提高视频帧率

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

@@ -41,7 +41,11 @@ import java.util.Collections;
 import java.util.UUID;
 
 import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+import javax.imageio.stream.ImageOutputStream;
 import java.awt.image.BufferedImage;
+import java.awt.Image;
 
 import static org.bytedeco.opencv.global.opencv_core.CV_8UC3;
 
@@ -342,19 +346,49 @@ public class MediaTransferFlvByJavacv extends MediaTransfer implements Runnable
             return;
         }
         
+        // 优化：跳帧处理，只推送 1/3 的帧（25fps -> 8.3fps，如果还慢可改为 %3）
+        // 如果帧率太低，可以改为 % 2（推送 50% 帧）；如果还是慢，保持 % 3（推送 33% 帧）
+        if (totalFrames % 3 != 0) {
+            droppedFrames++;
+            return;
+        }
+        
         if (totalFrames == 1) {
             log.info("📤 开始推流到客户端，客户端数量: {}", contexts.size());
         }
         
         try {
-            // 转换为JPEG字节
+            // 转换为JPEG字节（优化：降低质量和分辨率以提高帧率）
             BufferedImage bufferedImage = toImage.convert(frame);
             if (bufferedImage == null) {
                 return;
             }
             
+            // 优化1：降低分辨率（缩小到60%，更快）
+            int targetWidth = (int) (bufferedImage.getWidth() * 0.6);
+            int targetHeight = (int) (bufferedImage.getHeight() * 0.6);
+            BufferedImage scaledImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
+            
+            // 使用快速缩放（Graphics2D）
+            java.awt.Graphics2D g2d = scaledImage.createGraphics();
+            g2d.setRenderingHint(java.awt.RenderingHints.KEY_INTERPOLATION, 
+                                 java.awt.RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR); // 最快
+            g2d.drawImage(bufferedImage, 0, 0, targetWidth, targetHeight, null);
+            g2d.dispose();
+            
+            // 优化2：使用低质量 JPEG 编码（质量 0.5，速度快很多）
             ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-            ImageIO.write(bufferedImage, "jpg", outputStream);
+            ImageWriter jpegWriter = ImageIO.getImageWritersByFormatName("jpeg").next();
+            ImageWriteParam jpegParams = jpegWriter.getDefaultWriteParam();
+            jpegParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+            jpegParams.setCompressionQuality(0.5f); // 质量 50%（默认 75-90%）
+            
+            ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(outputStream);
+            jpegWriter.setOutput(imageOutputStream);
+            jpegWriter.write(null, new javax.imageio.IIOImage(scaledImage, null, null), jpegParams);
+            jpegWriter.dispose();
+            imageOutputStream.close();
+            
             byte[] imageBytes = outputStream.toByteArray();
             
             // 每1000帧输出一次统计