我正在尝试获取视频文件的第一帧。我的代码基于在网上找到的一些示例,但我不明白编码中有什么问题。
非常感谢您的帮助。
JAVA类别:
import org.bytedeco.javacv.*;
import org.bytedeco.javacpp.*;
import org.bytedeco.javacpp.indexer.*;
import org.bytedeco.opencv.opencv_core.*;
import org.bytedeco.opencv.opencv_videoio.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.Videoio;
import static org.bytedeco.opencv.global.opencv_core.*;
import static org.bytedeco.opencv.global.opencv_imgproc.*;
import static org.bytedeco.opencv.global.opencv_videoio.*;
import static org.bytedeco.opencv.global.opencv_imgcodecs.*;
public class VideoFrameCapture {
public static void main(String[] args) {
int initFrames;
Mat frame = new Mat();
VideoCapture capture = new VideoCapture("C:\\TMP\\video\\pub3.mp4");
capture.set(Videoio.CAP_PROP_FRAME_WIDTH,320);
capture.set(Videoio.CAP_PROP_FRAME_HEIGHT,240);
initFrames = (int) capture.get(1);
if (capture.isOpened()) {
capture.read(frame);
}
if (frame != null) {
Imgcodecs.imwrite("C:\\TMP\\video\\cover.jpg", frame, CV_16U);
}
}
}
错误消息
类型为Imgcodecs的imwrite(String,Mat,MatOfInt)方法不适用于参数(String,Mat,int)
我已经纠正了导入和类似的代码,并且效果很好:
import org.bytedeco.opencv.opencv_core.*;
import org.bytedeco.opencv.opencv_videoio.*;
import static org.bytedeco.opencv.global.opencv_core.*;
import static org.bytedeco.opencv.global.opencv_imgcodecs.*;
public class VideoFrameCapture {
public static void main(String[] args) {
int height = 240;
int width = 320;
Mat frame = new Mat(height, width, CV_8UC1);
VideoCapture capture = new VideoCapture("C:\\TMP\\video\\pub3.mp4");
if (capture.isOpened()) {
capture.read(frame);
}
if (frame != null) {
imwrite("C:\\TMP\\video\\cover.jpg", frame);
}
}
}