add callable object to convert frame into control_frame to reduce cpu memory usage. (#10501)

* Update rerender_a_video.py

* Update rerender_a_video.py

* Update examples/community/rerender_a_video.py
Co-authored-by: hlky <hlky@hlky.ac>

---------
Co-authored-by: hlky <hlky@hlky.ac>
Co-authored-by: YiYi Xu <yixu310@gmail.com>

examples/community/rerender_a_video.py

@@ -632,7 +632,7 @@ class RerenderAVideoPipeline(StableDiffusionControlNetImg2ImgPipeline):
                 The prompt or prompts to guide the image generation. If not defined, one has to pass `prompt_embeds`.
                 instead.
             frames (`List[np.ndarray]` or `torch.Tensor`): The input images to be used as the starting point for the image generation process.
-            control_frames (`List[np.ndarray]` or `torch.Tensor`): The ControlNet input images condition to provide guidance to the `unet` for generation.
+            control_frames (`List[np.ndarray]` or `torch.Tensor` or `Callable`): The ControlNet input images condition to provide guidance to the `unet` for generation or any callable object to convert frame to control_frame.
             strength ('float'): SDEdit strength.
             num_inference_steps (`int`, *optional*, defaults to 50):
                 The number of denoising steps. More denoising steps usually lead to a higher quality image at the
@@ -789,7 +789,7 @@ class RerenderAVideoPipeline(StableDiffusionControlNetImg2ImgPipeline):
         # Currently we only support single control
         if isinstance(controlnet, ControlNetModel):
             control_image = self.prepare_control_image(
-                image=control_frames[0],
+                image=control_frames(frames[0]) if callable(control_frames) else control_frames[0],
                 width=width,
                 height=height,
                 batch_size=batch_size,
@@ -924,7 +924,7 @@ class RerenderAVideoPipeline(StableDiffusionControlNetImg2ImgPipeline):
         for idx in range(1, len(frames)):
             image = frames[idx]
             prev_image = frames[idx - 1]
-            control_image = control_frames[idx]
+            control_image = control_frames(image) if callable(control_frames) else control_frames[idx]
             # 5.1 prepare frames
             image = self.image_processor.preprocess(image).to(dtype=self.dtype)
             prev_image = self.image_processor.preprocess(prev_image).to(dtype=self.dtype)