7， javac 入门学习2 -调用FFmpeg原生API和javaCP封装FFmpeg的音视频操作

java封装FFmpeg命令，支持原生ffmpeg全部命令，实现Ffmpeg多进程处理与多线程输出(开启，关闭，查询),rtsp/rtmp推流，拉流。
1，引入jar

    <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.7</version>
        </dependency>

2,测试代码，给视频截图

package com.taotao.javacv.test;

import org.bytedeco.javacv.*;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @ClassName JavacvCameraTest
 * @Description
 * @Author wang Jin
 * @Date 2022/10/21 0021 10:40
 */
public class JavacvCameraTest {
    public static void main(String[] args) throws Exception {

//        randomGrabberFFmpegImage("e:/ffmpeg/aa.mp4", "./target", "screenshot", 5);

        randomGrabberFFmpegImage("D:/data/1.mp4", "D:\data\target", "screenshot", 5);

    }

    public static void randomGrabberFFmpegImage(String filePath, String targerFilePath, String targetFileName, int randomSize)
            throws Exception {
        FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath);
        ff.start();

        int ffLength = ff.getLengthInFrames();
        List<Integer> randomGrab = random(ffLength, randomSize);
        int maxRandomGrab = randomGrab.get(randomGrab.size() - 1);
        Frame f;
        int i = 0;
        while (i < ffLength) {
            f = ff.grabImage();
            if (randomGrab.contains(i)) {
                doExecuteFrame(f, targerFilePath, targetFileName, i);
            }
            if (i >= maxRandomGrab) {
                break;
            }
            i++;
        }
        ff.stop();
    }

    public static void doExecuteFrame(Frame f, String targerFilePath, String targetFileName, int index) {
        if (null == f || null == f.image) {
            return;
        }

        Java2DFrameConverter converter = new Java2DFrameConverter();

        String imageMat = "png";
        String FileName = targerFilePath + File.separator + targetFileName + "_" + index + "." + imageMat;
        BufferedImage bi = converter.getBufferedImage(f);
        File output = new File(FileName);
        try {
            ImageIO.write(bi, imageMat, output);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static List<Integer> random(int baseNum, int length) {
        List<Integer> list = new ArrayList<>(length);
        while (list.size() < length) {
            Integer next = (int) (Math.random() * baseNum);
            if (list.contains(next)) {
                continue;
            }
            list.add(next);
        }
        Collections.sort(list);
        return list;
    }


}

package com.taotao.javacv.test;

import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.Frame;

import java.io.File;

/**
 * @ClassName ConvertToMp4
 * @Description springboot调用ffmpeg将webm视频格式转换为MP4格式
 * @Author wang Jin
 * @Date 2022/10/21 0021 11:33
 */
public class ConvertToMp4 {
    public static void main(String[] args) {
        String path="D:\data\1.webm";
        convertToMp4(new File(path));
    }
    public static String convertToMp4(File file) {

        FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(file);
        String fileName = null;
        Frame captured_frame = null;
        FFmpegFrameRecorder recorder = null;
        try {
            frameGrabber.start();
            fileName = file.getAbsolutePath() + "__.mp4";
            recorder = new FFmpegFrameRecorder(fileName, frameGrabber.getImageWidth(), frameGrabber.getImageHeight(), frameGrabber.getAudioChannels());
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
            recorder.setFormat("mp4");
            recorder.setFrameRate(frameGrabber.getFrameRate());
            recorder.setSampleRate(frameGrabber.getSampleRate());

            recorder.setAudioChannels(frameGrabber.getAudioChannels());
            recorder.setFrameRate(frameGrabber.getFrameRate());
            recorder.start();
            while ((captured_frame = frameGrabber.grabFrame()) != null) {
                try {
                    recorder.record(captured_frame);
                } catch (Exception e) {
                    System.out.println(e);
                }
            }
            recorder.stop();
            recorder.release();
            frameGrabber.stop();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fileName;
    }
}