如何在JAVA中使用ffmepg处理视频

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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