下载抖音 链接视频 源代码 python

### Python 实现抖音视频下载

为了实现从抖音平台下载视频的功能，可以采用如下方法：

#### 方法一：通过解析 URL 获取视频 ID 并构建请求

import requests

def download_douyin_video(url, output_path='output.mp4'):
    # 解析链接获取视频ID
    video_id = url.split('/')[-1].split('?')[0]  # 去除可能存在的查询参数[^1]

    share_url = f"https://www.iesdouyin.com/share/video/{video_id}/"
    
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
        'Referer': 'https://www.douyin.com/'
    }
    
    response = requests.get(share_url, headers=headers)
    play_addr = None
    
    if "playAddr" in response.text:
        import re
        match = re.search(r'playAddr: "(.*?)"', response.text)
        if match is not None:
            play_addr = match.group(1).replace('\\u002F', '/').replace('playwm', 'play')  # 移除水印标志
            
    if play_addr:
        r = requests.get(play_addr, stream=True, headers=headers)
        
        with open(output_path, 'wb') as fd:
            for chunk in r.iter_content(chunk_size=1024):
                fd.write(chunk)

download_douyin_video("https://v.douyin.com/example/")

这段代码展示了如何利用正则表达式提取网页中的实际播放地址，并去除其中的`watermark`(水印)标记。注意这里的URL需要替换为真实的分享页面链接。

#### 方法二：直接访问 API 接口获取视频信息
另一种更高效的方式是调用官方API接口来获得更加精确的数据结构：

from urllib.parse import urlparse, parse_qs
import json

def get_video_info(short_code):
    api_endpoint = "https://api.amemv.com/aweme/v1/feed/"
    params = {"sec_uid": "", "count": "1", "max_cursor": "0", "aid": "1128"}
    
    parsed = urlparse(f'https://v.douyin.com/{short_code}')
    query_dict = parse_qs(parsed.query)
    
    aweme_id = short_code or query_dict.get('vid',[None])[0]
    
    payload={
      "device_platform":"web",
      "version_name":"23.5.0",
      "_signature":"",
       "iid":"",
       "idfa":"",
       "openudid":"",
       "uuid":"",
       "os_version":"",
       "screen_width":"",
       "dpi":"",
       "app_name":"aweme",
       "channel":"App%20Store",
       "manifest_version_code":"970",
       "resolution":"",
       "ac":"wifi",
       "uid":"",
       "vc":"2350",
       "language":"zh",
       "region":"CN",
       "update_version_uri":"/upgrade/?did=",
       "ssmix":"a",
       "as":"a1qwertdfghjklzxcvb",
       "ts":""}
       
    resp = requests.post(api_endpoint,params=params,data=payload)
    data = resp.json()
    
    try:
        item_list=data["aweme_list"]
        first_item=item_list[0]["video"]["play_addr"]["url_list"][0]
        return first_item.replace('/playwm/', '/play/')  # 替换掉带水印版本
    except Exception as e:
        print(e)
        return ""

get_video_info("example")  

此函数会尝试连接至指定的服务端点并发送POST请求以检索目标短视频的相关详情。成功接收到响应之后再从中抽取所需的媒体文件路径。