php如何实现amr转成mp3

#yasm：汇编器，新版本的ffmpeg增加了汇编代码

wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz

tar -xzvf yasm-1.3.0.tar.gz

cd yasm-1.3.0

./configure

make

make install



#lame：Mp3音频解码

wget http://jaist.dl.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz

tar -xzvf lame-3.99.5.tar.gz

cd lame-3.99.5

./configure

make

make install



#amr支持

wget http://downloads.sourceforge.net/project/opencore-amr/opencore-amr/opencore-amr-0.1.3.tar.gz

tar -xzvf opencore-amr-0.1.3.tar.gz

cd opencore-amr-0.1.3

./configure

make

make install



#amrnb支持

wget http://www.penguin.cz/~utx/ftp/amr/amrnb-11.0.0.0.tar.bz2

tar -xjvf amrnb-11.0.0.0.tar.bz2

cd amrnb-11.0.0.0

./configure

make

make install



#amrwb支持

wget http://www.penguin.cz/~utx/ftp/amr/amrwb-11.0.0.0.tar.bz2

tar -xjvf amrwb-11.0.0.0.tar.bz2

cd amrwb-11.0.0.0

./configure

make

make install



#ffmpeg

wget http://ffmpeg.org/releases/ffmpeg-2.5.3.tar.bz2

tar -xjvf ffmpeg-2.5.3.tar.bz2

cd ffmpeg-2.5.3

./configure --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3 --enable-shared

make

make install



#加载配置

#最后写入config后，终端运行ffmpeg命令，出现success和已安装的扩展，则运行成功。

ldconfig

ldd `which ffmpeg`

        libavdevice.so.54 => not found

        libavfilter.so.3 => not found

        libavformat.so.54 => not found

        libavcodec.so.54 => not found

        libswresample.so.0 => not found

        libswscale.so.2 => not found

        libavutil.so.51 => not found

        libm.so.6 => /lib64/libm.so.6 (0x00002ab7c0eb6000)

        libpthread.so.0 => /lib64/libpthread.so.0 (0x00002ab7c100b000)

        libc.so.6 => /lib64/libc.so.6 (0x00002ab7c1125000)

        /lib64/ld-linux-x86-64.so.2 (0x00002ab7c0d9a000)

#如果类似于上面的输出内容，查找以上类库，会发现全部在/usr/local/lib/下

find /usr/local/lib/ | grep -E "libavdevice.so.54|libavfilter.so.3|libavcodec.so.54"

/usr/local/lib/libavfilter.so.3.17.100

/usr/local/lib/libavcodec.so.54.59.100

/usr/local/lib/libavdevice.so.54

/usr/local/lib/libavcodec.so.54

/usr/local/lib/libavfilter.so.3

/usr/local/lib/libavdevice.so.54.2.101



#查看链接库配置文件

more  /etc/ld.so.conf | grep /usr/local/lib

#如果不包含的话，需要编辑此文添加：

vi /etc/ld.so.conf

/usr/local/lib

/usr/local/lib64

#运行配置命令

ldconfig

$amr = './'.$vo['voice'];
$mp3 = $amr.'.mp3';

if(file_exists($mp3) == true){
    // exit('无需转换');
}else{
    $command = "/usr/local/bin/ffmpeg -i $amr $mp3";
    exec($command,$error);
}