fix(diffusers): import WanImageToVideoPipeline, WanPipeline, and DiffusionPipeline safely

app.py

@@ -216,7 +216,7 @@ def normalize_civitai_url(url: str) -> str:
 
 def resolve_canvas(value: str) -> str:
     canvas = str(value).strip()
-    if canvas in CANVASES:
+    if canvas in CANVACES if "CANVACES" in locals() else CANVASES:
         return canvas
     return DEFAULT_CANVAS
 
@@ -412,7 +412,7 @@ def load_pipeline(model_repo: str = DEFAULT_MODEL_REPO):
 
     started = time.time()
     try:
-        from diffusers import WanImageToVideoPipeline, WanPipeline, AutoPipelineForImage2Video, AutoPipelineForText2Video
+        from diffusers import DiffusionPipeline, WanImageToVideoPipeline, WanPipeline
 
         print(f"[wan] loading pipeline from {model_repo} ...", flush=True)
         if "I2V" in model_repo or "i2v" in model_repo or "TI2V" in model_repo:
@@ -422,7 +422,7 @@ def load_pipeline(model_repo: str = DEFAULT_MODEL_REPO):
                     torch_dtype=torch.bfloat16,
                 )
             except Exception:
-                pipe = AutoPipelineForImage2Video.from_pretrained(
+                pipe = DiffusionPipeline.from_pretrained(
                     model_repo,
                     torch_dtype=torch.bfloat16,
                 )
@@ -433,7 +433,7 @@ def load_pipeline(model_repo: str = DEFAULT_MODEL_REPO):
                     torch_dtype=torch.bfloat16,
                 )
             except Exception:
-                pipe = AutoPipelineForText2Video.from_pretrained(
+                pipe = DiffusionPipeline.from_pretrained(
                     model_repo,
                     torch_dtype=torch.bfloat16,
                 )