Update rerender_a_video.py fix dtype error (#10451)

Update rerender_a_video.py

Author: chaowenguo0101

examples/community/rerender_a_video.py

@@ -782,7 +782,7 @@ def __call__(
         self.attn_state.reset()
 
         # 4.1 prepare frames
-        image = self.image_processor.preprocess(frames[0]).to(dtype=torch.float32)
+        image = self.image_processor.preprocess(frames[0]).to(dtype=self.dtype)
         first_image = image[0]  # C, H, W
 
         # 4.2 Prepare controlnet_conditioning_image
@@ -926,8 +926,8 @@ def __call__(
             prev_image = frames[idx - 1]
             control_image = control_frames[idx]
             # 5.1 prepare frames
-            image = self.image_processor.preprocess(image).to(dtype=torch.float32)
-            prev_image = self.image_processor.preprocess(prev_image).to(dtype=torch.float32)
+            image = self.image_processor.preprocess(image).to(dtype=self.dtype)
+            prev_image = self.image_processor.preprocess(prev_image).to(dtype=self.dtype)
 
             warped_0, bwd_occ_0, bwd_flow_0 = get_warped_and_mask(
                 self.flow_model, first_image, image[0], first_result, False, self.device