[Yunxiang book club issue 13] packaging format of video files

The suffix of video is also called the encapsulation format of video , Video format for short .
encapsulation ：  Suffix name （ Package format / File format ）. The so-called encapsulation is the multimedia file generated by the encoder , Video frequency , Audio , Subtitles are mixed and packaged according to certain standards .
Containers ：  Provide index for multimedia content . If there is no container, you can only see the end of a video from the beginning , No sound . Container standards are developed by different companies , Some are compatible , Some of them need to change the encoding format of the media before they can be converted , Generally, the selection efficiency is high , Container standards with good compatibility .

code ： It's actually compression , Is similar to the zip/rar. To reduce the size of the file , Easy to transfer and store .
ffmpeg Support many encoding formats . If you want to view it, type ：ffmpeg -codecs（ View codec ）

Depending on the Frequency packaging formats generally include ：MP4,TS,MKV

Audio packaging formats generally include ：MP3,AAC,WMA

Network encapsulation formats generally include ：RTMP,RTSP,HLS

When MP4 in Box Of Data Is a series of sub Box when , The Box Called container .

moov The container contains File multimedia data information .