实现H264编解码图像文件的源代码 实现算法：baseline profile ，含H.264算法参数设置(分辨率、帧率（I/P:15-20）等）和解码后的I帧-H264 codec to achieve an image file of the source code algorithm: baseline profile, including H.264 algorithm parameter settings (resolution, fr a me rate (I/P :15-20)