最近由于工作需要，需要对音频视频做转码、切割、抽帧处理，特写此博客，以作备忘。
大致步骤如下：
1、作为音视频处理工具、ffmpeg很强大
2、首先要在linux或者windows系统上安装ffmpeg(百度一下安装步骤)
3、按照我写的工具类，设置好安装路径即可使用
下面分享部分代码，大致如下
一、音频文件转wav格式
/**
* 音频文件转wav格式
* @param ffmpegPath
* @param sourcePath
* @param targetPath
* @return
* @throws Exception
*/
public static File changeFileToWav(String ffmpegPath ,String sourcePath, String targetPath) throws Exception {
String webroot = ffmpegPath;
Runtime run = null;
try {
run = Runtime.getRuntime();
long start = System.currentTimeMillis();
System.out.println(new File(webroot).getAbsolutePath());
//执行ffmpeg.exe,前面是ffmpeg.exe的地址，中间是需要转换的文件地址，后面是转换后的文件地址。-i是转换方式，意思是可编码解码，mp3编码方式采用的是libmp3lame
//wav转pcm
//Process p=run.exec(new File(webroot).getAbsolutePath()+"/ffmpeg -y -i "+sourcePath+" -acodec pcm_s16le -f s16le -ac 1 -ar 16000 "+targetPath);
//mp3转pcm
// Process p = run.exec(new File(webroot).getAbsolutePath() + "/ffmpeg -y -i " + sourcePath + " -acodec pcm_s16le -f s16le -ac 1 -ar 16000 " + targetPath);
//16bit 单声道 48khz
Process p = run.exec(new File(webroot).getAbsolutePath() + "/ffmpeg -y -i " + sourcePath + " -ar 48000 -ac 1 -acodec pcm_s16le " + targetPath);
InputStream stderr = p.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;while ((line = br.readLine()) != null)
System.out.println(line);int exitVal = p.waitFor();
System.out.println("Process exitValue: " + exitVal);//释放进程
p.getOutputStream().close();
p.getInputStream().close();
p.getErrorStream().close();
p.waitFor();
long end = System.currentTimeMillis();
System.out.println(sourcePath + " convert success, costs:" + (end - start) + "ms");
File targetFile = new File(targetPath);
return targetFile;
} catch (Exception e) {
e.printStackTrace();
} finally {
//run调用lame解码器最后释放内存
run.freeMemory();
}
return null;
}
二、音频切割
/**
* 音频切割
* @param ffmpegPath
* @param sourcePath
* @param targetPath
* @param startTime
* @param endTime
* @return
* @throws Exception
*/
public static File wavToCutting(String ffmpegPath ,String sourcePath, String targetPath,String startTime,String endTime) throws Exception {
String webroot = ffmpegPath;
Runtime run = null;
try {
run = Runtime.getRuntime();
long start = System.currentTimeMillis();
System.out.println(new File(webroot).getAbsolutePath());
//执行ffmpeg.exe,前面是ffmpeg.exe的地址，中间是需要转换的文件地址，后面是转换后的文件地址。-i是转换方式，意思是可编码解码，mp3编码方式采用的是libmp3lame
//wav转pcm
//Process p=run.exec(new File(webroot).getAbsolutePath()+"/ffmpeg -y -i "+sourcePath+" -acodec pcm_s16le -f s16le -ac 1 -ar 16000 "+targetPath);
//mp3转pcm
// Process p = run.exec(new File(webroot).getAbsolutePath() + "/ffmpeg -y -i " + sourcePath + " -acodec pcm_s16le -f s16le -ac 1 -ar 16000 " + targetPath);
//16bit 单声道 48khz
System.err.print(new File(webroot).getAbsolutePath() + "/ffmpeg -i " + sourcePath + " -ss "+startTime+" -to "+endTime +" -y "+ targetPath);
Process p = run.exec(new File(webroot).getAbsolutePath() + "/ffmpeg -i " + sourcePath + " -ss "+startTime+" -to "+endTime +" -y "+ targetPath);
InputStream stderr = p.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;while ((line = br.readLine()) != null)
System.out.println(line);int exitVal = p.waitFor();
System.out.println("Process exitValue: " + exitVal);//释放进程
p.getOutputStream().close();
p.getInputStream().close();
p.getErrorStream().close();
p.waitFor();
long end = System.currentTimeMillis();
System.out.println(sourcePath + " convert success, costs:" + (end - start) + "ms");
File targetFile = new File(targetPath);
return targetFile;
} catch (Exception e) {
e.printStackTrace();
} finally {
//run调用lame解码器最后释放内存
run.freeMemory();
}
return null;
}