Java基于整合ffmpeg的OpenCv3.5重组视频示例

官方教程:https://riptutorial.com/opencv/example/28548/creating-a-video-with-opencv--java-

个人简单封装一番,应用实例:

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.videoio.VideoCapture;
import org.opencv.videoio.VideoWriter;
import org.opencv.videoio.Videoio;

public class VideoOperatorTest {

    static {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    }

    public static void main(String[] args) {

        String localUrl = "/home/lab/1111.mp4";
        String outputPath = "/home/lab/2222.mp4";
        videoReassemble(localUrl,outputPath);
    }

    public static void videoReassemble(String inputPath,String outputPath) {
        VideoCapture capture = null;
        VideoWriter writer = null;
        long start = System.currentTimeMillis();
        try {
            capture = new VideoCapture(inputPath);
            int fourcc = VideoWriter.fourcc('x', '2', '6', '4'); // 编码方式 x264 
            Double fps = capture.get(Videoio.CV_CAP_PROP_FPS); // 帧率
            Size frameSize = new Size((int) capture.get(Videoio.CAP_PROP_FRAME_WIDTH),(int) capture.get(Videoio.CAP_PROP_FRAME_HEIGHT)); // 宽高
            writer = new VideoWriter(outputPath,fourcc,fps,frameSize,true);
            int i = 0;
            Mat frame = new Mat();
            while (capture.read(frame)) {
                if (i == 0) {
                    byte buff[] = new byte[(int) (frame.total() * frame.channels())];
                    frame.get(0,0,buff);
                    // 修改首帧像素值
                    frame.put(0,0,buff);
                }
                writer.write(frame);
                i++;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (capture != null) {
                capture.release();
            }
            if (writer != null) {
                writer.release();
            }
        }
        long end = System.currentTimeMillis();
        System.out.println("cost millis : " + (end - start));
    }

}