修复问题

ruoyi-video/src/main/java/com/ruoyi/video/thread/MediaTransferFlvByJavacv.java

@@ -25,6 +25,7 @@ import org.springframework.util.CollectionUtils;
 
 import java.io.ByteArrayOutputStream;
 import java.net.URL;
+import java.nio.ByteBuffer;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
@@ -105,6 +106,7 @@ public class MediaTransferFlvByJavacv extends MediaTransfer implements Runnable
 
     // 解码/推理/发送解耦
     private final OpenCVFrameConverter.ToMat toMat = new OpenCVFrameConverter.ToMat();
+    private final OpenCVFrameConverter.ToMat matToFrameConverter = new OpenCVFrameConverter.ToMat();
     private final AtomicReference<Mat> latestFrame = new AtomicReference<>();
     private final AtomicReference<List<Detection>> latestDetections =
             new AtomicReference<>(java.util.Collections.emptyList());
@@ -442,14 +444,16 @@ public class MediaTransferFlvByJavacv extends MediaTransfer implements Runnable
 
                     if (enableDetection) {
                         Mat src = latestFrame.get();
-                        if (src == null || src.empty()) continue;
+                        if (src == null || src.empty()) {
+                            continue;
+                        }
 
                         // 叠加最近一次检测结果
                         List<Detection> dets = latestDetections.get();
                         if (!CollectionUtils.isEmpty(dets)) {
                             Overlay.draw(dets, src);
                         }
-                        // 更新“最近叠好框的帧”用于存证
+                        // 更新"最近叠好框的帧"用于存证
                         updateLatestAnnotated(src);
 
                         // 统计（仅窗口巡检时）
@@ -460,7 +464,27 @@ public class MediaTransferFlvByJavacv extends MediaTransfer implements Runnable
                             finishWindow();
                         }
 
-                        frame = toMat.convert(src);
+                        // 完全重新创建Frame，避免使用转换器
+                        int width = src.cols();
+                        int height = src.rows();
+                        int depth = src.depth();
+                        int channels = src.channels();
+                        
+                        // 创建新的Frame
+                        frame = new Frame(width, height, Frame.DEPTH_UBYTE, channels);
+                        
+                        // 将Mat数据复制到Frame
+                        ByteBuffer frameBuffer = (ByteBuffer)frame.image[0];
+                        frameBuffer.clear();
+                        
+                        // 确保Mat是连续的
+                        Mat continuous = src.isContinuous() ? src : src.clone();
+                        byte[] matData = new byte[Math.toIntExact(continuous.total() * continuous.elemSize())];
+                        continuous.data().get(matData);
+                        
+                        // 复制数据
+                        frameBuffer.put(matData);
+                        frameBuffer.rewind();
                     } else {
                         frame = grabber.grab();
                     }

ruoyi-video/src/main/java/com/ruoyi/video/thread/detector/DummyDetector.java

@@ -0,0 +1,29 @@
+package com.ruoyi.video.thread.detector;
+
+import com.ruoyi.video.domain.Detection;
+import org.bytedeco.opencv.opencv_core.*;
+
+import java.util.*;
+
+/**
+ * 空检测器，用于在模型加载失败时提供回退机制
+ */
+public class DummyDetector implements YoloDetector {
+    private final String name;
+    
+    public DummyDetector(String name) {
+        this.name = name;
+        System.out.println("警告: 使用DummyDetector替代真实模型 - " + name);
+    }
+    
+    @Override
+    public String name() {
+        return name;
+    }
+    
+    @Override
+    public List<Detection> detect(Mat bgr) {
+        // 返回空列表，不进行实际检测
+        return Collections.emptyList();
+    }
+}