[book club issue 13] multimedia processing tool ffmpeg tool set

FFmpeg The development of

1. FFmpeg It is a multimedia open source project , We can use its project address : [github Address ](https://github. co/FFmpeg/FFmpeg) Go to download its source code to check .
2. FFmpeg It was first developed by French programmer Fabrice · Bella is 2000 Developed in , Up to now , The latest version is 5. 0.
3. FFmpeg It has been adopted by many open source projects .

FFmpeg The composition of

FFmpeg The project is divided into different modules according to their functions , Include AVFormat、 AVCodec. AVFilter、 AVDevice、AVUtil、swresample、 swscale.

1. AVFormat
   Package modules , It realizes most of the media packaging formats in the current multimedia field , Including encapsulation and unpacking , such as MP4、FLV、 MKV、 TS Wait for the file encapsulation format ,RTMP、RTSP、HLS And so on network protocol encapsulation format . in addition , It also supports custom packaging formats .
2. AVCodec
   Codec module , Among them, it has realized the vast majority of media encoding and decoding formats in the current multimedia field , Including encoding and decoding , such as MPEG4、 H264、 H265 Wait for video format ,AC、MP3 Wait for audio format . in addition , It also supports custom encoding and decoding formats .
3. AVFilter
   Filter module , It realizes the current general audio 、 video 、 Subtitle and other filter processing frame .
4. AVDevice
   Device management module , Including audio equipment and video equipment .
5. AVUtil
   Tool module .
6. swresample
   Audio conversion module , Including audio resampling 、 Channel number adjustment, etc .
7. swscale
   Video image conversion module , Including image scaling 、 Pixel format conversion .

FFmpeg The toolset of

1. ffmpeg yes FFmpeg Codec tools in the tool set .
2. ffplay yes FFmpeg Player in toolset .
3. ffprobe yes FFmpeg Multimedia analysis tools in the toolset .

summary ：

Through the first day of study , Have a brief understanding of FFmpeg The development of this open source project 、 Composition and toolset , Marvel at this one 20 A project invented years ago , It already has so many functions , Looking forward to the follow-up study and the effect of practice ！