长尾关键词挖掘爱站网_html简单个人主页代码模板_搜索引擎名词解释_18岁以上站长统计

背景说明：

1、在使用 FfmpegFrameGrabber 调用本地视频文件，逐帧读取视频内容

FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(file);
// 不读取音频，否则frame.image = null
grabber.setAudioStream(-1);
grabber.start();

2、遍历所有帧

while(true){// 抓取目标帧Frame frame = grabber.grabFrame();if(frame == null){break;}if(frame.image == null){continue;}
}

3、frame转BufferedImage

在大部分的网站搜索中，通常使用Java2DFrameConverter 函数进行frame提取转换，

但占用过多CPU

import com.arcsoft.face.FaceInfo;
import com.arcsoft.face.enums.ImageFormat;
import com.arcsoft.face.toolkit.ImageFactory;
import com.arcsoft.face.toolkit.ImageInfo;import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;Java2DFrameConverter jfc = new Java2DFrameConverter();
BufferedImage bufferedImage = jfc.getBufferedImage(frame);
ImageInfo imageInfo = ImageFactory.bufferedImage2ImageInfo(bufferedImage);

4、采用读取Frame.image直接获取

ImageInfo imageInfo = new ImageInfo();
imageInfo.setWidth(frame.imageWidth);
imageInfo.setHeight(frame.imageHeight);
imageInfo.setImageFormat(ImageFormat.CP_PAF_RGB24);
imageInfo.setImageData(convertByteArray((ByteBuffer)frame.image[0]));

private  byte[] convertByteArray(ByteBuffer buffer)   {int length = buffer.remaining();// 创建目标 byte[] 数组byte[] result = new byte[length];int offset = 0;// 复制每个 DirectByteBuffer 的内容到 byte[] 数组buffer.get(result, offset, length);buffer.rewind(); // 重置缓冲区位置return result;
}

部分参数的变动需要参考读取帧Frame对象的内容做适当调整

参考 Java2DFrameConverter 的 getBufferedImageType()

public static int getBufferedImageType(Frame frame) {int type = 0;if (frame.imageChannels == 1) {if (frame.imageDepth != 8 && frame.imageDepth != -8) {if (frame.imageDepth == 16) {type = 11;}} else {type = 10;}} else if (frame.imageChannels == 3) {if (frame.imageDepth == 8 || frame.imageDepth == -8) {type = 5;}} else if (frame.imageChannels == 4 && (frame.imageDepth == 8 || frame.imageDepth == -8)) {type = 6;}return type;}