java 抽帧Xuggler

以下是使用Xuggler在Java中抽取视频帧的示例代码：

import com.xuggle.mediatool.IMediaListener;
import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.xuggler.IAudioSamples;
import com.xuggle.xuggler.IContainer;
import com.xuggle.xuggler.IError;
import com.xuggle.xuggler.IPacket;
import com.xuggle.xuggler.IStream;
import com.xuggle.xuggler.IStreamCoder;
import com.xuggle.xuggler.IVideoPicture;

public class FrameExtractor implements IMediaListener {

    private static final double SECONDS_BETWEEN_FRAMES = 10;
    private static final long MICRO_SECONDS_BETWEEN_FRAMES = (long) (Global.DEFAULT_PTS_PER_SECOND * SECONDS_BETWEEN_FRAMES);

    private long mLastPtsWrite = Global.NO_PTS;
    private final String mFilename;

    public FrameExtractor(String filename) {
        mFilename = filename;
    }

    public void extract() {
        // 创建一个媒体阅读器
        IMediaReader mediaReader = ToolFactory.makeReader(mFilename);

        // 设置媒体阅读器的监听器
        mediaReader.addListener(this);

        // 读取媒体文件中的数据
        while (mediaReader.readPacket() == null) ;

    }

    public void onVideoPicture(IVideoPictureEvent event) {
        try {
            // 获取视频图片
            IVideoPicture image = event.getPicture();

            // 如果当前时间与上一次写入时间之间的差值大于等于10秒，则写入该帧
            if (mLastPtsWrite == Global.NO_PTS || image.getPts() - mLastPtsWrite >= MICRO_SECONDS_BETWEEN_FRAMES) {

                // 更新上一次写入时间
                if (mLastPtsWrite == Global.NO_PTS)
                    mLastPtsWrite = image.getPts();

                // 获取当前帧的时间戳
                long seconds = ((image.getPts() - mLastPtsWrite) / Global.DEFAULT_PTS_PER_SECOND);
                String outputFilename = dumpImageToFile(image, seconds);

                // 输出写入的帧的信息
                System.out.printf("at elapsed time of %6.3f seconds wrote: %s\n", seconds, outputFilename);

                // 更新上一次写入时间
                mLastPtsWrite += MICRO_SECONDS_BETWEEN_FRAMES;
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void onAudioSamples(IAudioSamplesEvent event) {
        // 不处理音频数据
    }

    public String dumpImageToFile(IVideoPicture image, long seconds) {
        String outputFilename = "frame_" + seconds + ".png";

        // 将视频图片写入文件
        BufferedImage javaImage = Utils.videoPictureToImage(image);
        File outputFile = new File(outputFilename);
        ImageIO.write(javaImage, "png", outputFile);

        return outputFilename;
    }

    public static void main(String[] args) {
        FrameExtractor frameExtractor = new FrameExtractor("example.mp4");
        frameExtractor.extract();
    }
}

该示例代码使用Xuggler库读取视频文件，并在每10秒钟抽取一帧视频帧，并将其写入PNG文件。在示例代码中，我们使用了IVideoPictureEvent接口来处理视频帧，使用IAudioSamplesEvent接口来处理音频数据。同时，我们还使用了IVideoPicture接口来获取视频帧的数据，并使用BufferedImage类将其转换为Java图像。