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优酷真实视频地址解析

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例:http://v.youku.com/v_show/id_XNzk2NTI0MzMy.html

1:获取视频vid

在视频url中标红部分。一个正则表达式即可获取。

string getVid(string url)
{
    string strRegex = "(?<=id_)(w+)";
    Regex reg = new Regex(strRegex);
    Match match = reg.Match(url);
    return match.ToString();
}

2:获取视频元信息

http://v.youku.com/player/getPlayList/VideoIDS/XNzk2NTI0MzMy/Pf/4/ctype/12/ev/1

将前述vid嵌入到上面url中访问即可得到视频信息文件。由于视频信息过长不在此贴出全部内容。下面是部分重要内容的展示。(获取文件为json文件,可直接解析)

{ "data": [ {
            "ip": 996949050,
            "ep": "NQXRTAodIbrd1vnC8+JxB4emuRs41w7DWho=",
            "segs": {
                "hd2": [
                    {
                        "no": "0",
                        "size": "34602810",
                        "seconds": 205,
                        "k": "248fe14b4c1b37302411f67a",
                        "k2": "1c8e113cecad924c5"
                    },
                    {
                        "no": "1",
                    },] }, } ],}

上面显示的内容后面都会使用到。其中segs包含hd3,hd2,flv,mp4,3gp等各种格式,并且每种格式下均分为若干段。本次选用清晰度较高的hd2(视频格式为flv)

3:拼接m3u8地址

http://pl.youku.com/playlist/m3u8?ctype=12&ep={0}&ev=1&keyframe=1&oip={1}&sid={2}&token={3}&type={4}&vid={5}

以上共有6个参数,其中vid和oip已经得到,分别之前的vid和json文件中的ip字段,即(XNzk2NTI0MzMy1991941296),但是ep,sid,token需要重新计算(json文件中的ep值不能直接使用)。type即为之前选择的segs。

3.1计算ep,sid,token

计算方法单纯的为数学计算,下面给出计算的函数。三个参数可一次性计算得到。其中涉及到Base64编码解码知识,点击查看

private static string myEncoder(string a, byte[] c, bool isToBase64)
{
    string result = "";
    List<Byte> bytesR = new List<byte>();
    int f = 0, h = 0, q = 0;
    int[] b = new int[256];
    for (int i = 0; i < 256; i++)
            b[i] = i;
    while (h < 256)
    {
        f = (f + b[h] + a[h % a.Length]) % 256;
        int temp = b[h];
        b[h] = b[f];
        b[f] = temp;
        h++;
    }
    f = 0; h = 0; q = 0;
    while (q < c.Length)
    {
        h = (h + 1) % 256;
        f = (f + b[h]) % 256;
        int temp = b[h];
        b[h] = b[f];
        b[f] = temp;
        byte[] bytes = new byte[] { (byte)(c[q] ^ b[(b[h] + b[f]) % 256]) };
        bytesR.Add(bytes[0]);
        result += System.Text.ASCIIEncoding.ASCII.GetString(bytes);
        q++;
    }
    if (isToBase64)
    {
        Byte[] byteR = bytesR.ToArray();
        result = Convert.ToBase64String(byteR);
    }
    return result;
}
public static void getEp(string vid, string ep, ref string pNew, ref string token, ref string sid)
{
    string template1 = "becaf9be";
    string template2 = "bf7e5f01";
    byte[] bytes = Convert.FromBase64String(ep);
    ep = System.Text.ASCIIEncoding.ASCII.GetString(bytes);
    string temp = myEncoder(template1, bytes, false);
    string[] part = temp.Split('_');
    sid = part[0];
    token = part[1];
    string whole = string.Format("{0}_{1}_{2}", sid, vid, token);
    byte[] newbytes = System.Text.ASCIIEncoding.ASCII.GetBytes(whole);
    epNew = myEncoder(template2, newbytes, true);
}

计算得到ep,token,sid分别为cCaVGE6OUc8H4ircjj8bMiuwdH8KXJZ0vESH/7YbAMZuNaHQmjbTwg==, 3825, 241273717793612e7b085。注意,此时ep并不能直接拼接到url中,需要对此做一下url编码ToUrlEncode(ep)。最终ep为cCaVGE6OUc8H4ircjj8bMiuwdH8KXJZ0vESH%2f7YbAMZuNaHQmjbTwg%3d%3d

3.2视频格式及清晰度

视频格式和选择的segs有密切关系。如本文选择的hd2,格式即为flv,下面是segs,视频格式和清晰度的对照。之前对此部分理解有些偏差,多谢削着苹果走路提醒。

“segs”,”视频格式”,”清晰度”
"hd3", "flv", "1080P"
"hd2", "flv", "超清"
"mp4", "mp4", "高清"
"flvhd", "flv", "高清"
"flv", "flv", "标清"
"3gphd", "3gp", "高清"

3.3拼接地址

最后的m3u8地址为

http://pl.youku.com/playlist/m3u8?ctype=12&ep=cCaVGE6OUc8H4ircjj8bMiuwdH8KXJZ0vESH%2f7YbAMZuNaHQmjbTwg%3d%3d&ev=1&keyframe=1&oip=996949050&sid=241273717793612e7b085&token=3825&type=hd2&vid=XNzk2NTI0MzMy

4:获取视频地址

将上述m3u8文件下载后,其中内容即为真实地址,不过还需要稍微处理一下。部分内容如下:

#EXTM3U
#EXT-X-TARGETDURATION:12
#EXT-X-VERSION:3
#EXTINF:6.006,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=0&ts_end=5.906&ts_seg_no=0&ts_keyframe=1
#EXTINF:5.464,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=5.906&ts_end=11.37&ts_seg_no=1&ts_keyframe=1
#EXTINF:5.505,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=11.37&ts_end=16.875&ts_seg_no=2&ts_keyframe=1
#EXTINF:9.26,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=16.875&ts_end=26.135&ts_seg_no=3&ts_keyframe=1
#EXTINF:11.136,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=26.135&ts_end=37.271&ts_seg_no=4&ts_keyframe=1
#EXTINF:8.258,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=37.271&ts_end=45.529&ts_seg_no=5&ts_keyframe=1
#EXTINF:9.843,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=45.529&ts_end=55.372&ts_seg_no=6&ts_keyframe=1
#EXTINF:10.26,
http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv?ts_start=55.372&ts_end=65.632&ts_seg_no=7&ts_keyframe=1

其中每条url只包含6s左右视频,但是可将url中参数部分去掉即可得到实际的长度。但是每条去掉后需合并一下相同的url,如上述列表可得到url片段

http://59.108.137.14/65666E0ED34581E6B96293A18/0300010F005430BCBA49631468DEFEC61C5678-3A78-37BA-1971-21A0D4EEA0E7.flv

将m3u8中所有的url片段全部下载即可大功告成。

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