How to create thumbnail of a video in python using OpenCV & moviepy

create_thumbnail.py

from dotenv import load_dotenv
from moviepy import VideoFileClip
import cv2

def create_thumbnail(file) -> None:
    video = VideoFileClip(f"{os.getenv('path/to/video.mp4')}") # Get the video from storage.
    filenoext = file.rsplit('.', 1)[0] # Get the filename without the extension ['mp4', 'mov', 'mkv', etc.]
    get_frame = video.get_frame(3) # Get the 3rd frame from the video. You can choose the frame you need. Getting a single frame from the video helps in memory efficiency as the video doesn't need to be loaded in memory completely. 
    cv2.imwrite(f"{os.getenv('path/to/save/image.jpg')}", get_frame) # Save the frame to the desired path.
    # Don't load the whole video in memory unless it's a lightweight video.