb
     文件      577536  2019-08-24 10:23  NewMP4Record\NewMP4Record\Debug\vc110.pdb
     文件        4931  2019-08-24 10:20  NewMP4Record\NewMP4Record\HeadInfo.h
     文件        6794  2019-08-24 10:20  NewMP4Record\NewMP4Record\MP4Record.cpp
     文件        1294  2019-08-24 10:19  NewMP4Record\NewMP4Record\MP4Record.h
     文件        4552  2019-08-24 10:20  NewMP4Record\NewMP4Record\NewMP4Record.vcxproj
     文件        1247  2019-08-24 10:20  NewMP4Record\NewMP4Record\NewMP4Record.vcxproj.filters
     目录           0  2019-08-24 11:12  NewMP4Record\NewMP4Record\include\
     文件        7976  2015-02-13 01:38  NewMP4Record\NewMP4Record\include\_mingw.h
     文件        5721  2015-02-13 01:38  NewMP4Record\NewMP4Record\include\inttypes.h
     目录           0  2019-08-24 11:12  NewMP4Record\NewMP4Record\include\libavcodec\
............此处省略145个文件信息