| # Video processor function used in the original VIdeoPrism repo. | |
| import mediapy | |
| import numpy as np | |
| def read_and_preprocess_video( | |
| filename: str, target_num_frames: int, target_frame_size: tuple[int, int] | |
| ): | |
| """Reads and preprocesses a video.""" | |
| frames = mediapy.read_video(filename) | |
| # Sample to target number of frames. | |
| frame_indices = np.linspace(0, len(frames), num=target_num_frames, endpoint=False, dtype=np.int32) | |
| frames = np.array([frames[i] for i in frame_indices]) | |
| # Resize to target size. | |
| original_height, original_width = frames.shape[-3:-1] | |
| target_height, target_width = target_frame_size | |
| assert original_height * target_width == original_width * target_height, ( | |
| "Currently does not support aspect ratio mismatch." | |
| ) | |
| frames = mediapy.resize_video(frames, shape=target_frame_size) | |
| # Normalize pixel values to [0.0, 1.0]. | |
| frames = mediapy.to_float01(frames) | |
| return frames |