import os

def check_headers(directory):
    for filename in os.listdir(directory):
        if filename.endswith(".mp4"):
            filepath = os.path.join(directory, filename)
            try:
                with open(filepath, "rb") as f:
                    header = f.read(16)
                    print(f"{filename[:30]}... : {header}")
            except Exception as e:
                print(f"Error reading {filename}: {e}")

check_headers(r"d:\dsWork\aiData\DouYin\DownloadedVideos")