/*** 获取视频文件的时长* @param ffmpegPath 是ffmpeg软件存放的目录，sourceFile是目标文件* @return*/public String duration(String ffmpegPath,String sourceFile){List<String> duration = new ArrayList<String>();String ffmpegroot = ffmpegPath+"/ffmpeg";duration.add(ffmpegroot);duration.add("-i");duration.add(sourceFile);ProcessBuilder pb = new ProcessBuilder();pb.command(duration);pb.redirectErrorStream(true);InputStream is = null;BufferedReader br = null;try {Process p = pb.start();is = p.getInputStream();StringBuffer outS = new StringBuffer("");br = new BufferedReader(new InputStreamReader(is, "UTF-8"));String line = br.readLine();while(line!=null){outS.append(line);line = br.readLine();}String out = outS.toString();int index = out.indexOf("Duration:");int end = out.indexOf(",", index);if(index>=0){String result = out.substring(index+10, end);return result;}} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}finally{try {br.close();is.close();} catch (IOException e) {e.printStackTrace();}}return null;}

音频的原时长:00:00:25.60

 //参数格式:"00:00:10.68"  public float getTimelen(String timelen){ float min=0.0f;  String strs[] = timelen.split(":");  if (strs[0].compareTo("0") > 0) {  min+=Integer.valueOf(strs[0])*60*60;//秒
        }  if(strs[1].compareTo("0")>0){  min+=Integer.valueOf(strs[1])*60;  }  if(strs[2].compareTo("0")>0){  min+=Float.valueOf(strs[2]);  }  return min;  } 

/*** 截取音频的  从front-duration秒* @param ffmpegPath ffmpeg程序的路径* @param sourcePath 源文件* @param targetPath 需要生成的文件* @param front      从多少秒开始截取* @param duration   一共截取多长时间* @throws Exception*/public static void wavCut(String ffmpegPath,String sourcePath, String targetPath,double front,double duration) throws Exception {  List<String> wavToPcm = new ArrayList<String>();wavToPcm.add(ffmpegPath+"/ffmpeg");wavToPcm.add("-i");wavToPcm.add(sourcePath);wavToPcm.add("-ss");wavToPcm.add("00:00:0"+front);wavToPcm.add("-t");wavToPcm.add(duration+"");wavToPcm.add("-y");wavToPcm.add(targetPath);ProcessBuilder builder = new ProcessBuilder();builder.command(wavToPcm);for(String str:wavToPcm){System.out.print(str+" ");}System.out.println();builder.redirectErrorStream(true);try {Process process=builder.start();int a=process.waitFor();} catch (IOException e) {e.printStackTrace();} catch(InterruptedException ie){ie.printStackTrace();}}

ffmpeg截取一段视频中一段视频ffmpeg  -i ./plutopr.mp4 -vcodec copy -acodec copy -ss 00:00:10 -to 00:00:15 ./cutout1.mp4 -y-ss time_off        set the start time offset 设置从视频的哪个时间点开始截取，上文从视频的第10s开始截取
-to 截到视频的哪个时间点结束。上文到视频的第15s结束。截出的视频共5s.
如果用-t 表示截取多长的时间如 上文-to 换位-t则是截取从视频的第10s开始，截取15s时长的视频。即截出来的视频共15s.注意的地方是：如果将-ss放在-i ./plutopr.mp4后面则-to的作用就没了，跟-t一样的效果了，变成了截取多长视频。一定要注意-ss的位置。参数解析
-vcodec copy表示使用跟原视频一样的视频编解码器。
-acodec copy表示使用跟原视频一样的音频编解码器。-i 表示源视频文件
-y 表示如果输出文件已存在则覆盖。
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public static void changeWavToRightWav(String ffmpegPath,String sourcePath, String targetPath) throws Exception {  List<String> wavToWav = new ArrayList<String>();wavToWav.add(ffmpegPath+"/ffmpeg");wavToWav.add("-i");wavToWav.add(sourcePath);wavToWav.add("-ar");wavToWav.add("8000");wavToWav.add("-ac");wavToWav.add("1");wavToWav.add("-acodec");wavToWav.add("pcm_alaw");wavToWav.add("-y");wavToWav.add(targetPath);ProcessBuilder builder = new ProcessBuilder();builder.command(wavToWav);builder.redirectErrorStream(true);final Process process=builder.start();//处理InputStream的线程new Thread(){@Overridepublic void run(){BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream())); String line = null;try {while((line = in.readLine()) != null){System.out.println("output: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {in.close();} catch (IOException e) {e.printStackTrace();}}}}.start();new Thread(){@Overridepublic void run(){BufferedReader err = new BufferedReader(new InputStreamReader(process.getErrorStream())); String line = null;try {while((line = err.readLine()) != null){System.out.println("err: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {err.close();} catch (IOException e) {e.printStackTrace();}}}}.start();int a=process.waitFor();}

