centos安装ffmpeg添加ogg音频(ffmpeg音频编码)支持操作步骤
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FFmpeg是一个自由软件，可以运行音频和视频多种格式的录影、转换、流功能，包含了libavcodec ─这是一个用于多个项目中音频和视频的解码器库，以及libavformat——一个音频与视频格式转换库。（来自维基百科）</p>
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安装前提</p>
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由于在centos下使用 yum install ffmpeg 是找不到安装包的，所以需要通过其他方法来安装：</p>
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一、安装ffmpeg</p>
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操作系统：centos 5.6</p>
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(一)安装编译环境</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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#yum install -y automake autoconf libtool gcc gcc-c++ </div>
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(二)安装所需程序库的RPM包到 centos(因为centos自带的库中没有ffmpeg包，这里相当于是扩展)</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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#rpm -Uhv <a href="http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm">http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm</a> </div>
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(三)安装 Install ffmpeg 等模块</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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yum -y install ffmpeg ffmpeg-devel</div>
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当然你也可以选择编译源码安装，只需要在安装之前，将 ffmpeg 需要的支持库安装好就是了，我之所以选择这种安装方式就是不想再去逐个编译各种库。</p>
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安装好之后可以使用下面命令查看：</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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./configure --prefix=/usr</div>
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安装好之后，你的机器就添加了对 ogg 音频的支持。这里你需要先安装 libogg，因为 libvorbis 需要 libogg 的支持。</p>
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重新编译 ffmpeg</p>
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接下来就需要重新编译安装一下 ffmpeg ， 这时候你需要去下载一个 ffmpeg 的源码包</p>
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运行</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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ffmpeg</div>
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拷贝如下信息<br>
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<span><u>复制代码</u></span>
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代码如下:</div>
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configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab</div>
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当然你可以将不需要的移除，</p>
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在 ffmpeg 源码目录下运行</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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./configure --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab --enable-libvorbis</div>
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最后的一项是 --enable-libvorbis ，这个就是加入 ogg 的音频支持。<br>
编译完成之后 ，运行</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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make && make install</div>
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就完成 ffmpeg 的安装了</p>
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简单测试</p>
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可以使用如下命令测试 amr 到 ogg 的转码：</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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ffmpeg -i xxx.amr -f ogg -acodec libvorbis -ac 2 -ab 128k -ar 44100 xxx.ogg</div>
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可以使用如下命令测试 amr 到 mp3 的转码：<br>
</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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ffmpeg -i xxx.amr xxx.mp3</div>
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可见 ffmpeg 对 mp3 的支持还是好很多的。</p>
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转码成功可以看到类似下面的输出：<br><br><img style="max-width:100%!important;height:auto!important;"title="centos安装ffmpeg添加ogg音频(ffmpeg音频编码)支持操作步骤" alt="centos安装ffmpeg添加ogg音频(ffmpeg音频编码)支持操作步骤" id="theimg" src="https://zhuji.jb51.net/uploads/img/202305/9cf293b8e3ca1b76fba7030c48cb895b.jpg"></p>
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