* Same problem with scons about the java binding : need to generate the
java files, reconfigure, and build again to generate class files and the
jar. Need to find a solution to skip the reconfigure...
* Useful flags to configure using CMake:
     * CMAKE_BUILD_TYPE: Release / Debug
     * CMAKE_INSTALL_PREFIX: /path/to/install
     * FFMPEG_INCLUDE_DIR
     * FFMPEG_LIBRARY_DIR
* Name of output librairies:
     * avtranscoder.a
     * avtranscoder.so (link + .so with version)
     * avtranscoder-py.so (without link)
     * avtranscoder-java.so (without link)

* Add a CMakeList.txt for each app.

Do not need to reconfigure the make file to be able to install
libraries.

* Do not need to reconfigure the make file to be able to generate class
files and jar file.
* The solution was to add a custom command as a post build of the java
binding which generate java files.

Check if FFmpeg or libav dependency, and define variable to manage
includes in source code.

* Custom utilities are:
     * AvTranscoderMacros.cmake: macros, included in all cmake files.
     * FindFFmpeg.cmake: to get FFmpeg package (by specify a list of
components, check the FFmpeg version, get FFmpeg from command line if
there are parameters, etc...).

* Update FindFFmpeg.cmake : do not raise error if a component is not
found (warning).

* If REQUIRED is specified for modules, raise error if a module is not
found.

* No need to specified the jdk version (it could be different on an
other computer).
* Use the JAVA_HOME environment variable to get the jdk (make sure your
env. is correctly set).

* Library linked by target "avplay".

…into build_CMake

* Define preprocessor macros:
     * AVTRANSCODER_VERSION_MAJOR.
     * AVTRANSCODER_VERSION_MINOR.
     * AVTRANSCODER_VERSION_MICRO.
* In CMake AVTRANSCODER_VERSION is available.

* Get javac executable from Java_JAVAC_EXECUTABLE.
* Get jar executable from Java_JAR_EXECUTABLE.

It could be g++, clang, msvc...

* Permissions are:
     * owner: read / writer / execute.
     * group: read / execute.
     * all: read / execute.

* Rename xxx.man to xxx.1 (manuals for users).

Rename avtranscoder-jar.jar to avtranscoder.jar.

Versioning in three steps:
     * libavtranscoder.so -> libavtranscoder.so.0
     * libavtranscoder.so.0 -> libavtranscoder.so.0.2.1
     * libavtranscoder.so.0.2.1

* Generate python binding if PYTHONLIBS_FOUND.
* Generate java binding if JAVA_FOUND AND JNI_FOUND.
* So theses packages are not required to build AvTranscoder.

* If CMake 2.8.8, can get python version from PYTHONLIBS_VERSION_STRING.
* Else, get python version from include path.