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作者：EasyWave                                                                             时间：2014.10.31

类别：Linux应用-MP4视频录制库MP4V2移植心得和简单介绍            声明：转载。请保留链接

注意：如有错误，欢迎指正。

这些是我学习的日志文章......

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一：MP4V2库简单介绍

      MP4V2的前身是MPEG4IP开源项目中的一个功能库，可是如今MPEG4IP已经不在更新了。可是MP4V2还在更新，而且独立出来了。MP4V2主要是作为MP4文件的录制一个开源库。例如以下所看到的：

         MPEG4IP提供一个端对端的系统来实现音视频流的传输。支持包含MPEG4/H.261/MPEG2/H.263 MP3/AAC/AMR等不同编码格式。如今关于Google相关的code.google.com已经无法打开了，因此仅仅好提供以下的下载地址。例如以下所看到的：

二：MP4V2的编译

      在Linux下编译MP4V2，首先须要配置哪些选项，我们能够通过configure来看看。运行./configure --help就能够了。例如以下所看到的：

/work/PRJ/mp4v2/mp4v2-2.0.0$ ./configure --help`configure' configures MP4v2 2.0.0 to adapt to many kinds of systems.Usage: ./configure [OPTION]... [VAR=VALUE]...To assign environment variables (e.g., CC, CFLAGS...), specify them asVAR=VALUE.  See below for descriptions of some of the useful variables.Defaults for the options are specified in brackets.Configuration:  -h, --help              display this help and exit      --help=short        display options specific to this package      --help=recursive    display the short help of all the included packages  -V, --version           display version information and exit  -q, --quiet, --silent   do not print `checking...' messages      --cache-file=FILE   cache test results in FILE [disabled]  -C, --config-cache      alias for `--cache-file=config.cache'  -n, --no-create         do not create output files      --srcdir=DIR        find the sources in DIR [configure dir or `..']Installation directories:  --prefix=PREFIX         install architecture-independent files in PREFIX                          [/usr/local]  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX                          [PREFIX]By default, `make install' will install all the files in`/usr/local/bin', `/usr/local/lib' etc.  You can specifyan installation prefix other than `/usr/local' using `--prefix',for instance `--prefix=$HOME'.For better control, use the options below.Fine tuning of the installation directories:  --bindir=DIR            user executables [EPREFIX/bin]  --sbindir=DIR           system admin executables [EPREFIX/sbin]  --libexecdir=DIR        program executables [EPREFIX/libexec]  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]  --libdir=DIR            object code libraries [EPREFIX/lib]  --includedir=DIR        C header files [PREFIX/include]  --oldincludedir=DIR     C header files for non-gcc [/usr/include]  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]  --infodir=DIR           info documentation [DATAROOTDIR/info]  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]  --mandir=DIR            man documentation [DATAROOTDIR/man]  --docdir=DIR            documentation root [DATAROOTDIR/doc/mp4v2]  --htmldir=DIR           html documentation [DOCDIR]  --dvidir=DIR            dvi documentation [DOCDIR]  --pdfdir=DIR            pdf documentation [DOCDIR]  --psdir=DIR             ps documentation [DOCDIR]Program names:  --program-prefix=PREFIX            prepend PREFIX to installed program names  --program-suffix=SUFFIX            append SUFFIX to installed program names  --program-transform-name=PROGRAM   run sed PROGRAM on installed program namesSystem types:  --build=BUILD     configure for building on BUILD [guessed]  --host=HOST       cross-compile to build programs to run on HOST [BUILD]Optional Features:  --disable-option-checking  ignore unrecognized --enable/--with options  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]  --disable-debug         disable debugging compilation  --disable-optimize      disable optimizing compilation  --disable-fvisibility   disable use of -fvisibility  --disable-gch           disable GCC precompiled-headers  --disable-largefile     disable LFS (large file support)  --disable-util          disable build of command-line utilities  --enable-bi=ARCH        enable -mARCH for bi-arch compilation  --enable-ub[=ARCHS]     enable -arch ARCH for universal-binaries (OSX only)  --enable-cygwin-win32   when building with Cygwin use -mwin32  --enable-mingw-threads  when building with MinGW use -mthreads  --disable-dependency-tracking  speeds up one-time build  --enable-dependency-tracking   do not reject slow dependency extractors  --enable-shared[=PKGS]  build shared libraries [default=yes]  --enable-static[=PKGS]  build static libraries [default=yes]  --enable-fast-install[=PKGS]                          optimize for fast installation [default=yes]  --disable-libtool-lock  avoid locking (might break parallel builds)Optional Packages:  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)  --with-pic              try to use only PIC/non-PIC objects [default=use                          both]  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]Some influential environment variables:  CXX         C++ compiler command  CXXFLAGS    C++ compiler flags  LDFLAGS     linker flags, e.g. -L
     
       if you have libraries in a              nonstandard directory 
      
         LIBS        libraries to pass to the linker, e.g. -l
       
          CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I
        
          if              you have headers in a nonstandard directory 
         
            CC          C compiler command  CFLAGS      C compiler flags  CPP         C preprocessor  CXXCPP      C++ preprocessorUse these variables to override the choices made by `configure' or to helpit to find libraries and programs with nonstandard names/locations.Report bugs to 
          
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         有太多的选项，应该怎么选呢。我这里提供了一个build.sh脚本，请按着里面的配置来做就好了。只是须要注意的是：--disable-optimize，假设使能--enable-optimize之后。mp4v2编译出来的库会少非常多，否则mp4v2库就会比較大一些，详细的取舍就看自己去认为啦，这里就不扯这个啦。build.sh脚本文件例如以下所看到的：

       仅仅要执行./build.sh脚本之后会自己主动去编译和安装，编译成功之后，会在_install文件夹中生成例如以下的文件夹。例如以下所看到的：

       看看lib文件夹下是否有mp4v2的库，例如以下所看到的：

       想要知道怎样使用这个库，能够參考util文件夹下的应用代码，例如以下所看到的：

      具体的应用就须要自己的去看啦，兴许会将其用到一个实际的项目其中去。这里就不具体介绍怎样使用啦。