在linux平台编译一个不依赖一堆编解码so文件的ffmpeg的步骤，这些步骤完全参考[官方文档](https://trac.ffmpeg.org/wiki/CompilationGuide/Centos?spm=a2c6h.12873639.0.0.2e5b54232tszep)如果不需要下面的某些库，就不用下载和编译它，并在在ffmepg的config的时候不要enable它。编译完了ldd ffmpeg查看，如果没有依赖那些库，说明就编译成功了，我使用的ffmepg的源码是4.3的版本

1、创建目录mkdir ~/ffmpeg_sources
2、安装NASM

cd ~/ffmpeg_sources
curl -O -L https://www.nasm.us/pub/nasm/releasebuilds/2.14.02/nasm-2.14.02.tar.bz2
tar xjvf nasm-2.14.02.tar.bz2
cd nasm-2.14.02
./autogen.sh
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin"
make
make install

3、安装Yasm

cd ~/ffmpeg_sources
curl -O -L https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
tar xzvf yasm-1.3.0.tar.gz
cd yasm-1.3.0
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin"
make
make install

4、安装libx264
H.264 video encoder. See the H.264 Encoding Guide for more information and usage examples.
Requires ffmpeg to be configured with --enable-gpl --enable-libx264.

cd ~/ffmpeg_sources
git clone --depth 1 https://code.videolan.org/videolan/x264.git
cd x264
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static
make
make install

Warning: If you get Found no assembler. Minimum version is nasm-2.13 or similar after running ./configure then the outdated nasm package from the repo is installed. Run yum remove nasm && hash -d nasm and x264 will then use your newly compiled nasm instead. Ensure environment is able to resolve path to nasm binary.
5、安装libx265
H.265/HEVC video encoder. See the H.265 Encoding Guide for more information and usage examples.
Requires ffmpeg to be configured with --enable-gpl --enable-libx265.

cd ~/ffmpeg_sources
hg clone https://bitbucket.org/multicoreware/x265
cd ~/ffmpeg_sources/x265/build/linux
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source
make
make install

上面提供的这个地址可能下载会失败，则可以从下面的地址下载(直接git或者下tar包)
https://github.com/videolan/x265
https://www.videolan.org/developers/x265.html
6、下载libfdk_aac
AAC audio encoder. See the AAC Audio Encoding Guide for more information and usage examples.
Requires ffmpeg to be configured with --enable-libfdk_aac (and --enable-nonfree if you also included --enable-gpl).

cd ~/ffmpeg_sources
git clone --depth 1 https://github.com/mstorsjo/fdk-aac
cd fdk-aac
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install

7、下载libmp3lame
MP3 audio encoder.
Requires ffmpeg to be configured with --enable-libmp3lame.

cd ~/ffmpeg_sources
curl -O -L https://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz
tar xzvf lame-3.100.tar.gz
cd lame-3.100
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm
make
make install

8、下载libopus
Opus audio decoder and encoder.
Requires ffmpeg to be configured with --enable-libopus.

cd ~/ffmpeg_sources
curl -O -L https://archive.mozilla.org/pub/opus/opus-1.3.1.tar.gz
tar xzvf opus-1.3.1.tar.gz
cd opus-1.3.1
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install

9、下载libvpx
VP8/VP9 video encoder and decoder. See the VP9 Video Encoding Guide for more information and usage examples.
Requires ffmpeg to be configured with --enable-libvpx.

cd ~/ffmpeg_sources
git clone --depth 1 https://chromium.googlesource.com/webm/libvpx.git
cd libvpx
./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-vp9-highbitdepth --as=yasm
make
make install

上面提供的这个地址可能下载会失败，则可以从下面的地址下载(直接git或者下tar包)
http://www.linuxfromscratch.org/blfs/view/svn/multimedia/libvpx.html
https://github.com/webmproject/libvpx

10、下载并编译ffmpeg

cd ~/ffmpeg_sources
curl -O -L https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
export PATH="$HOME/bin:$PATH" 
export PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" 
./configure \--prefix="$HOME/ffmpeg_build" \--pkg-config-flags="--static" \--extra-cflags="-I$HOME/ffmpeg_build/include" \--extra-ldflags="-L$HOME/ffmpeg_build/lib" \--extra-libs=-lpthread \--extra-libs=-lm \--bindir="$HOME/bin" \--enable-gpl \--enable-libfdk_aac \--enable-libfreetype \--enable-libmp3lame \--enable-libopus \--enable-libvpx \--enable-libx264 \--enable-libx265 \--enable-nonfree
make
make install
hash -d ffmpeg  //最后这一句不知道是干啥的，我没执行这个

1）configure提示找不到libfreetype，去掉命令行的–enable-libfreetype
2）再次configure，提示找不到opus，去刚才的opus目录，make uninstall删除安装，重新make，make install。
/特别注意************
注意上面命令行configure命令前面的那两行，
export PATH=“$HOME/bin:$PATH”
export PKG_CONFIG_PATH="KaTeX parse error: Expected 'EOF', got '#' at position 824: …lor_FFFFFF,t_70#̲pic_center) 一般是…{PATH}:/root/bin”
执行source /etc/profile，然后就可以再其他目录直接使用了