[英]Capture video first frame file in java
我正在嘗試獲取視頻文件的第一幀。 我的代碼基於我在網上找到的一些示例,但我不明白編碼中有什么問題。
非常感謝您的幫助。
JAVA類:
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);
}
}
}
錯誤信息
Imgcodecs 類型中的 imwrite(String, Mat, MatOfInt) 方法不適用於參數 (String, Mat, int)
我已經更正了導入和這樣的代碼,它運行良好:
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);
}
}
}
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