我写的一个使用ffmpeg库来解压视频文件的程序，支持解压多种视频格式。-I wrote a library to use ffmpeg to extract the video files to support multiple video formats decompression.

使用ffmpeg解码MP3与AMR，详细介绍解码与编码的过程-Use ffmpeg decode MP3 and AMR, detailing the process of decoding and encoding

pcm音频数据编码成mp3文件，编码程序写成了接口，方便调用，参考tests目录下的使用demo(PCM audio data is encoded into a MP3 file, the code program is written as an interface, convenient to call, and refer to the use of demo under the tests directory)