Flash可以播放的Flv文件格式提取工具，可以提取音频文件，只允许FLV文件中的音频文件为MP3格式。-Flash can play the Flv file format extraction tool to extract audio files and allow only FLV files to MP3 format audio files.

Very convenient to use, Is a good learning materials to learn PCA feature extraction, Matlab to achieve user-friendly.