以虎牙视频播放页地址 http://v.huya.com/play/3474405.html 为例，说说如何得到视频的真实地址。

提取视频ID

视频ID（vid）可以从播放页地址中得到，上述播放页地址对应的视频ID就是3474405.

请求接口

通过浏览器开发者工具的网络监测，我们发现如下接口：

http://playapi.v.duowan.com/index.php?r=play%2Fvideo&vid=3474405&partner=

请求该接口返回的是JSON格式数据：

{
  "code": 1,
  "message": "success",
  "result": {
    "cover": "http://vimg.dwstatic.com/1644/3474405/3.jpg",
    "vr": false,
    "channel": "df",
    "items": [
      {
        "transcode_id": "5897886",
        "vid": "3474405",
        "task_id": "5790225",
        "video_name": "3474405-102-1478215562.mp4",
        "task_name": "原画(不转码)",
        "status": "1",
        "can_play": "1",
        "format": "",
        "definition": "yuanhua",
        "size": "62741992",
        "width": "1280",
        "height": "720",
        "duration": "229.016000",
        "bitrate": "2191706",
        "cover": "",
        "md5": "",
        "path": "1644/",
        "transcode": {
          "transcode_id": "5897886",
          "video_name": "3474405-102-1478215562.mp4",
          "size": "62741992",
          "width": "1280",
          "height": "720",
          "duration": "229.016000",
          "path": "1644/",
          "urls": [
            "http://w5.dwstatic.com/54/8/1644/3474405-102-1478215562.mp4",
            "http://w5.dwstatic.com/54/8/1644/3474405-102-1478215562.mp4",
            "http://w5.dwstatic.com/54/8/1644/3474405-102-1478215562.mp4",
            "http://w5.dwstatic.com/54/8/1644/3474405-102-1478215562.mp4"
          ]
        }
      },
      {
        "transcode_id": "5897889",
        "vid": "3474405",
        "task_id": "5790226",
        "video_name": "3474405-98-1478215563.mp4",
        "task_name": "流畅",
        "status": "1",
        "can_play": "1",
        "format": "",
        "definition": "350",
        "size": "8393817",
        "width": "640",
        "height": "360",
        "duration": "229.085000",
        "bitrate": "293124",
        "cover": "",
        "md5": "",
        "path": "1644/",
        "transcode": {
          "transcode_id": "5897889",
          "video_name": "3474405-98-1478215563.mp4",
          "size": "8393817",
          "width": "640",
          "height": "360",
          "duration": "229.085000",
          "path": "1644/",
          "urls": [
            "http://w5.dwstatic.com/52/11/1644/3474405-98-1478215563.mp4",
            "http://w5.dwstatic.com/52/11/1644/3474405-98-1478215563.mp4",
            "http://w5.dwstatic.com/52/11/1644/3474405-98-1478215563.mp4",
            "http://w5.dwstatic.com/52/11/1644/3474405-98-1478215563.mp4"
          ]
        }
      },
      {
        "transcode_id": "5897890",
        "vid": "3474405",
        "task_id": "5790227",
        "video_name": "3474405-99-1478215563.mp4",
        "task_name": "高清",
        "status": "1",
        "can_play": "1",
        "format": "",
        "definition": "1000",
        "size": "15304327",
        "width": "960",
        "height": "540",
        "duration": "229.085000",
        "bitrate": "534450",
        "cover": "",
        "md5": "",
        "path": "1644/",
        "transcode": {
          "transcode_id": "5897890",
          "video_name": "3474405-99-1478215563.mp4",
          "size": "15304327",
          "width": "960",
          "height": "540",
          "duration": "229.085000",
          "path": "1644/",
          "urls": [
            "http://w5.dwstatic.com/53/11/1644/3474405-99-1478215563.mp4",
            "http://w5.dwstatic.com/53/11/1644/3474405-99-1478215563.mp4",
            "http://w5.dwstatic.com/53/11/1644/3474405-99-1478215563.mp4",
            "http://w5.dwstatic.com/53/11/1644/3474405-99-1478215563.mp4"
          ]
        }
      },
      {
        "transcode_id": "5897891",
        "vid": "3474405",
        "task_id": "5790228",
        "video_name": "3474405-100-1478215563.mp4",
        "task_name": "超清",
        "status": "1",
        "can_play": "1",
        "format": "",
        "definition": "1300",
        "size": "27177273",
        "width": "1280",
        "height": "720",
        "duration": "229.085000",
        "bitrate": "949072",
        "cover": "",
        "md5": "",
        "path": "1644/",
        "transcode": {
          "transcode_id": "5897891",
          "video_name": "3474405-100-1478215563.mp4",
          "size": "27177273",
          "width": "1280",
          "height": "720",
          "duration": "229.085000",
          "path": "1644/",
          "urls": [
            "http://w5.dwstatic.com/55/8/1644/3474405-100-1478215563.mp4",
            "http://w5.dwstatic.com/55/8/1644/3474405-100-1478215563.mp4",
            "http://w5.dwstatic.com/55/8/1644/3474405-100-1478215563.mp4",
            "http://w5.dwstatic.com/55/8/1644/3474405-100-1478215563.mp4"
          ]
        }
      }
    ],
    "code": {
      "swf": "http://assets.dwstatic.com/video/vppp.swf?vid=3474405&auto_play=1&channelId=df&logo=huya",
      "html": "<embed id=\"3474405\" name=\"3474405\" src=\"http://assets.dwstatic.com/video/vppp.swf\" wmode=\"transparent\" allowFullScreen=\"true\" quality=\"high\"  height=\"498\"  width=\"610\" align=\"middle\" allowScriptAccess=\"always\" flashvars=\"auto_play=1&vid=3474405&channelId=df&logo=huya\" type=\"application/x-shockwave-flash\">\t</embed> ",
      "url": "http://v.huya.com/play/3474405.html"
    }
  }
}

items列表中包含了各个清晰度视频的相关信息。可以看到，共有原画、流畅、高清和超清这4种码流。每种码流中的urls就是视频的真实地址。

Python代码示例

import requests
import json
import re
import random

vid = re.search(r'/play/(.*).html', 'http://v.huya.com/play/3474405.html').group(1)
play_api = 'http://playapi.v.duowan.com/index.php?partner=&r=play/video&vid=%s' % vid
r = requests.get(play_api)
data = json.loads(r.content)
for item in data['result']['items']:
    definition = item['task_name']
    urls = item['transcode']['urls']
    print definition
    print random.choice(urls)

运行结果：

原画(不转码)
http://w5.dwstatic.com/54/8/1644/3474405-102-1478215562.mp4
流畅
http://w5.dwstatic.com/52/11/1644/3474405-98-1478215563.mp4
高清
http://w5.dwstatic.com/53/11/1644/3474405-99-1478215563.mp4
超清
http://w5.dwstatic.com/55/8/1644/3474405-100-1478215563.mp4