采集卡bug修复

preview.py

@@ -4,8 +4,14 @@ from tkinter import Canvas
 from PIL import Image, ImageTk
 import threading
 import numpy as np
+import warnings
+import os
 from config import config_manager
 
+# 抑制OpenCV的警告信息
+os.environ['OPENCV_LOG_LEVEL'] = 'ERROR'
+cv2.setLogLevel(cv2.LOG_LEVEL_ERROR)
+
 class PreviewWindow:
     """采集卡预览窗口"""
     def __init__(self):
@@ -31,31 +37,60 @@ class PreviewWindow:
                 cam_idx = group['camera_index']
                 print(f"  尝试打开采集卡 {cam_idx} ({group['name']})...")
                 
-                cap = cv2.VideoCapture(int(cam_idx), cv2.CAP_DSHOW)
-                if not cap.isOpened():
-                    print(f"    DSHOW模式失败，尝试默认模式...")
-                    cap = cv2.VideoCapture(int(cam_idx))
+                cap = None
+                # 尝试多种后端打开
+                backends_to_try = [
+                    (int(cam_idx), cv2.CAP_DSHOW),
+                    (int(cam_idx), cv2.CAP_ANY),
+                    (int(cam_idx), None),
+                ]
                 
-                if cap.isOpened():
-                    cap.set(cv2.CAP_PROP_FRAME_WIDTH, group['camera_width'])
-                    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, group['camera_height'])
-                    # 测试读取一帧
-                    ret, test_frame = cap.read()
-                    if ret:
-                        self.caps[i] = {
-                            'cap': cap,
-                            'group': group,
-                            'name': group['name']
-                        }
-                        loaded_count += 1
-                        print(f"  ✅ 采集卡 {cam_idx} 初始化成功")
-                    else:
-                        cap.release()
-                        print(f"  ❌ 采集卡 {cam_idx} 无法读取帧")
+                for idx, backend in backends_to_try:
+                    try:
+                        with warnings.catch_warnings():
+                            warnings.filterwarnings('ignore')
+                            if backend is not None:
+                                cap = cv2.VideoCapture(idx, backend)
+                            else:
+                                cap = cv2.VideoCapture(idx)
+                        
+                        if cap.isOpened():
+                            # 测试读取一帧
+                            ret, test_frame = cap.read()
+                            if ret and test_frame is not None:
+                                break
+                            else:
+                                cap.release()
+                                cap = None
+                    except Exception:
+                        if cap:
+                            try:
+                                cap.release()
+                            except:
+                                pass
+                            cap = None
+                        continue
+                
+                if cap and cap.isOpened():
+                    try:
+                        cap.set(cv2.CAP_PROP_FRAME_WIDTH, group['camera_width'])
+                        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, group['camera_height'])
+                    except Exception as e:
+                        print(f"    ⚠️ 设置分辨率失败: {e}")
+                    
+                    self.caps[i] = {
+                        'cap': cap,
+                        'group': group,
+                        'name': group['name']
+                    }
+                    loaded_count += 1
+                    print(f"  ✅ 采集卡 {cam_idx} 初始化成功")
                 else:
                     print(f"  ❌ 采集卡 {cam_idx} 无法打开")
             except Exception as e:
                 print(f"  ❌ 采集卡 {group.get('camera_index', '?')} 初始化失败: {e}")
+                import traceback
+                traceback.print_exc()
         
         if loaded_count == 0:
             print("⚠️ 警告：没有成功加载任何采集卡！")