Skip colorspace detection when using offload strategies

Colorspace detection requires extra memory that may not be available
when using offload strategies (sequential, balanced, auto_map, group).
Now skips detection and defaults to RGB for:
- Any offload strategy other than 'none' or 'model'
- Systems with <12GB available RAM

Users can still manually set colorspace or use --swap_bgr if needed.

videogen.py

@@ -1367,6 +1367,28 @@ def get_model_colorspace(pipe, model_name, m_info, args):
     if model_name in MODELS and "colorspace" in MODELS[model_name]:
         return MODELS[model_name]["colorspace"]
     
+    # Skip detection if using offload strategies (memory-constrained)
+    # Colorspace detection requires extra memory that may not be available
+    offload_strategy = getattr(args, 'offload_strategy', 'model')
+    if offload_strategy not in ['none', 'model']:
+        print(f"  📊 Colorspace: Skipping detection (offload_strategy={offload_strategy})")
+        print(f"     Defaulting to RGB (use --swap_bgr if colors look wrong)")
+        # Save RGB as default to avoid repeated attempts
+        if model_name in MODELS:
+            MODELS[model_name]["colorspace"] = "RGB"
+            save_models_config(MODELS)
+        return "RGB"
+    
+    # Also skip if low system RAM
+    available_ram_gb = get_available_ram_gb()
+    if available_ram_gb < 12.0:  # Need ample RAM for detection
+        print(f"  📊 Colorspace: Skipping detection (low RAM: {available_ram_gb:.1f}GB)")
+        print(f"     Defaulting to RGB (use --swap_bgr if colors look wrong)")
+        if model_name in MODELS:
+            MODELS[model_name]["colorspace"] = "RGB"
+            save_models_config(MODELS)
+        return "RGB"
+    
     # Detect and save
     return detect_model_colorspace(pipe, model_name, m_info, args)