视频网站API的需求讨论---扬风科技

在我们实施项目的过程中，一客户提了个需求。就是能不能实现将他们上传到youtube上的视频，实现自动抓取下来，然后自动传到优酷上。

我们仔细研究了下。

 youtube和优酷本身都提供了开发API,但这些API申请后都是对视频本身元数据的访问。也就是可以把他们的视频信息加到我们自己的应用程序里面，包括播放。

但这两个网站本身不支持下载和上传的API.

两个网站的数据格式都是json数据。

但两个API都没有提供下载和上传功能。

所以我们找到一些变通的可以下载youtube网站视频的解决方法

public class YouTubeDownloader
{
    public static List<YouTubeVideoQuality> GetYouTubeVideoUrls(params string[] VideoUrls)
    {
        List<YouTubeVideoQuality> urls = new List<YouTubeVideoQuality>();
        foreach (var VideoUrl in VideoUrls)
        {
            string html = Helper.DownloadWebPage(VideoUrl);
            string title = GetTitle(html);
            foreach (var videoLink in ExtractUrls(html))
            {
                YouTubeVideoQuality q = new YouTubeVideoQuality();
                q.VideoUrl = VideoUrl;
                q.VideoTitle = title;
                q.DownloadUrl = videoLink + "&title=" + title;
                if (getQuality(q))
                    urls.Add(q);
            }
        }
        return urls;
    }

    private static string GetTitle(string RssDoc)
    {
        string str14 = Helper.GetTxtBtwn(RssDoc, "'VIDEO_TITLE': '", "'", 0);
        if (str14 == "") str14 = Helper.GetTxtBtwn(RssDoc, "\"title\" content=\"", "\"", 0);
        if (str14 == "") str14 = Helper.GetTxtBtwn(RssDoc, "&title=", "&", 0);
        str14 = str14.Replace(@"\", "").Replace("'", "&#39;").Replace(
                "\"", "&quot;").Replace("<", "&lt;").Replace(
                ">", "&gt;").Replace("+", " ");
        return str14;
    }


    private static List<string> ExtractUrls(string html)
    {
        html = Uri.UnescapeDataString(Regex.Match(html, "url_encoded_fmt_stream_map=(.+?)&",
                                      RegexOptions.Singleline).Groups[1].ToString());
        MatchCollection matchs = Regex.Matches(html,
          "url=(.+?)&quality=(.+?)&fallback_host=(.+?)&type=(.+?)&itag=(.+?),",
          RegexOptions.Singleline);
        bool firstTry = matchs.Count > 0;
        if (!firstTry)
            matchs = Regex.Matches(html,
                     "itag=(.+?)&url=(.+?)&type=(.+?)&fallback_host=(.+?)&sig=(.+?)&quality=(.+?),{0,1}",
                     RegexOptions.Singleline);
        List<string> urls = new List<string>();
        foreach (Match match in matchs)
        {
            if (firstTry)
                urls.Add(Uri.UnescapeDataString(match.Groups[1] + ""));
            else urls.Add(Uri.UnescapeDataString(match.Groups[2] + "") + "&signature=" + match.Groups[5]);
        }
        return urls;
    }

    private static bool getQuality(YouTubeVideoQuality q)
    {
        if (q.DownloadUrl.Contains("itag=5"))
            q.SetQuality("flv", new Size(320, 240));
        else if (q.DownloadUrl.Contains("itag=34"))
            q.SetQuality("flv", new Size(400, 226));
        else if (q.DownloadUrl.Contains("itag=6"))
            q.SetQuality("flv", new Size(480, 360));
        else if (q.DownloadUrl.Contains("itag=35"))
            q.SetQuality("flv", new Size(640, 380));
        else if (q.DownloadUrl.Contains("itag=18"))
            q.SetQuality("mp4", new Size(480, 360));
        else if (q.DownloadUrl.Contains("itag=22"))
            q.SetQuality("mp4", new Size(1280, 720));
        else if (q.DownloadUrl.Contains("itag=37"))
            q.SetQuality("mp4", new Size(1920, 1280));
        else if (q.DownloadUrl.Contains("itag=38"))
            q.SetQuality("mp4", new Size(4096, 72304));
        else return false;
        return true;
    }
}

但是

往优酷上上传视频的方法还没找到解决方案，继续探索中。

 

扬风科技   http://www.yofotech.com