如何在JAVA中使用ffmepg处理视频？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
FFmepg安装
路径：
然后在使用的类中生命一个全局变量就好
private static String ffmpegPath = "C:\\hk\\ffmpeg\\bin\\ffmpeg.exe"; //ffmepg的绝对路径视频压缩
注意：此压缩视频涉及转码，对cpu的占用比较大（能不压缩尽量不压缩）
public static void toCompressFile(String convertFile,String targetFile) throws IOException { List<String> command = new ArrayList<String>(); command.add(ffmpegPath); command.add("-i"); command.add(convertFile); command.add("-r"); command.add("15"); command.add("-b:v"); command.add("600k"); command.add("-s"); command.add("1280x720"); command.add(targetFile); ProcessBuilder builder = new ProcessBuilder(command); Process process = null; try { process = builder.start(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 使用这种方式会在瞬间大量消耗CPU和内存等系统资源，所以这里我们需要对流进行处理 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(); } logger.info("-------------------压缩完成---转存文件--"+targetFile+"-------------"); }获取视频合并
public static String mergeVideo(List<String> list, String outputDir, String outputFile) { try { String format1 = "%s -i %s -c copy -bsf:v h364_mp4toannexb -f mpegts %s"; List<String> commandList = new ArrayList<>(6); List<String> inputList = new ArrayList<>(6); for (int i = 0; i < list.size(); i++) { String input = String.format("input%d.ts", i + 1); String command = String.format(format1, ffmpegPath, list.get(i), outputDir + input); commandList.add(command); inputList.add(input); } String command = getCommand(outputDir,outputFile, inputList); commandList.add(command); Boolean falg = Boolean.FALSE; for (int i = 0; i < commandList.size(); i++) { if (execCommand(commandList.get(i)) > 0) falg = true; } if (falg) { for (int i = 0; i < inputList.size(); i++) { if (i != commandList.size() - 1) { File file = new File(outputDir + inputList.get(i)); file.delete(); } }// //删除压缩的文件// for (String s:list// ) {// new File(s).delete();// } return outputFile; } else { return "fail"; } } catch (Exception e) { e.printStackTrace(); logger.error("-----合并失败!!!!!!" + outputFile); return "fail"; } } private static Integer execCommand(String command) { logger.info("execCommand.exec command={}",command); try { Process process = Runtime.getRuntime().exec(command); //获取进程的标准输入流 final InputStream is1 = process.getInputStream(); //获取进城的错误流 final InputStream is2 = process.getErrorStream(); //启动两个线程，一个线程负责读标准输出流，另一个负责读标准错误流 readInputStream(is1); readInputStream(is2); process.waitFor(); process.destroy(); logger.info("-----操作成功" + command + " " + sdf.format(new Date())); return 1; } catch (Exception e) { e.printStackTrace(); System.out.println("-----操作失败" + command); return -1; } } private static void readInputStream(InputStream inputStream) { new Thread(() -> { BufferedReader br1 = new BufferedReader(new InputStreamReader(inputStream)); try { String line1; while ((line1 = br1.readLine()) != null) { if (line1 != null) { } } } catch (IOException e) { e.printStackTrace(); } finally { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } }).start(); }视频分片（分割）
public static List<Map<String,Object>> splitVideoFile(String fileName, String outputPath, float videoTime, int periodTime, boolean merge) { final String TAG = "----------------------------"; // 在outputPath路径下根据系统时间创建目录 File file = createFileBySysTime(outputPath); if (file == null) { System.out.println("分割视频失败，创建目录失败"); return null; } outputPath = file.getPath() + File.separator; // 更新视频输出目录 // 计算视频分割的个数 int count;// 分割为几段 float remain = 0; // 不足一次剪辑的剩余时间 if (merge) { count = (int) (videoTime / periodTime); remain = videoTime % periodTime; // 不足一次剪辑的剩余时间 } else { count = (int) (videoTime / periodTime) + 1; } System.out.println("将视频分割为" + count + "段，每段约" + periodTime + "分钟"); String indexName; // 第 i 个视频，打印日志用 final String FFMPEG = ffmpegPath; String startTime; // 每段视频的开始时间 String periodVideoName; // 每段视频的名字，名字规则：视频i_时间段xx_yy float duration; // 每次分割的时长 String command;// 执行的命令 // 得到视频后缀 如.mp4 String videoSuffix = fileName.substring(fileName.lastIndexOf("."));//得到点后面的后缀，包括点 Runtime runtime = Runtime.getRuntime(); // 执行命令者 List<Map<String,Object>> list =new ArrayList<>(); // 将视频分割为count段 for (int i = 0; i < count; i++) { Map<String,Object> map =new HashMap<>(); indexName = "第" + (i+1) + "个视频"; // 决定是否将整个视频结尾部分不足一次的时间，合并到最后一次分割的视频中 if (merge) { if (i == count - 1) { duration = periodTime * 60 + remain * 60;// 将整个视频不足一次剪辑的时间，拼接在最后一次剪裁中 if(periodTime * i /60 >= 1){ startTime = "0"+periodTime * i /60+ ":00:00"; }else{ startTime = periodTime * i + ":00"; } periodVideoName = "video" + (i+1) + "_" + periodTime * i + "_end" + videoSuffix; } else { duration = periodTime * 60; if(periodTime * i /60 >= 1){ startTime = "0"+periodTime * i /60+ ":00:00"; }else{ startTime = periodTime * i + ":00"; } periodVideoName = "video" +(i+1) + "_" + periodTime * i + "_" + periodTime * (i + 1) + videoSuffix; } } else { duration = periodTime * 60; if(periodTime * i /60 >= 1){ startTime = "0"+periodTime * i /60+ ":00:00"; }else{ startTime = periodTime * i + ":00"; } periodVideoName = "video" + (i+1) + "_" + periodTime * i + "_" + periodTime * (i + 1) + videoSuffix; } // 执行分割命令 try { // 创建命令 command = FFMPEG + " -ss " + startTime +" -accurate_seek "+ " -i " + fileName + " -c copy -t " + duration + " " + outputPath + periodVideoName; System.out.println(TAG); System.out.println(indexName); System.out.println("执行命令：" + command); runtime.exec(command); System.out.println(indexName + "分割成功"); map.put("videoPath",(outputPath + periodVideoName).replace("\\","/")); map.put("count",i); list.add(map); } catch (Exception e) { e.printStackTrace(); System.out.println(indexName + "分割失败!!!!!!"); } } //删除原来的大视频 new File(fileName).delete(); return list; } public static File createFileBySysTime(String path) { // 1. 读取系统时间 Calendar calendar = Calendar.getInstance(); Date time = calendar.getTime(); // 2. 格式化系统时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss"); String fileName = format.format(time); //获取系统当前时间并将其转换为string类型,fileName即文件名 // 3. 创建文件夹 String newPath = path + fileName; File file = new File(newPath); //如果文件目录不存在则创建目录 if (!file.exists()) { if (!file.mkdir()) { System.out.println("当前路径不存在，创建失败"); return null; } } System.out.println("创建成功" + newPath); return file; }获取视频的时长
public static long getVideoDuration(File video) { long duration = 0L; FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video); try { ff.start(); duration = ff.getLengthInTime() / (1000 * 1000 * 60); ff.stop(); } catch (FrameGrabber.Exception e) { e.printStackTrace(); } return duration; }视频剪切
public static String videoClip(String videoInputPath,String startTime,String endTime,String devIp) throws IOException { SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat dtf=new SimpleDateFormat("yyyyMMddHHmmss"); //判断转码文件是否存在 if(!new File(videoInputPath).exists()){ System.out.println("需要处理的视频不存在"); return null; } StringBuffer videoOutPath = new StringBuffer(); videoOutPath.append("C:/video/playBack/"+devIp+"/"+sdf1.format(new Date())+"/clip/"); File file = new File(videoOutPath.toString()); if (!file.exists()){ file.mkdirs(); } videoOutPath.append(dtf.format(new Date())+".mp4"); List<String> command = new ArrayList<String>(); command.add(ffmpegPath); command.add("-ss"); command.add(startTime); command.add("-t"); command.add(endTime); command.add("-i"); command.add(videoInputPath); command.add("-c"); command.add("copy"); command.add(videoOutPath.toString()); command.add("-y"); ProcessBuilder builder = new ProcessBuilder(command); Process process = null; try { process = builder.start(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } 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(); } return videoOutPath.toString(); }视频转GIF（MP4）
public static String mp4ToGif(String inputVideoPath,String createGif) { String name = UUID.randomUUID().toString().replaceAll("-", ""); String paletteFile = createGif +name + ".png"; String gifFile = createGif+name + ".gif"; boolean isComplete = false; //操作ffmpeg生成gif图片 for (int i = 0; i < 5; i++) { try { //生成调色板 Process p = new ProcessBuilder() .command(ffmpegPath, "-v", "warning", "-ss", "2", "-t", "10", "-i", inputVideoPath, "-vf", "fps=5,scale=400:-1:flags=lanczos,palettegen", "-y", paletteFile, "-vn") .redirectError(new File("stderr.txt")) .start(); isComplete = p.waitFor(10, TimeUnit.SECONDS); if (!isComplete) { System.out.println("生成调色板出错"); } else { List<String> command = new ArrayList<String>(); command.add(ffmpegPath); command.add("-v"); command.add("warning"); command.add("-ss"); command.add("2"); command.add("-t"); command.add("10"); command.add("-i"); command.add(inputVideoPath); command.add("-i"); command.add(paletteFile); command.add("-lavfi"); command.add("fps=5,scale=400:-1:flags=lanczos [x]; [x][1:v] paletteuse"); command.add("-y"); command.add(gifFile); command.add("-vn"); ProcessBuilder builder = new ProcessBuilder(command); Process process = null; try { process = builder.start(); isComplete = process.waitFor(10, TimeUnit.SECONDS); if (isComplete) { new File(paletteFile).delete(); System.out.println("生成gif成功"); break; } else { System.out.println("生成gif出错"); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }// process = new ProcessBuilder()// .command(ffmpegPath,// "-v", "warning",// "-ss", "2",// "-t", "10",// "-i", "E:\\Video_2021-05-14_113013.mp4",// "-i", paletteFile,// "-lavfi", "fps=5,scale=400:-1:flags=lanczos [x]; [x][1:v] paletteuse",// "-y", gifFile, "-vn")// .redirectError(new File("stderr.txt"))// .start();// isComplete = process.waitFor(10, TimeUnit.SECONDS);// if (isComplete) {// System.out.println("生成gif成功");// break;// } else {// System.out.println("生成gif出错");// } } } catch (Exception e) { System.out.println("生成gif出错"); } } return gifFile; }java基本数据类型有哪些
Java的基本数据类型分为：1、整数类型，用来表示整数的数据类型。2、浮点类型，用来表示小数的数据类型。3、字符类型，字符类型的关键字是“char”。4、布尔类型，是表示逻辑值的基本数据类型。
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