不用cdn pc看视频怎么加速

import threading
import requests

def download_file(url, start, end, filename):
    headers = {'Range': f'bytes={start}-{end}'}
    response = requests.get(url, headers=headers, stream=True)
    with open(filename, 'rb+') as f:
        f.seek(start)
        for chunk in response.iter_content(chunk_size=1024):
            if chunk:
                f.write(chunk)

url = 'http://example.com/video.mp4'
file_size = int(requests.head(url).headers['Content-Length'])
part = file_size // 10  # 分成10个部分下载

threads = []
for i in range(10):
    start = i * part
    end = start + part - 1 if i < 9 else file_size - 1
    t = threading.Thread(target=download_file, args=(url, start, end, f'video_part_{i}'))
    threads.append(t)
    t.start()

for t in threads:
    t.join()

# 合并文件部分
with open('video.mp4', 'wb') as f:
    for i in range(10):
        with open(f'video_part_{i}', 'rb') as part_file:
            f.write(part_file.read())
        os.remove(f'video_part_{i}')