详解如何用Java实现对m3u8直播流抽帧

<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>1.4.1</version>
</dependency>

import org.bytedeco.javacv.*;
import java.io.IOException;

public class FrameExtractor {
    public static void main(String[] args) throws IOException, FrameGrabber.Exception, FrameRecorder.Exception {
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("直播流地址xxx.m3u8");
        grabber.setOption("rtsp_transport", "tcp");
        grabber.start();

        Frame frame;
        Java2DFrameConverter converter = new Java2DFrameConverter();
        int i = 0;

        // grabber.grabImage() 获取帧图片，不包含音频
        // grabber.grab() 包含音频
        while ((frame = grabber.grabImage()) != null) {
            // 在这里处理抽取到的帧
            // 例如，将帧保存为图像文件
            converter.convert(frame).createGraphics().dispose();
            String outputFilename = "frame_" + i + ".jpg";
            File f = new File(outputFilename);
            if(!f.exists())f.mkdirs();
            ImageIO.write(converter.convert(frame), "jpg", f);
            i++;
        }
        grabber.stop();
    }
}

public class FrameExtractor {
    public static void main(String[] args) throws IOException, FrameGrabber.Exception, FrameRecorder.Exception {
        // 读取流
        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("http:.m3u8");
        grabber.setOption("rtsp_transport", "tcp");
        grabber.start();

        Frame frame;
        Java2DFrameConverter converter = new Java2DFrameConverter();

        // 控制读取帧数
        int frameRate = (int) grabber.getFrameRate();
        int targetFrameRateNum[] = {10,10}; //（每10秒读10帧） 目标帧率数量，每几秒钟读取几帧
        SortedSet<Integer> targetFrameRate = new TreeSet<>(); // 需要抽取的目标帧率
        // 计算需要抽取的目标帧
        int calFrameRate = frameRate * targetFrameRateNum[0];
        int partSize = calFrameRate / targetFrameRateNum[1];
        int remainder = calFrameRate % targetFrameRateNum[1];
        int current = 1;
        for (int i = 0; i < targetFrameRateNum[1]; i++) {
            // 避免出现帧数多一个
            if (current <= calFrameRate){
                targetFrameRate.add(current);
            }
            current += partSize;
            if (i < remainder) {
                current++;
            }
        }

        // 计数器
        int frameCount = 0;
        int i = 0;
        while ((frame = grabber.grabImage()) != null) {
            // 每读取一帧，增加计数器
            frameCount++;
            // 如果计数器达到目标帧率，则进行处理
            if (targetFrameRate.contains(frameCount)) {
                // 处理抽取到的帧

            }
            // 重置计数器
            if (calFrameRate == frameCount){
                frameCount = 0;
            }
        }

        grabber.stop();
    }
}