added function to extract thumbnail from videos

Author: ibtsam3301

extract_thumbnail_from_video.py

@@ -0,0 +1,39 @@
+import cv2
+import os
+
+def extract_thumbnail(video_path, frame_size):
+    """
+    Extracts a thumbnail frame from a video and saves it as an image file.
+
+    Args:
+        video_path (str): The path to the input video file.
+        frame_size (tuple): A tuple containing the desired dimensions (width, height) for the thumbnail frame.
+
+    Raises:
+        Exception: If the function fails to extract a frame from the video.
+
+    The function opens the specified video file, seeks to the middle frame,
+    resizes the frame to the specified dimensions, and saves it as an image
+    file with a filename derived from the video's base name.
+
+    Example:
+        extract_thumbnail('my_video.mp4', (320, 240))
+    
+    Required Packages:
+        cv2 (pip install cv2)
+    
+    This function is useful for generating thumbnail images from videos.
+    """
+    video_capture = cv2.VideoCapture(video_path)  # Open the video file for reading
+    total_frames = int(video_capture.get(cv2.CAP_PROP_FRAME_COUNT))  # Get the total number of frames in the video
+    middle_frame_index = total_frames // 2  # Calculate the index of the middle frame
+    video_capture.set(cv2.CAP_PROP_POS_FRAMES, middle_frame_index)  # Seek to the middle frame
+    success, frame = video_capture.read()  # Read the middle frame
+    video_capture.release()  # Release the video capture object
+
+    if success:
+        frame = cv2.resize(frame, frame_size)  # Resize the frame to the specified dimensions
+        thumbnail_filename = f"{os.path.basename(video_path)}_thumbnail.jpg"  # Create a filename for the thumbnail
+        cv2.imwrite(thumbnail_filename, frame)  # Save the thumbnail frame as an image
+    else:
+        raise Exception("Could not extract frame")  # Raise an exception if frame extraction fails