ffmpeg是一个大项目，它包含各种音视频标准的codec，还支持各类file format（.avi, .mp4, .mkv and etc）的parsing。所以，很多开源项目都有直接或间接地采用了ffmpeg，-ffmpeg is a big project, which includes all the standard audio and video codec, also support a variety of file format (. avi,. then no time.

音频处理中合唱效果的实现，通过将输入信号分为两路，一路直接输入，一路延迟，最终叠加，实现合唱效果。-The effect of the realization of the audio processing in the chorus, the input signal is divided into two, all the way to direct input, all the way to delay final superposition chorus effect.