準備：

需要下載ffmpeg和mencoder，百度一搜就有了。請自行下載。

不墨跡，上代碼：

1）首先需要定義幾個量：Contants.java

public class Contants {public static final String ffmpegpath = "D:\\DevTools\\ffmpeg\\bin\\ffmpeg.exe";//ffmpeg的安裝位置public static final String mencoderpath = "D:\\DevTools\\mencoder\\"; // mencoder的目錄public static final String videofolder = "D:\\tools\\video\\"; // 需要被轉換格式的視頻目錄public static final String targetfolder = "D:\\tools\\target\\"; // 轉換后視頻的目錄public static final String videoRealPath = "D:\\tools\\target\\"; // 需要被截圖的視頻目錄;public static final String imageRealPath = "D:\\tools\\imgs\\"; // 截圖的存放目錄 }

2）其次，就是Utils類了,具體里面有注釋：ConverVideoUtils.java

import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.Date; import java.util.List;import com.wdy.common.Contants;public class ConverVideoUtils {private Date dt;private long begintime;private String sourceVideoPath;//源視頻路徑private String filerealname; // 文件名 不包括擴展名private String filename; // 包括擴展名private String videofolder = Contants.videofolder; // 別的格式視頻的目錄private String targetfolder = Contants.targetfolder; // flv視頻的目錄private String ffmpegpath = Contants.ffmpegpath; // ffmpeg.exe的目錄private String mencoderpath = Contants.mencoderpath; // mencoder的目錄private String imageRealPath = Contants.imageRealPath; // 截圖的存放目錄public ConverVideoUtils() {}public ConverVideoUtils(String path) {sourceVideoPath = path;}public String getPATH() {return sourceVideoPath;}public void setPATH(String path) {sourceVideoPath = path;}/*** 轉換視頻格式* @param String targetExtension 目標視頻擴展名 .xxx * @param isDelSourseFile 轉換完成后是否刪除源文件* @return*/public boolean beginConver(String targetExtension, boolean isDelSourseFile) {File fi = new File(sourceVideoPath);filename = fi.getName();filerealname = filename.substring(0, filename.lastIndexOf(".")).toLowerCase();System.out.println("----接收到文件(" + sourceVideoPath + ")需要轉換-------------------------- ");if (!checkfile(sourceVideoPath)) {System.out.println(sourceVideoPath + "文件不存在" + " ");return false;}dt = new Date();begintime = dt.getTime();System.out.println("----開始轉文件(" + sourceVideoPath + ")-------------------------- ");if (process(targetExtension,isDelSourseFile)) {Date dt2 = new Date();System.out.println("轉換成功 ");long endtime = dt2.getTime();long timecha = (endtime - begintime);String totaltime = sumTime(timecha);System.out.println("轉換視頻格式共用了:" + totaltime + " ");if (processImg(sourceVideoPath)) {System.out.println("截圖成功了！ ");} else {System.out.println("截圖失敗了！ ");}if (isDelSourseFile) {deleteFile(sourceVideoPath);}sourceVideoPath = null;return true;} else {sourceVideoPath = null;return false;}}/*** 對視頻進行截圖* @param sourceVideoPath 需要被截圖的視頻路徑（包含文件名和擴展名）* @return*/public boolean processImg(String sourceVideoPath) {if (!checkfile(sourceVideoPath)) {System.out.println(sourceVideoPath + " is not file");return false;}File fi = new File(sourceVideoPath);filename = fi.getName();filerealname = filename.substring(0, filename.lastIndexOf(".")).toLowerCase();List<String> commend = new java.util.ArrayList<String>();//第一幀： 00:00:01//time ffmpeg -ss 00:00:01 -i test1.flv -f image2 -y test1.jpgcommend.add(ffmpegpath); // commend.add("-i"); // commend.add(videoRealPath + filerealname + ".flv"); // commend.add("-y"); // commend.add("-f"); // commend.add("image2"); // commend.add("-ss"); // commend.add("38"); // commend.add("-t"); // commend.add("0.001"); // commend.add("-s"); // commend.add("320x240");commend.add("-ss");commend.add("00:00:01");commend.add("-i");commend.add(sourceVideoPath);commend.add("-f");commend.add("image2");commend.add("-y");commend.add(imageRealPath + filerealname + ".jpg");try {ProcessBuilder builder = new ProcessBuilder();builder.command(commend);builder.start();return true;} catch (Exception e) {e.printStackTrace();return false;}}/*** 實際轉換視頻格式的方法* @param targetExtension 目標視頻擴展名* @param isDelSourseFile 轉換完成后是否刪除源文件* @return*/private boolean process(String targetExtension, boolean isDelSourseFile) {int type = checkContentType();boolean status = false;if (type == 0) {//如果type為0用ffmpeg直接轉換status = processVideoFormat(sourceVideoPath,targetExtension, isDelSourseFile);} else if (type == 1) {//如果type為1，將其他文件先轉換為avi，然后在用ffmpeg轉換為指定格式String avifilepath = processAVI(type);if (avifilepath == null){// avi文件沒有得到return false;}else {System.out.println("開始轉換:");status = processVideoFormat(avifilepath,targetExtension, isDelSourseFile);}}return status;}/*** 檢查文件類型* @return*/private int checkContentType() {String type = sourceVideoPath.substring(sourceVideoPath.lastIndexOf(".") + 1, sourceVideoPath.length()).toLowerCase();// ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）if (type.equals("avi")) {return 0;} else if (type.equals("mpg")) {return 0;} else if (type.equals("wmv")) {return 0;} else if (type.equals("3gp")) {return 0;} else if (type.equals("mov")) {return 0;} else if (type.equals("mp4")) {return 0;} else if (type.equals("asf")) {return 0;} else if (type.equals("asx")) {return 0;} else if (type.equals("flv")) {return 0;}// 對ffmpeg無法解析的文件格式(wmv9，rm，rmvb等),// 可以先用別的工具（mencoder）轉換為avi(ffmpeg能解析的)格式.else if (type.equals("wmv9")) {return 1;} else if (type.equals("rm")) {return 1;} else if (type.equals("rmvb")) {return 1;}return 9;}/*** 檢查文件是否存在* @param path* @return*/private boolean checkfile(String path) {File file = new File(path);if (!file.isFile()) {return false;} else {return true;}}/*** 對ffmpeg無法解析的文件格式(wmv9，rm，rmvb等), 可以先用別的工具（mencoder）轉換為avi(ffmpeg能解析的)格式.