FFmpeg是什麼呢？

A complete, cross-platform solution to record, convert and stream audio and video.

一個完全的，跨平臺的記錄，轉換音視訊流的解決方案。

官網地址：

http://ffmpeg.org/

原始碼下載地址：

http://ffmpeg.org/download.html

本機作業系統：Ubuntu 14.04

下載完成之後解壓生成一個ffmpeg-4.0.1資料夾。

資料夾裡有一個INSTALL.md 安裝指導檔案，安裝三部曲：./configure;  make;  make install;

./configure --disable-x86asm

make

sudo make install

還有一個README.md 檔案，

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

## Libraries

* `libavcodec` provides implementation of a wider range of codecs.
* `libavformat` implements streaming protocols, container formats and basic I/O access.
* `libavutil` includes hashers, decompressors and miscellaneous utility functions.
* `libavfilter` provides a mean to alter decoded Audio and Video through chain of filters.
* `libavdevice` provides an abstraction to access capture and playback devices.
* `libswresample` implements audio mixing and resampling routines.
* `libswscale` implements color conversion and scaling routines.

## Tools

* [ffmpeg](https://ffmpeg.org/ffmpeg.html) is a command line toolbox to
  manipulate, convert and stream multimedia content.
* [ffplay](https://ffmpeg.org/ffplay.html) is a minimalistic multimedia player.
* [ffprobe](https://ffmpeg.org/ffprobe.html) is a simple analysis tool to inspect
  multimedia content.

* Additional small tools such as `aviocat`, `ismindex` and `qt-faststart`.

接下來的文章介紹是以官網http://ffmpeg.org/documentation.html為基礎，分為六大部分，

(1) Command Line Tools Documentation;

(2) Components Documentation;

(3) Libraries Documentation;

(4) General Documentation;

(5) Community Contributed Documentation