多媒体大作业1、抽取MPEG文件的关键帧

2、用JPG解码算法还原为BMP

3、可以指定任意一个时刻（精确到秒）的若干关键帧，输入时间，获得该时间点一秒内的所有I帧

4、实现MPEG-1

5、若有能力实现MPEG-4，分数加15分

6、将该算法用C++实现，制作成DLL，可供其他程序方便快捷调用，加10分

-Multimedia big job 1, MPEG file to extract key frame 2, reduced to BMP 3 with JPG decoding algorithm, you can specify any one time (accurate to second) of a number of key frames, enter the time, I get all the time within one second frame 4, to achieve MPEG-1 5, if the ability to achieve MPEG-4, scores 15 points plus 6, the algorithms C++ achieve, made into a DLL, convenient and calls for other programs, plus 10 points