public static void changeAmrToWav(String ffmpegPath,String sourcePath, String targetPath) throws Exception {  List<String> wavToPcm = new ArrayList<String>();wavToPcm.add(ffmpegPath+"/ffmpeg");wavToPcm.add("-y");wavToPcm.add("-i");wavToPcm.add(sourcePath);wavToPcm.add("-acodec");wavToPcm.add("pcm_alaw");wavToPcm.add(targetPath);ProcessBuilder builder = new ProcessBuilder();builder.command(wavToPcm);builder.redirectErrorStream(true);final Process process=builder.start();//处理InputStream的线程new Thread(){@Overridepublic void run(){BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream())); String line = null;try {while((line = in.readLine()) != null){System.out.println("output: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {in.close();} catch (IOException e) {e.printStackTrace();}}}}.start();new Thread(){@Overridepublic void run(){BufferedReader err = new BufferedReader(new InputStreamReader(process.getErrorStream())); String line = null;try {while((line = err.readLine()) != null){System.out.println("err: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {err.close();} catch (IOException e) {e.printStackTrace();}}}}.start();int a=process.waitFor();}

/*** 得到amr的时长* * @param file* @return* @throws IOException*/public static long getAmrDuration(File file) throws IOException {long duration = -1;int[] packedSize = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };RandomAccessFile randomAccessFile = null;try {randomAccessFile = new RandomAccessFile(file, "rw");long length = file.length();//文件的长度int pos = 6;//设置初始位置int frameCount = 0;//初始帧数int packedPos = -1;/byte[] datas = new byte[1];//初始数据值while (pos <= length) {randomAccessFile.seek(pos);if (randomAccessFile.read(datas, 0, 1) != 1) {duration = length > 0 ? ((length - 6) / 650) : 0;break;}packedPos = (datas[0] >> 3) & 0x0F;pos += packedSize[packedPos] + 1;frameCount++;}/duration += frameCount * 20;//帧数*20} finally {if (randomAccessFile != null) {randomAccessFile.close();}}return duration;}

/*** 功能：获取音频速率* @param file* @return* @throws Exception*/public static Integer getWavRate(File file) throws Exception{FileInputStream fis = new FileInputStream(file);BufferedInputStream buffer = new BufferedInputStream(fis);AudioInputStream ain = AudioSystem.getAudioInputStream(buffer);AudioFormat format=ain.getFormat();Float frameRate = format.getFrameRate();return frameRate!=null?frameRate.intValue():0;}

public static void changeWavToPcm(String ffmpegPath,String sourcePath, String targetPath) throws Exception {  List<String> wavToPcm = new ArrayList<String>();wavToPcm.add(ffmpegPath+"/ffmpeg");wavToPcm.add("-y");wavToPcm.add("-i");wavToPcm.add(sourcePath);wavToPcm.add("-acodec");wavToPcm.add("pcm_s16le");wavToPcm.add("-f");wavToPcm.add("s16le"); wavToPcm.add("-ac"); wavToPcm.add("1"); wavToPcm.add("-ar"); wavToPcm.add("8000"); wavToPcm.add(targetPath);ProcessBuilder builder = new ProcessBuilder();builder.command(wavToPcm);builder.redirectErrorStream(true);final Process process=builder.start();//处理InputStream的线程new Thread(){@Overridepublic void run(){BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream())); String line = null;try {while((line = in.readLine()) != null){System.out.println("output: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {in.close();} catch (IOException e) {e.printStackTrace();}}}}.start();new Thread(){@Overridepublic void run(){BufferedReader err = new BufferedReader(new InputStreamReader(process.getErrorStream())); String line = null;try {while((line = err.readLine()) != null){System.out.println("err: " + line);}} catch (IOException e) {                        e.printStackTrace();}finally{try {err.close();} catch (IOException e) {e.printStackTrace();}}}}.start();process.waitFor();}

