由于最近在做ios与android端需要做amr至mp3的转换，在网上搜了下资料，基本都是用ffmpeg做音视频类转换
2.ffmpeg下载安装
2.1、下载ffmpeg。
下载网址： http://www.ffmpeg.org/download.html
2.2、解压缩
tar -zxvf ffmpeg-2.0.1.tar.gz
2.3、编辑profile文件：
vi /etc/profile
在文件末尾加上两句话：
export FFMPEG_HOME=/usr/local/ffmpeg
export PATH=$FFMPEG_HOME/bin:$PATH
2.4、配置安装路径之类的：
./configure --enable-shared --prefix=/usr/local/ffmpeg
--enable-shared 参数据说是允许其编译产生动态库，在以后的编程中要用到这个几个动态库，我也没考证，就直接用了。
如果出现异常，提示因为缺少yasm，需要添加参数，再执行以下命令：
./configure --enable-shared --disable-yasm --prefix=/usr/local/ffmpeg
如果执行结果不对，可以根据提示信息，并查看帮助，解决问题
./configure --help
2.5、编译安装
make
make install
2.6、安装之后在/usr/local/ffmpeg会看到有三个目录
bin 执行文件目录
lib 静态，动态链接库目录
include 编程用到的头文件
2.7、为了防止执行程序找不到库文件，
可以将/usr/local/ffmpeg/lib目录设置到LD_LIBRARY_PATH环境变量
8、若出现error while loading shared libraries: libavdevice.so.52的错误
修改/etc/ld.so.conf 在最后一行加上/usr/local/ffmpeg/lib
ldconfig -v
并修改 /usr/local/ffmpeg/lib目录下的文件权限为777
3.shell脚本命令转换
./ffmpeg -i source.amr dest.mp3
4.ffmpeg自带转换
/**
* useFfmpegToMp3
*
* @param ffmpeg
* @param source
* @param target
*/
public static void useFfmpegToMp3(String ffmpeg, String source, String target){
Runtime run = null;
try {
long start=System.currentTimeMillis();
run = Runtime.getRuntime();
//设置文件运行权限
run.exec(new String[] { "/bin/chmod", "755", ffmpeg});
String runCmd = ffmpeg + " -i " + source + " " + target;
//运行命令
Process proc = run.exec(runCmd);
proc.getOutputStream().flush();
proc.getOutputStream().close();
proc.getInputStream().close();
LOGGER.info("Dest File Size:{}", new File(target).length());
long end=System.currentTimeMillis();
LOGGER.info("useFfmpegToMp3 Complete:{} -> {}, cost ms:{}", source, target, end-start);
} catch (Exception e) {
LOGGER.error("useJaveToMp3 Exception: ", e);
} finally{
//run调用lame解码器最后释放内存
run.freeMemory();
}
}
5.Jave转换
下载地址: http://www.sauronsoftware.it/projects/jave/download.php
/**
* jave 转换mp3
*
* @param source
* @param target
*/
public static void useJaveToMp3(String source, String target) {
try {
long start=System.currentTimeMillis();
File sourceFile = new File(source);
File targetFile = new File(target);
AudioAttributes audio = new AudioAttributes();
Encoder encoder = new Encoder();
audio.setCodec("libmp3lame");
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("mp3");
attrs.setAudioAttributes(audio);
encoder.encode(sourceFile, targetFile, attrs);
LOGGER.info("Dest File Size:{}", targetFile.length());
long end=System.currentTimeMillis();
LOGGER.info("useJaveToMp3 Complete:{} -> {}, cost ms:{}", source, target, end-start);
}catch (Exceptio){
LOGGER.error("useJaveToMp3 Exception: ", e);
}
}
备注:
如果自带的FFmpeg转码报错，编译最新的ffmpeg，执行就可以了
官方示例：
//From a generic AVI to a youtube-like FLV movie, with an embedded MP3 audio stream:
File source = new File("source.avi");
File target = new File("target.flv");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("libmp3lame");
audio.setBitRate(new Integer(64000));
audio.setChannels(new Integer(1));
audio.setSamplingRate(new Integer(22050));
VideoAttributes video = new VideoAttributes();
video.setCodec("flv");
video.setBitRate(new Integer(160000));
video.setFrameRate(new Integer(15));
video.setSize(new VideoSize(400, 300));
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("flv");
attrs.setAudioAttributes(audio);
attrs.setVideoAttributes(video);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);
//Next lines extracts audio informations from an AVI and store them in a plain WAV file:
File source = new File("source.avi");
File target = new File("target.wav");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("pcm_s16le");
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("wav");
attrs.setAudioAttributes(audio);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);
// Next example takes an audio WAV file and generates a 128 kbit/s, stereo, 44100 Hz MP3 file:
File source = new File("source.wav");
File target = new File("target.mp3");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("libmp3lame");
audio.setBitRate(new Integer(128000));
audio.setChannels(new Integer(2));
audio.setSamplingRate(new Integer(44100));
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("mp3");
attrs.setAudioAttributes(audio);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);
// Next one decodes a generic AVI file and creates another one with the same video stream of the source and a re-encoded low quality MP3 audio stream:
File source = new File("source.avi");
File target = new File("target.avi");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("libmp3lame");
audio.setBitRate(new Integer(56000));
audio.setChannels(new Integer(1));
audio.setSamplingRate(new Integer(22050));
VideoAttributes video = new VideoAttributes();
video.setCodec(VideoAttributes.DIRECT_STREAM_COPY);
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("avi");
attrs.setAudioAttributes(audio);
attrs.setVideoAttributes(video);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);
//Next one generates an AVI with MPEG 4/DivX video and OGG Vorbis audio:
File source = new File("source.avi");
File target = new File("target.avi");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("libvorbis");
VideoAttributes video = new VideoAttributes();
video.setCodec("mpeg4");
video.setTag("DIVX");
video.setBitRate(new Integer(160000));
video.setFrameRate(new Integer(30));
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("mpegvideo");
attrs.setAudioAttributes(audio);
attrs.setVideoAttributes(video);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);
// A smartphone suitable video:
File source = new File("source.avi");
File target = new File("target.3gp");
AudioAttributes audio = new AudioAttributes();
audio.setCodec("libfaac");
audio.setBitRate(new Integer(128000));
audio.setSamplingRate(new Integer(44100));
audio.setChannels(new Integer(2));
VideoAttributes video = new VideoAttributes();
video.setCodec("mpeg4");
video.setBitRate(new Integer(160000));
video.setFrameRate(new Integer(15));
video.setSize(new VideoSize(176, 144));
EncodingAttributes attrs = new EncodingAttributes();
attrs.setFormat("3gp");
attrs.setAudioAttributes(audio);
attrs.setVideoAttributes(video);
Encoder encoder = new Encoder();
encoder.encode(source, target, attrs);