change download method

app.py

@@ -1418,19 +1418,16 @@ def create_ui(
 
 
 def download_required_files():
-    import subprocess
+    from huggingface_hub import snapshot_download
+    import urllib.request
 
-    # 1. Download "checkpoints" directory from huggingface.co/gdhe17/Self-Forcing
+    # 1. Download "checkpoints" directory from gdhe17/Self-Forcing
     if not os.path.exists("checkpoints"):
         print("Downloading checkpoints from gdhe17/Self-Forcing...")
-        subprocess.run(
-            [
-                "huggingface-cli", "download",
-                "gdhe17/Self-Forcing",
-                "--include", "checkpoints/*",
-                "--local-dir", ".",
-            ],
-            check=True,
+        snapshot_download(
+            repo_id="gdhe17/Self-Forcing",
+            allow_patterns=["checkpoints/*"],
+            local_dir=".",
         )
 
     # 2. Download Wan-AI/Wan2.1-T2V-1.3B and place in wan_models/Wan2.1-T2V-1.3B
@@ -1438,20 +1435,15 @@ def download_required_files():
     if not os.path.exists(wan_model_dir):
         print("Downloading Wan-AI/Wan2.1-T2V-1.3B...")
         os.makedirs("wan_models", exist_ok=True)
-        subprocess.run(
-            [
-                "huggingface-cli", "download",
-                "Wan-AI/Wan2.1-T2V-1.3B",
-                "--local-dir", wan_model_dir,
-            ],
-            check=True,
+        snapshot_download(
+            repo_id="Wan-AI/Wan2.1-T2V-1.3B",
+            local_dir=wan_model_dir,
         )
 
     # 3. Download SAM ViT-H checkpoint
     sam_checkpoint_path = "sam_vit_h_4b8939.pth"
     if not os.path.exists(sam_checkpoint_path):
         print("Downloading SAM ViT-H checkpoint...")
-        import urllib.request
         urllib.request.urlretrieve(
             "https://dl.fbaipublicfiles.com/segment_anything/sam_vit_h_4b8939.pth",
             sam_checkpoint_path,