* @param type* @return*/private String processAVI(int type) {List<String> commend = new java.util.ArrayList<String>();commend.add(mencoderpath);commend.add(sourceVideoPath);commend.add("-oac");commend.add("mp3lame");commend.add("-lameopts");commend.add("preset=64");commend.add("-ovc");commend.add("xvid");commend.add("-xvidencopts");commend.add("bitrate=600");commend.add("-of");commend.add("avi");commend.add("-o");commend.add(videofolder + filerealname + ".avi");// 命令類型：mencoder 1.rmvb -oac mp3lame -lameopts preset=64 -ovc xvid// -xvidencopts bitrate=600 -of avi -o rmvb.avitry {ProcessBuilder builder = new ProcessBuilder();builder.command(commend);Process p = builder.start();doWaitFor(p);return videofolder + filerealname + ".avi";} catch (Exception e) {e.printStackTrace();return null;}}/*** 轉換為指定格式* ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）* @param oldfilepath* @param targetExtension 目標格式擴展名 .xxx* @param isDelSourseFile 轉換完成后是否刪除源文件* @return*/private boolean processVideoFormat(String oldfilepath, String targetExtension, boolean isDelSourceFile) {if (!checkfile(sourceVideoPath)) {System.out.println(oldfilepath + " is not file");return false;}//ffmpeg -i FILE_NAME.flv -ar 22050 NEW_FILE_NAME.mp4List<String> commend = new java.util.ArrayList<>();commend.add(ffmpegpath);commend.add("-i");commend.add(oldfilepath);commend.add("-ar");commend.add("22050");commend.add(targetfolder + filerealname + targetExtension);try {ProcessBuilder builder = new ProcessBuilder();String cmd = commend.toString();builder.command(commend);Process p = builder.start();doWaitFor(p);p.destroy();//轉換完成后刪除源文件 // if (isDelSourceFile) { // deleteFile(sourceVideoPath); // }return true;} catch (Exception e) {e.printStackTrace();return false;}}/*** ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）* @param oldfilepath* @return*/private boolean processFLV(String oldfilepath) {if (!checkfile(sourceVideoPath)) {System.out.println(oldfilepath + " is not file");return false;}List<String> commend = new java.util.ArrayList<>();commend.add(ffmpegpath);commend.add("-i");commend.add(oldfilepath);commend.add("-ab");commend.add("64");commend.add("-acodec");commend.add("mp3");commend.add("-ac");commend.add("2");commend.add("-ar");commend.add("22050");commend.add("-b");commend.add("230");commend.add("-r");commend.add("24");commend.add("-y");commend.add(targetfolder + filerealname + ".flv");try {ProcessBuilder builder = new ProcessBuilder();String cmd = commend.toString();builder.command(commend);Process p = builder.start();doWaitFor(p);p.destroy();deleteFile(oldfilepath);return true;} catch (Exception e) {e.printStackTrace();return false;}}public int doWaitFor(Process p) {InputStream in = null;InputStream err = null;int exitValue = -1; // returned to caller when p is finishedtry {System.out.println("comeing");in = p.getInputStream();err = p.getErrorStream();boolean finished = false; // Set to true when p is finishedwhile (!finished) {try {while (in.available() > 0) {Character c = new Character((char) in.read());System.out.print(c);}while (err.available() > 0) {Character c = new Character((char) err.read());System.out.print(c);}exitValue = p.exitValue();finished = true;} catch (IllegalThreadStateException e) {Thread.currentThread().sleep(500);}}} catch (Exception e) {System.err.println("doWaitFor();: unexpected exception - " + e.getMessage());} finally {try {if (in != null) {in.close();}} catch (IOException e) {System.out.println(e.getMessage());}if (err != null) {try {err.close();} catch (IOException e) {System.out.println(e.getMessage());}}}return exitValue;}/**

3）最后,編寫測試類：ConverVideoTest.java

public class ConverVideoTest {public void run() {try {// 轉換并截圖String filePath = "C:\\Users\\wangdy\\Desktop\\pics\\05.尚硅谷_SVN_啟動服務器.wmv";ConverVideoUtils cv = new ConverVideoUtils(filePath);String targetExtension = ".mp4";boolean isDelSourseFile = true;boolean beginConver = cv.beginConver(targetExtension,isDelSourseFile);System.out.println(beginConver);} catch (Exception e) {e.printStackTrace();}}public static void main(String args[]) {ConverVideoTest c = new ConverVideoTest();c.run();} }

這樣就完成了整個視頻格式的轉換，在定義的目標視頻文件夾和截圖存放文件夾就可以看到轉換后的視頻和視頻第一幀的截圖了。

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