因为要用到improved dense trajectory特征，用源码需要编译ffmpeg和OpenCV，网址给出的源码需要的OpenCV-2.4.2 和ffmpeg-0.11.1都比较老，我用的是比较新的opencv2.4.12和ffmpeg-snapshot.tar.bz2 （2016-05-22）。

本文主要基于此官方指导编译

1. 安装依赖

 
 

  
  
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sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo zlib1g-dev
mkdir ~/ffmpeg_sources  //根目录下创建文件夹

2. Compilation & Installation

Yasm

  
  
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sudo apt-get install yasm

libx264

  
  
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 sudo apt-get install libx264-dev

libx265

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

libfdk-aac

  
  
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cd ~/ffmpeg_sources
wget -O fdk-aac.tar.gz https://github.com/mstorsjo/fdk-aac/tarball/master
tar xzvf fdk-aac.gz
cd mstorsjo-fdk-aac*
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
make distclean

libmp3lame

  
  
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 sudo apt-get install libmp3lame-dev

libopus

  
  
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 sudo apt-get install libopus-dev

libvpx

  
  
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 cd ~/ffmpeg_sources
wget http://storage.googleapis.com/downloads.webmproject.org/releases/webm/libvpx-1.5.0.tar.bz2
tar xjvf libvpx-.bz2
cd libvpx-.0
PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests
PATH="$HOME/bin:$PATH" make
make install
make clean

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 sudo apt-get install libavdevice-dev

ffmpeg

  
  
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cd ~/ffmpeg_sources
wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$HOME/bin:$PATH" 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"   --bindir="$HOME/bin"   --enable-gpl   --enable-libass   --enable-libfdk-aac   --enable-libfreetype   --enable-libmp3lame   --enable-libopus   --enable-libtheora   --enable-libvorbis   --enable-libvpx   --enable-libx264   --enable-libx265   --enable-nonfree PATH="$HOME/bin:$PATH" make
make install
make distclean
hash -r

到这里ffmpeg就编译安装结束了，编译过的ffmpeg在~/bin目录下

Usage

两种方法使用ffmpeg

• 进入~/bin文件夹，然后调用binary文件:cd ~/bin && ./ffmpeg -i ~/input.mp4 ~/videos/output.mkv
• 使用绝对路径：/home/yourusername/bin/ffmpeg -i ../input.mp4 ../videos/output.mkv

如果想要ffmpeg在所有地方都能直接调用，需要先注销，然后登陆。
或者执行source ~/.profile

Documentation

如果想要用man ffmpeg命令看文档，执行下面命令

echo "MANPATH_MAP $HOME/bin $HOME/ffmpeg_build/share/man" >> ~/.manpath

注销，然后登陆即可。

更新FFmpeg

  
  
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rm -rf ~/ffmpeg_build ~/ffmpeg_sources ~/bin/{ffmpeg,ffprobe,ffplay,ffserver,vsyasm,x264,x265,yasm,ytasm}

然后从头开始再来一次