package com.lzh.utils;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;/*** * @Description: 获取视频的信息*/
public class FetchVideoCover {// 视频路径private String ffmpegEXE;public void getCover(String videoInputPath, String coverOutputPath) throws IOException, InterruptedException {
//        ffmpeg.exe -ss 00:00:01 -i spring.mp4 -vframes 1 bb.jpgList<String> command = new java.util.ArrayList<String>();command.add(ffmpegEXE);// 指定截取第1秒command.add("-ss");command.add("00:00:01");command.add("-y");command.add("-i");command.add(videoInputPath);command.add("-vframes");command.add("1");command.add(coverOutputPath);for (String c : command) {System.out.print(c + " ");}ProcessBuilder builder = new ProcessBuilder(command);Process process = builder.start();InputStream errorStream = process.getErrorStream();InputStreamReader inputStreamReader = new InputStreamReader(errorStream);BufferedReader br = new BufferedReader(inputStreamReader);String line = "";while ( (line = br.readLine()) != null ) {}if (br != null) {br.close();}if (inputStreamReader != null) {inputStreamReader.close();}if (errorStream != null) {errorStream.close();}}public String getFfmpegEXE() {return ffmpegEXE;}public void setFfmpegEXE(String ffmpegEXE) {this.ffmpegEXE = ffmpegEXE;}public FetchVideoCover() {super();}public FetchVideoCover(String ffmpegEXE) {this.ffmpegEXE = ffmpegEXE;}public static void main(String[] args) {// 获取视频信息。FetchVideoCover videoInfo = new FetchVideoCover("c:\\ffmpeg\\bin\\ffmpeg.exe");try {videoInfo.getCover("c:\\北京北京.avi","c:\\北京.jpg");} catch (Exception e) {e.printStackTrace();}}
}

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package com.lzh.utils;import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;public class MergeVideoMp3 {private String ffmpegEXE;public MergeVideoMp3(String ffmpegEXE) {super();this.ffmpegEXE = ffmpegEXE;}public void convertor(String videoInputPath, String mp3InputPath,double seconds, String videoOutputPath) throws Exception {
//        ffmpeg.exe -i 苏州大裤衩.mp4 -i bgm.mp3 -t 7 -y 新的视频.mp4List<String> command = new ArrayList<>();command.add(ffmpegEXE);command.add("-i");command.add(videoInputPath);command.add("-i");command.add(mp3InputPath);command.add("-t");command.add(String.valueOf(seconds));command.add("-y");command.add(videoOutputPath);for (String c : command) {System.out.print(c + " ");}ProcessBuilder builder = new ProcessBuilder(command);Process process = builder.start();InputStream errorStream = process.getErrorStream();InputStreamReader inputStreamReader = new InputStreamReader(errorStream);BufferedReader br = new BufferedReader(inputStreamReader);String line = "";while ( (line = br.readLine()) != null ) {}if (br != null) {br.close();}if (inputStreamReader != null) {inputStreamReader.close();}if (errorStream != null) {errorStream.close();}}public static void main(String[] args) {MergeVideoMp3 ffmpeg = new MergeVideoMp3("C:\\ffmpeg\\bin\\ffmpeg.exe");try {ffmpeg.convertor("C:\\苏州大裤衩.mp4", "C:\\music.mp3", 7.1, "C:\\这是通过java生产的视频.mp4");} catch (Exception e) {e.printStackTrace();}}}

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