Java如何获取视频时长及截取帧截图

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示例

添加依赖

<dependency>
      <groupId>org.bytedeco</groupId>
      <artifactId>javacv-platform</artifactId>
      <version>1.4.4</version>
    </dependency>

上述这段 maven 依赖包含了完整的 javacv 功能 (非常多，依赖Jar就占大概有500MB)，由于这里只使用到了其中 ffmpeg 这块的特性，因此也可以像下面这样排除掉无关的部分

<dependency>
      <groupId>org.bytedeco</groupId>
      <artifactId>javacv</artifactId>
      <version>1.4.4</version>
      <exclusions>
        <exclusion>
          <groupId>org.bytedeco</groupId>
          <artifactId>javacpp</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>flycapture</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libdc1394</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libfreenect</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libfreenect2</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>librealsense</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>videoinput</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>opencv</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>tesseract</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>leptonica</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>flandmark</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>artoolkitplus</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.bytedeco</groupId>
      <artifactId>javacv-platform</artifactId>
      <version>1.4.4</version>
      <exclusions>
        <exclusion>
          <groupId>org.bytedeco</groupId>
          <artifactId>javacv</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>flycapture-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libdc1394-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libfreenect-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>libfreenect2-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>librealsense-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>videoinput-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>opencv-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>tesseract-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>leptonica-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>flandmark-platform</artifactId>
        </exclusion>
        <exclusion>
          <groupId>org.bytedeco.javacpp-presets</groupId>
          <artifactId>artoolkitplus-platform</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

核心代码

获取视频时长

  /**
   * 获取视频时长，单位为秒
   *
   * @param video 源视频文件
   * @return 时长（s）
   */
  public static long getVideoDuration(File video) {
    long duration = 0L;
    FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
    try {
      ff.start();
      duration = ff.getLengthInTime() / (1000 * 1000);
      ff.stop();
    } catch (FrameGrabber.Exception e) {
      e.printStackTrace();
    }
    return duration;
  }

截取视频指定帧为图片

  /**
   * 截取视频获得指定帧的图片
   *
   * @param video  源视频文件
   * @param picPath 截图存放路径
   */
  public static void getVideoPic(File video, String picPath) {
    FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
    try {
      ff.start();
      // 截取中间帧图片(具体依实际情况而定)
      int i = 0;
      int length = ff.getLengthInFrames();
      int middleFrame = length / 2;
      Frame frame = null;
      while (i < length) {
        frame = ff.grabFrame();
        if ((i > middleFrame) && (frame.image != null)) {
          break;
        }
        i++;
      }
      // 截取的帧图片
      Java2DFrameConverter converter = new Java2DFrameConverter();
      BufferedImage srcImage = converter.getBufferedImage(frame);
      int srcImageWidth = srcImage.getWidth();
      int srcImageHeight = srcImage.getHeight();
      // 对截图进行等比例缩放(缩略图)
      int width = 480;
      int height = (int) (((double) width / srcImageWidth) * srcImageHeight);
      BufferedImage thumbnailImage = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
      thumbnailImage.getGraphics().drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
      File picFile = new File(picPath);
      ImageIO.write(thumbnailImage, "jpg", picFile);
      ff.stop();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

测试用例

  public static void main(String[] args) {
    String videoPath = ResourceUtils.CLASSPATH_URL_PREFIX + "video.mp4";
    File video = null;
    try {
      video = ResourceUtils.getFile(videoPath);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    String picPath = "video.jpg";
    getVideoPic(video, picPath);

    long duration = getVideoDuration(video);
    System.out.println("videoDuration = " + duration);
  }

Java是什么

Java是一门面向对象编程语言，可以编写桌面应用程序、Web应用程序、分布式系统和嵌入式系统应用程序。

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