get_video_info 仅适用于允许在其他网站作为嵌入视频观看的视频。我在 get_video_info 上苦苦挣扎，但可以找到任何 vevo 的解决方案。但是我能够通过检索实际的视频页面使其工作，在实际的视频页面中，您必须获取播放器版本并点击 url（在代码中指定）以获取流链接和实际签名。
youtube 将来可能会改变这一点，但今天以下解决方案对我来说非常有用。
它的c#你应该知道如何将它转换成object-C，下面代码的入口点是ExtractUrls函数，记得传递给它视频页面的html。
例如http://www.youtube.com/watch?v=J5iS3tULXMQ&nomobile=1的html内容
private static List<string> ExtractUrls(string html)
{
string Player_Version = Regex.Match(html, @"""\\/\\/s.ytimg.com\\/yts\\/jsbin\\/html5player-(.+?)\.js""").Groups[1].ToString();
string Player_Code = new WebClient().DownloadString("http://s.ytimg.com/yts/jsbin/" + "html5player-" + Player_Version + ".js");
html = Uri.UnescapeDataString( Regex.Match(html, @"""url_encoded_fmt_stream_map"":\s+""(.+?)""", RegexOptions.Singleline).Groups[1].ToString());
var Streams = Regex.Matches(html, @"(^url=|(\\u0026url=|,url=))(.+?)(\\u0026|,|$)");
var Signatures = Regex.Matches(html, @"(^s=|(\\u0026s=|,s=))(.+?)(\\u0026|,|$)");
List<string> urls = new List<string>();
for (int i = 0; i < Streams.Count - 1; i++)
{
string URL = Streams[i].Groups[3].ToString();
if (Signatures.Count > 0)
{
string Sign = Sign_Decipher(Signatures[i].Groups[3].ToString(), Player_Code);
URL += "&signature=" + Sign;
}
urls.Add(URL.Trim());
}
return urls;
}
public static string Sign_Decipher(string s, string Code)
{
string Function_Name = Regex.Match(Code, @"signature=(\w+)\(\w+\)").Groups[1].ToString();
var Function_Match = Regex.Match(Code, "function " + Function_Name + @"\((\w+)\)\{(.+?)\}",RegexOptions.Singleline);
string Var = Function_Match.Groups[1].ToString();
string Decipher = Function_Match.Groups[2].ToString();
var Lines = Decipher.Split(';');
for (int i = 0; i < Lines.Length; i++)
{
string Line = Lines[i].Trim();
if (Regex.IsMatch(Line, Var + "=" + Var + @"\.reverse\(\)"))
{
char[] charArray = s.ToCharArray();
Array.Reverse(charArray);
s = new string(charArray);
}
else if (Regex.IsMatch(Line, Var + "=" + Var + @"\.slice\(\d+\)"))
{
s = Slice(s, Convert.ToInt32(Regex.Match(Line, Var + "=" + Var + @"\.slice\((\d+)\)").Groups[1].ToString()));
}
else if (Regex.IsMatch(Line, Var + @"=\w+\(" + Var + @",\d+\)"))
{
s = Swap(s, Convert.ToInt32(Regex.Match(Line, Var + @"=\w+\(" + Var + @",(\d+)\)").Groups[1].ToString()));
}
else if (Regex.IsMatch(Line, Var + @"\[0\]=" + Var + @"\[\d+%" + Var + @"\.length\]"))
{
s = Swap(s, Convert.ToInt32(Regex.Match(Line, Var + @"\[0\]=" + Var + @"\[(\d+)%" + Var + @"\.length\]").Groups[1].ToString()));
}
}
return s;
}
private static string Slice(string Input, int Length)
{
return Input.Substring(Length, Input.Length - 1);
}
private static string Swap(string Input, int Position)
{
var Str = new StringBuilder(Input);
var SwapChar = Str[Position];
Str[Position] = Str[0];
Str[0] = SwapChar;
return Str.ToString();
}
感谢this code project artical下的cmets