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嵌入式Linux下MP4视频录制库MP4V2移植和简介
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作者：EasyWave 时间：2014.10.31
类别：Linux应用-MP4视频录制库MP4V2移植心得和简介 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库简介
MP4V2的前身是MPEG4IP开源项目中的一个功能库，但是现在MPEG4IP已经不在更新了。但是MP4V2还在更新，并且独立出来了。MP4V2主要是作为MP4文件的录制一个开源库，如下所示：
MPEG4IP提供一个端对端的系统来实现音视频流的传输，支持包括MPEG4/H.261/MPEG2/H.263 MP3/AAC/AMR等不同编码格式。现在关于Google相关的code.google.com已经无法打开了，因此只好提供下面的下载地址，如下所示：https://launchpad.net/ubuntu/+source/mp4v2
二：MP4V2的编译
在Linux下编译MP4V2，首先需要配置哪些选项，我们可以通过configure来看看，执行./configure --help就可以了，如下所示：
/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 as
VAR=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 specify
an 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 names
System 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<lib dir> if you have libraries in a
nonstandard directory <lib dir>
LIBS libraries to pass to the linker, e.g. -l<library>
CPPFLAGS (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
you have headers in a nonstandard directory <include dir>
CC C compiler command
CFLAGS C compiler flags
CPP C preprocessor
CXXCPP C++ preprocessor
Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.
Report bugs to <kidjan@gmail.com>.
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，不过需要注意的是：--disable-optimize，如果使能--enable-optimize之后，mp4v2编译出来的库会少很多，否则mp4v2库就会比较大一些，具体的取舍就看自己去觉得啦，这里就不扯这个啦。build.sh脚本文件如下所示：
只要运行./build.sh脚本之后会自动去编译和安装，编译成功之后，会在_install目录中生成如下的文件夹，如下所示：
看看lib目录下是否有mp4v2的库，如下所示：
想要知道如何使用这个库，可以参考util目录下的应用代码，如下所示：
具体的应用就需要自己的去看啦，后续会将其用到一个实际的项目当中去。这里就不详细介绍如何使用啦。
嵌入式Linux下MP4视频录制库MP4V2移植和简介
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