| import torchvision |
| from PIL import Image, ImageDraw |
| import imageio |
| import cv2 |
| import torch |
| import numpy as np |
| import zipfile |
|
|
| def render_video(tensor_fgr, |
| tensor_pha, |
| nrow=8, |
| normalize=True, |
| value_range=(-1, 1)): |
| def to_tensor(arr_list): |
| tensor_list= [torch.from_numpy(arr).float().div_(127.5).sub_(1) for arr in arr_list] |
| tensor_list = torch.stack(tensor_list, dim = 0).permute(3,0,1,2).unsqueeze(0) |
| return tensor_list |
| |
| if not torch.is_tensor(tensor_fgr): |
| tensor_fgr = to_tensor(tensor_fgr) |
| if not torch.is_tensor(tensor_pha): |
| tensor_pha = to_tensor(tensor_pha) |
|
|
| tensor_fgr = tensor_fgr.clamp(min(value_range), max(value_range)) |
| tensor_fgr = torch.stack([ |
| torchvision.utils.make_grid( |
| u, nrow=nrow, normalize=normalize, value_range=value_range) |
| for u in tensor_fgr.unbind(2) |
| ], |
| dim=1).permute(1, 2, 3, 0) |
| tensor_fgr = (tensor_fgr * 255).type(torch.uint8).cpu() |
|
|
| tensor_pha = tensor_pha.clamp(min(value_range), max(value_range)) |
| tensor_pha = torch.stack([ |
| torchvision.utils.make_grid( |
| u, nrow=nrow, normalize=normalize, value_range=value_range) |
| for u in tensor_pha.unbind(2) |
| ], |
| dim=1).permute(1, 2, 3, 0) |
| tensor_pha = (tensor_pha * 255).type(torch.uint8).cpu() |
|
|
| frames = [] |
| frames_fgr = [] |
| frames_pha = [] |
| for frame_fgr, frame_pha in zip(tensor_fgr.numpy(), tensor_pha.numpy()): |
| if frame_pha.shape[-1] == 1: |
| frame_pha = frame_pha[:,:,0] |
| else: |
| frame_pha = (0.0 + frame_pha[:,:,0:1] + frame_pha[:,:,1:2] + frame_pha[:,:,2:3]) / 3. |
| frame = np.concatenate([frame_fgr[:,:,::-1], frame_pha.astype(np.uint8)], axis=2) |
| frames.append(frame) |
| frames_fgr.append(frame_fgr) |
| frames_pha.append(frame_pha) |
|
|
| def create_checkerboard(size=30, pattern_size=(830, 480), color1=(140, 140, 140), color2=(113, 113, 113)): |
| img = Image.new('RGB', (pattern_size[0], pattern_size[1]), color1) |
| draw = ImageDraw.Draw(img) |
| for i in range(0, pattern_size[0], size): |
| for j in range(0, pattern_size[1], size): |
| if (i + j) // size % 2 == 0: |
| draw.rectangle([i, j, i+size, j+size], fill=color2) |
| return img |
|
|
| def blender_background(frame_rgba, checkerboard): |
| alpha_channel = frame_rgba[:, :, 3:] / 255. |
| checkerboard = np.array(checkerboard) |
| checkerboard = cv2.resize(checkerboard, (frame_rgba.shape[1], frame_rgba.shape[0])) |
|
|
| frame_rgb = frame_rgba[:, :, :3] * alpha_channel + checkerboard * (1-alpha_channel) |
| return frame_rgb.astype(np.uint8)[:,:,::-1] |
| |
| checkerboard = create_checkerboard() |
| video_checkerboard = [torch.from_numpy(blender_background(f, checkerboard).copy()).float().div_(127.5).sub_(1) for f in frames] |
| video_checkerboard = torch.stack(video_checkerboard ).permute(3, 0, 1, 2) |
| return video_checkerboard, frames |
|
|
| def from_BRGA_numpy_to_RGBA_torch(video): |
| video = [torch.from_numpy(f.copy()).float().div_(127.5).sub_(1) for f in video] |
| video = torch.stack(video).permute(3, 0, 1, 2) |
| video[[0, 2], ...] = video[[2, 0], ...] |
| return video |
|
|
| def write_zip_file(zip_path, frames): |
| |
| with zipfile.ZipFile(zip_path, 'w', zipfile.ZIP_DEFLATED) as zipf: |
| for idx, img in enumerate(frames): |
| success, buffer = cv2.imencode(".png", img) |
| if not success: |
| print(f"Failed to encode image {idx}, skipping...") |
| continue |
| |
| filename = f"img_{idx:03d}.png" |
| zipf.writestr(filename, buffer.tobytes()) |
