我正在尝试在我的应用程序中播放 YouTube 视频。一切正常。但是，当我尝试观看包含 Vevo 内容的视频时，它失败了。

我也曾尝试在 get_video_info 中传递 el=vevo:

http://www.youtube.com/get_video_info?video_id=uuZE_IRwLNI&el=vevo&ps=default&eurl=&gl=US&hl=en

stream

 {
    "fallback_host" = "tc.v12.cache7.googlevideo.com";
    itag = 22;
    quality = hd720;
    s = "8E6E5D13EB65FB653B173B94CB0BCC3A20853F5EDE8.5E2E87DF33EEDE165FEA90109D3C7D5DADA06B6BB60";
    type = "video/mp4; codecs=\"avc1.64001F, mp4a.40.2\"";
    url = "http://r7---sn-cvh7zn7r.googlevideo.com/videoplayback?pcm2fr=yes&sver=3&expire=1393773646&itag=22&id=bae644fc84702cd2&upn=SjZd81MudQs&sparams=gcr%2Cid%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Cratebypass%2Csource%2Cupn%2Cexpire&ms=au&gcr=in&mt=1393747698&source=youtube&ratebypass=yes&ipbits=0&fexp=935620%2C919120%2C912523%2C932288%2C914084%2C916626%2C937417%2C937416%2C913434%2C932289%2C936910%2C936913%2C902907&mv=m&key=yt5&ip=103.250.162.79";
}

当我使用 url 时，它没有播放。有什么解决办法吗？

最佳答案

get_video_info 仅适用于允许在其他网站中作为嵌入视频观看的视频。我在 get_video_info 上苦苦挣扎，但可以为 vevo 找到任何解决方案。但是我能够通过检索实际视频页面使其工作，在实际视频页面中，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效果很好。

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，记得把视频页面的html传给它。

例如http://www.youtube.com/watch?v=J5iS3tULXMQ&nomobile=1

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();
}

致谢 this code project artical 下的评论

关于ios - YouTube : This video contains content from vevo?，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22125353/