编译安装FFmpeg启用OpenSSL支持https下载

安装依赖：

sudo apt-get update -qq && sudo apt-get -y install \
  autoconf \
  automake \
  build-essential \
  cmake \
  git-core \
  libass-dev \
  libfreetype6-dev \
  libgnutls28-dev \
  libmp3lame-dev \
  libsdl2-dev \
  libtool \
  libva-dev \
  libvdpau-dev \
  libvorbis-dev \
  libxcb1-dev \
  libxcb-shm0-dev \
  libxcb-xfixes0-dev \
  meson \
  ninja-build \
  pkg-config \
  texinfo \
  wget \
  yasm \
  zlib1g-dev

Ubuntu 20.04还需要安装：

sudo apt install libunistring-dev libaom-dev libdav1d-dev

FFmpeg为提高编译效率，默认会使用汇编指令，如果没有安装nasm，会导致以下错误：

nasm/yasm not found or too old. Use --disable-x86asm for a crippled build.  

If you think configure made a mistake, make sure you are using the latest  
version from Git.  If the latest version fails, report the problem to the  
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.  
Include the log file ffbuild/config.log produced by configure as this will help  
solve the problem.

安装nasm：

sudo apt install nasm

或者也可以在编译时通过添加以下配置项禁用汇编指令编译：

--disable-x86asm

克隆FFmpeg：

git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg

进入源码目录：

cd ffmpeg

配置：

./configure --prefix=/usr/local/ffmpeg --enable-openssl

常用配置项还有：

--enable-gpl \
  --enable-gnutls \
  --enable-libaom \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libsvtav1 \
  --enable-libdav1d \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \

编译安装：

make && make install

添加环境变量：

vi /etc/profile

在末尾添加如下行：

export PATH=$PATH:/usr/local/ffmpeg/bin

载入环境变量：

source /etc/profile

更多信息请参考官方文档：Compile FFmpeg for Ubuntu, Debian, or Mint