CNTV的点播调度方式

来源：互联网发布：mac修改桌面图标大小编辑：程序博客网时间：2024/05/16 08:56

研究了下CNTV的点播调度方式，以2016央视春晚]小品《将军与士兵》视频为例。

页面地址：http://chunwan.cntv.cn/2016/02/11/VIDE0DEeKsIGwlmOPWcNWcuY160211.shtml

1、用浏览器自带的开发者工具，查看浏览器加载的url请求，找到调度请求 http://vdn.apps.cntv.cn/api/getHttpVideoInfo.do?pid=813f69ca643a4a83b6e8f26db3fdab5b&tz=-8&from=000news&url=http://chunwan.cntv.cn/2016/02/11/VIDE0DEeKsIGwlmOPWcNWcuY160211.shtml&idl=32&idlr=32&modifyed=false

2、用浏览器打开调度请求，结果如下

{

ack: "yes",
tag: "",
title: "[2016央视春晚]小品《将军与士兵》表演者：侯勇、句号、于恒（字幕版）",
play_channel: "CCTV-1高清",
produce: "",
editer_name: "yangwen",
produce_id: "wxsb01",
column: "2016央视春晚高清精切",
f_pgmtime: "2016-02-11 21:02:55",
cdn_info:
{
- cdn_vip: "vod.cntv.lxdns.com",
- cdn_code: "VOD-MP4-CDN-CNC",
- cdn_name: "3rd网宿"
},
video:
{
- totalLength: "848.00",
- lowChapters:
  [
  - {
    duration: "599",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264200000nero_aac16-1.mp4"
    },
  - {
    duration: "249",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264200000nero_aac16-2.mp4"
    }
  ],
- chapters:
  [
  - {
    duration: "298",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264418000nero_aac32-1.mp4"
    },
  - {
    duration: "300",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264418000nero_aac32-2.mp4"
    },
  - {
    duration: "249",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264418000nero_aac32-3.mp4"
    }
  ],
- chapters2:
  [
  - {
    duration: "178",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-1.mp4"
    },
  - {
    duration: "179",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-2.mp4"
    },
  - {
    duration: "181",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-3.mp4"
    },
  - {
    duration: "179",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-4.mp4"
    },
  - {
    duration: "129",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-5.mp4"
    }
  ],
- chapters3:
  [
  - {
    duration: "119",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-1.mp4"
    },
  - {
    duration: "120",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-2.mp4"
    },
  - {
    duration: "119",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-3.mp4"
    },
  - {
    duration: "119",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-4.mp4"
    },
  - {
    duration: "120",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-5.mp4"
    },
  - {
    duration: "120",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-6.mp4"
    },
  - {
    duration: "119",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-7.mp4"
    },
  - {
    duration: "9",
    image: "http://p1.img.cctvpic.com/fmspic/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b-420.jpg",
    url: "http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h2641200000nero_aac16-8.mp4"
    }
  ],
- validChapterNum: 4,
- url: ""
},
hls_cdn_info:
{
- cdn_vip: "asp.cntv.lxdns.com",
- cdn_code: "VOD-HLS-CDN-CNC",
- cdn_name: "3rd网宿"
},
hls_url: "http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/813f69ca643a4a83b6e8f26db3fdab5b/main.m3u8?maxbr=1200",
asp_error_code: "0",
client_sid: "dfd53a5a-d5ee-11e5-a80f-0050568986d6",
public: "1",
is_invalid_copyright: "0",
is_protected: "0",
is_fn_hot: "true",
is_p2p_use: true,
default_stream: "SD",
lc:
{
- isp_code: "0",
- city_code: "",
- provice_code: "BJ",
- country_code: "CN",
- ip: "221.123.166.154"
},
is_ipad_support: "true",
version: "0.2",
embed: "",
is_fn_multi_stream: false

}

从以上可以看出，CDN返回为网宿，chapters 为多码率，不同码率分段不同，高码率分段较多，低码率分段较少

3、从浏览器开发者工具中，看到浏览器解下来会请求

http://vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-1.mp4?start=72

可以看到，此请求是请求到网宿的。（lxdns.com为网宿域名），此请求返回结果为302，重定向到

http://218.26.67.22/vod.cntv.lxdns.com/flash/mp4video48/TMS/2016/02/11/813f69ca643a4a83b6e8f26db3fdab5b_h264818000nero_aac32-1.mp4?start=72&wshc_tag=0&wsts_tag=56c535fb&wsid_tag=dd7ba69a&wsiphost=ipdbm

浏览器接着请求重定向地址，获取视频。

4、根据以上情况，判定CNTV的调度方式为

a、用户先访问CNTV调度API，从调度API获取分配服务的CDN，分配方式为按照用户的IP地址分配

b、用户访问CDN的调度API（或称为GLSB），调度API通过302方式返回服务节点地址，302返回的服务节点依托于用户的IP地址

c、用户根据节点地址拼出访问url，到CDN边缘节点获取服务

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