Fix first occurrence of balanced offload strategy (line 9384)

The balanced offload strategy existed in two places in the code.
The first occurrence at line 9384 was still using the old logic.
Now both occurrences have the improved VRAM estimation with:
- LoRA overhead accounting
- Inference overhead (30%)
- Conservative 70% threshold
- OOM fallback protection

videogen.py

@@ -9390,22 +9390,42 @@ def main(args):
             # Get available VRAM
             vram_total = torch.cuda.get_device_properties(0).total_memory / (1024**3)
             vram_allocated = torch.cuda.memory_allocated() / (1024**3)
-            vram_reserved = torch.cuda.memory_reserved() / (1024**3)
             vram_available = vram_total - vram_allocated
             
             # Estimate model size from VRAM requirements
+            # Add overhead for LoRA, inference, and model components not in estimate
             model_vram_est = parse_vram_estimate(m_info.get("vram", "~10 GB"))
             
-            # If model fits comfortably in available VRAM (with 15% buffer), load fully
-            if model_vram_est < vram_available * 0.85:
-                print(f"  📦 Balanced mode: Model (~{model_vram_est:.1f}GB) fits in VRAM ({vram_available:.1f}GB available)")
+            # Account for various overheads:
+            # - LoRA weights add ~2-4GB
+            # - Inference activation memory needs ~20-30% extra
+            # - Text encoder, VAE, scheduler not always in estimate
+            is_lora = m_info.get("is_lora", False)
+            lora_overhead = 4.0 if is_lora else 0.0  # LoRA adds significant overhead
+            inference_overhead = model_vram_est * 0.3  # 30% for activations during inference
+            
+            total_vram_needed = model_vram_est + lora_overhead + inference_overhead
+            
+            # Use conservative 70% threshold (30% safety buffer) for "balanced"
+            # This ensures we don't OOM during inference
+            vram_threshold = vram_available * 0.70
+            
+            if total_vram_needed < vram_threshold:
+                print(f"  📦 Balanced mode: Model (~{total_vram_needed:.1f}GB needed) fits in VRAM ({vram_available:.1f}GB available)")
                 print(f"     Loading fully to GPU (no offloading)")
-                pipe = pipe.to("cuda")
+                try:
+                    pipe = pipe.to("cuda")
+                except torch.cuda.OutOfMemoryError:
+                    # Fallback if moving to GPU fails
+                    print(f"     ⚠️  OOM when loading to GPU, falling back to model CPU offload")
+                    torch.cuda.empty_cache()
+                    gc.collect()
+                    pipe.enable_model_cpu_offload()
             else:
-                # Model too large, use sequential offloading but only for necessary layers
-                print(f"  📦 Balanced mode: Model (~{model_vram_est:.1f}GB) exceeds VRAM ({vram_available:.1f}GB available)")
-                print(f"     Using selective offloading to maximize VRAM usage")
-                pipe.enable_sequential_cpu_offload()
+                # Model too large, use model CPU offload (better than sequential for most cases)
+                print(f"  📦 Balanced mode: Model (~{total_vram_needed:.1f}GB needed) exceeds safe VRAM ({vram_available:.1f}GB available)")
+                print(f"     Using model CPU offload to prevent OOM")
+                pipe.enable_model_cpu_offload()
         else:
             pipe.to("cuda" if torch.cuda.is_available() else "cpu")