[book club issue 13] packaging format and coding format of audio files

FFmpeg Audio packaging format

MP3 It is one of the most common audio formats in our daily life , It is also an audio packaging format .
In daily life , We can often see *. mp3 The audio file for , It's like mp4、 flv The format of the video package is the same .

MP3 Package format

We can use the following command to view ffmpeg List of supported encapsulation formats :
ffmpeg- formats| XXX mp3

You can also use the following command to play a mp3 Music files :
Common mode :
ffplay XX.mp3
Oscillogram mode :
ffplay -showmode 1 XX.mp3
Spectrum pattern :
ffplay -showmode 2 XX.mp3

FFmpeg Audio coding format

FFmpeg Support many encoding formats , Include MP’3、 AAC、 AC3 etc. .
What we mainly study is MP3 Audio encoding format .

MP3 Coding format

MP3 It is also an audio coding format .
Different from video , Video encoding format , such as H264, - General assembly packaging MP4 perhaps FIV This encapsulation format is used . Audio encoding format MP3, Is encapsulated in the same name MP3 In the packaging format of . The two are easily confused , Pay attention to distinguish between .
We can use the following command to view ffmpeg List of supported encoding formats : .
ffmpeg- encoders| xxx mp3
Use the following command to view ffmpeg List of supported decoding formats :
ffmpeg- decoders| xxx mp3

MP3 File structure

summary ：

Through this issue , Learning to FFmpeg How to view audio and video media information , as well as MP3 Encapsulation and encoding formats . You can see it through your own practice FFmpeg Play a MP3 When you file , Different models , The default is spectrum mode .