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app.py

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+import cv2
+import av
+import asyncio
+import numpy as np
+import streamlit as st
+from streamlit_webrtc import WebRtcMode, webrtc_streamer
+
+# Fix asyncio event loop issue on Windows
+if hasattr(asyncio, 'WindowsSelectorEventLoopPolicy'):
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+# Load Haarcascade model
+face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
+
+# Face detection function for WebRTC
+def video_frame_callback(frame: av.VideoFrame) -> av.VideoFrame:
+    img = frame.to_ndarray(format="bgr24")
+    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+    faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30))
+
+    for (x, y, w, h) in faces:
+        cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)
+
+    return av.VideoFrame.from_ndarray(img, format="bgr24")
+
+# Streamlit UI
+st.title("Real-Time Face Detection")
+st.write("Using OpenCV and Haar Cascade Model")
+
+# WebRTC streamer
+webrtc_streamer(
+    key="face-detection",
+    mode=WebRtcMode.SENDRECV,
+    rtc_configuration={"iceServers": [{"urls": ["stun:stun.l.google.com:19302"]}]},
+    video_frame_callback=video_frame_callback,
+    async_processing=True  # Keep this enabled for async processing
+)

requirements.txt

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+aioice==0.9.0
+aiortc==1.10.1
+altair==5.5.0
+attrs==25.2.0
+av==13.1.0
+blinker==1.9.0
+cachetools==5.5.2
+certifi==2025.1.31
+cffi==1.17.1
+charset-normalizer==3.4.1
+click==8.1.8
+colorama==0.4.6
+cryptography==44.0.2
+dnspython==2.7.0
+gitdb==4.0.12
+GitPython==3.1.44
+google-crc32c==1.6.0
+idna==3.10
+ifaddr==0.2.0
+Jinja2==3.1.6
+jsonschema==4.23.0
+jsonschema-specifications==2024.10.1
+MarkupSafe==3.0.2
+narwhals==1.30.0
+numpy==2.2.3
+opencv-python==4.11.0.86
+packaging==24.2
+pandas==2.2.3
+pillow==11.1.0
+protobuf==5.29.3
+pyarrow==19.0.1
+pycparser==2.22
+pydeck==0.9.1
+pyee==12.1.1
+pylibsrtp==0.11.0
+pyOpenSSL==25.0.0
+python-dateutil==2.9.0.post0
+pytz==2025.1
+referencing==0.36.2
+requests==2.32.3
+rpds-py==0.23.1
+six==1.17.0
+smmap==5.0.2
+streamlit==1.43.2
+streamlit-webrtc==0.49.0
+tenacity==9.0.0
+toml==0.10.2
+tornado==6.4.2
+typing_extensions==4.12.2
+tzdata==2025.1
+urllib3==2.3.0
+watchdog==6.0.0