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YouTube Downloader Using C# .NET

By , 6 Mar 2014
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Attached new version Smile | :) .

Introduction

This article shows how to download YouTube videos using C# code only. The code is very simple to understand and anyone can easily integrate it to in their solution or project.

I didn't use any third party library to do this task. All you need is to take two .cs files and integrate them to your project.

Using the code

There are two main classes in this project:

YouTubeVideoQuality Class

This is the entity that describes the video.

public class YouTubeVideoQuality 
{
    /// <summary>
    /// Gets or Sets the file name
    /// </summary>
    public string VideoTitle { get; set; }
    /// <summary>
    /// Gets or Sets the file extention
    /// </summary>
    public string Extention { get; set; }
    /// <summary>
    /// Gets or Sets the file url
    /// </summary>
    public string DownloadUrl { get; set; }
    /// <summary>
    /// Gets or Sets the youtube video url
    /// </summary>
    public string VideoUrl { get; set; }
    /// <summary>
    /// Gets or Sets the file size
    /// </summary>
    public Size Dimension { get; set; }

    public override string ToString()
    {
        return Extention + " File " + Dimension.Width + 
                           "x" + Dimension.Height;
    }

    public void SetQuality(string Extention, Size Dimension)
    {
        this.Extention = Extention;
        this.Dimension = Dimension;
    }
}

YouTubeDownloader Class

This class downloads YouTube videos:

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;
    }
}

Points of Interest

Using this code you can select the video quality depending in your internet connection speed to start download.

Many people have slow internet connections and they can not watch videos from YouTube, so I made this code to help those people to download YouTube videos to their PC's so they can watch the videos offline.

Updates

Thanks to Motaz Alnuweiri, the Downloader works again. Added self download videos.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

akramKamal
Software Developer Desktop Team
Palestinian Territory (Occupied) Palestinian Territory (Occupied)
I have advanced skills in desktop apps development, i have built many apps for many corporations.
 
i'm using the follow languages in my work:
1- C# Language.
2- VB6 Language.
3- Asp.net using C#.
4- Crystal Reports.
 
i have more than 7 experience years in coding and programming.
 
Systems and apps Developed by Us:
1-E-Archive System (VB6,Supports multi DataBase Engins).
2-SMS System (Multi languages such VB6,C#,Asp.Net and Gizmox).
3-Multi Camera Monitor System-Motion Detection and record(C#).
4-Administrative Evaluation System (Asp.net).
5-E-Clinic System (C#-using my business layer generator,Supports multi DataBase Engines).
6-Data Access Layer Generator Framework(C#).
7-Sip Provider -VOIP- Softphone (C#- for Italian company).
8-Training course Manager System(C#-for UCAS).
9-Computer Exam System (VB6,Oracle DataBase).
10-Dialer System (VB6).
11-Implement Google API using C# (Translation and web Search).
12-Print Management Enterprise(C#)
13-Elections System (C#- using my business layer generator).
14-Advanced English competition (VB6).
15-Remote USB Sharing (C/C++,VB6).
16-Watch Attendance (C/C++,VB6).
17-Tube Spy (C#).
18-AdminYourTube (C#)
19- Transport Reservation System (C#,Asp.net,Ajax,Jquery)
 
Please visit my elance URL http://ashrafnet.elance.com

Comments and Discussions

 
QuestionLink error Pinmemberbzsolt916-Jan-13 17:04 
AnswerRe: Link error PinmemberCircleDock6-Jan-13 19:09 

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