音频处理

mediainfo用来查看音频文件相关信息

$sudo apt-get install mediainfo

$~/Music$ mediainfo cfy.mp3
General
Complete name                            : cfy.mp3
Format                                   : MPEG Audio
File size                                : 4.03 MiB
Duration                                 : 4mn 22s
Overall bit rate mode                    : Constant
Overall bit rate                         : 128 Kbps
Album                                    : 曾经的歌系列 42
Track name                               : 尘封缘
Performer                                : 网络歌手
Recorded date                            : 2012-03-14
Writing library                          : LAME3.98.4
Copyright                                : QQ音乐
Cover                                    : Yes
Cover description                        : e
Cover type                               : Cover (front)
Cover MIME                               : image/jpeg
Tagging time                             : 2012-08-13T19:38:55

Audio
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Mode                                     : Joint stereo
Mode extension                           : MS Stereo
Duration                                 : 4mn 23s
Bit rate mode                            : Constant
Bit rate                                 : 128 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Compression mode                         : Lossy
Stream size                              : 4.01 MiB (100%)
Writing library                          : LAME3.98.4