Create app.py

app.py

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+import cv2
+from PIL import Image
+import clip
+import torch
+import math
+import numpy as np
+import torch
+import datetime
+
+
+# Load the open CLIP model
+device = "cuda" if torch.cuda.is_available() else "cpu"
+model, preprocess = clip.load("ViT-B/32", device=device)
+
+
+
+def search_video(search_query, display_heatmap=True, display_results_count=1):
+  
+    # Encode and normalize the search query using CLIP
+    with torch.no_grad():
+      text_features = model.encode_text(clip.tokenize(search_query).to(device))
+      text_features /= text_features.norm(dim=-1, keepdim=True)
+  
+    # Compute the similarity between the search query and each frame using the Cosine similarity
+    similarities = (100.0 * video_features @ text_features.T)
+    values, best_photo_idx = similarities.topk(display_results_count, dim=0)
+  
+  
+    for frame_id in best_photo_idx:
+      frame = video_frames[frame_id]
+      # Find the timestamp in the video and display it
+      seconds = round(frame_id.cpu().numpy()[0] * N / fps)
+    return frame,f"Found at {str(datetime.timedelta(seconds=seconds))}"
+     
+
+def inference(video, text):
+  # The frame images will be stored in video_frames
+  video_frames = []
+  # Open the video file
+  capture = cv2.VideoCapture(video)
+  fps = capture.get(cv2.CAP_PROP_FPS)
+  
+  current_frame = 0
+  while capture.isOpened():
+    # Read the current frame
+    ret, frame = capture.read()
+  
+    # Convert it to a PIL image (required for CLIP) and store it
+    if ret == True:
+      video_frames.append(Image.fromarray(frame[:, :, ::-1]))
+    else:
+      break
+  
+    # Skip N frames
+    current_frame += N
+    capture.set(cv2.CAP_PROP_POS_FRAMES, current_frame)
+  
+  # Print some statistics
+  print(f"Frames extracted: {len(video_frames)}")
+  
+  
+  # You can try tuning the batch size for very large videos, but it should usually be OK
+  batch_size = 256
+  batches = math.ceil(len(video_frames) / batch_size)
+  
+  # The encoded features will bs stored in video_features
+  video_features = torch.empty([0, 512], dtype=torch.float16).to(device)
+  
+  # Process each batch
+  for i in range(batches):
+    print(f"Processing batch {i+1}/{batches}")
+  
+    # Get the relevant frames
+    batch_frames = video_frames[i*batch_size : (i+1)*batch_size]
+    
+    # Preprocess the images for the batch
+    batch_preprocessed = torch.stack([preprocess(frame) for frame in batch_frames]).to(device)
+    
+    # Encode with CLIP and normalize
+    with torch.no_grad():
+      batch_features = model.encode_image(batch_preprocessed)
+      batch_features /= batch_features.norm(dim=-1, keepdim=True)
+  
+    # Append the batch to the list containing all features
+    video_features = torch.cat((video_features, batch_features))
+  
+  # Print some stats
+  print(f"Features: {video_features.shape}")
+ 
+  return search_video(text)
+  
+  
+