public string strBLUrl(string strVid)
{
System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
long t = (DateTime.Now.Ticks - startTime.Ticks) / 10000; //除10000调整为13位
string ptime = t.ToString();
string vid = strVid;
string s = "format=json&ptime=" + ptime + "&vid=" + strVid + "Ur4a8Jn7XU";
string strQM = s.Sha1Sign().ToUpper();
Dictionary <String, String> DATA = new Dictionary <String, String>();
DATA.Add("vid", vid);
DATA.Add("ptime", ptime);
DATA.Add("sign", strQM);
DATA.Add("format", "json");
// DATA.Add("userid", "33074c0252");
string strFileAPIRegUrl = "http://api.polyv.net/v2/video/33074c0252/get-video-msg?format=json&vid=" + vid + "&ptime=" + ptime + "&sign=" + strQM;
string st = CommonHelp.HttpGet(strFileAPIRegUrl);
JObject wigdata = JObject.Parse(st);
JArray categories = JArray.Parse(wigdata["data"].ToString());
string strMP4 = (string)categories[0]["mp4_1"];
return(strMP4);
}