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YouTube Downloader Using C# .NET

, 7 Feb 2015 CPOL
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Full C# code to download videos from YouTube in any quality.

Thanks everyone for your help in this project, your comments and suggests were very helpful for the project.

A new version of YouTube Downloader is released on 08 Feb 2015

Introduction

This tip shows how to download YouTube videos using C# code only. The code is very simple to understand and anyone can easily integrate it 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 youtube video size
        /// </summary>
        public long VideoSize { get; set; }
        /// <summary>
        /// Gets or Sets the youtube video dimension
        /// </summary>
        public Size Dimension { get; set; }
        /// <summary>
        /// Gets the youtube video length
        /// </summary>
        public long Length { get; set; }
        public override string ToString()
        {
            string videoExtention = this.Extention;
            string videoDimension = formatSize(this.Dimension);
            string videoSize = String.Format
            (new FileSizeFormatProvider(), "{0:fs}", this.VideoSize);

            return String.Format
            ("{0} ({1}) - {2}", videoExtention.ToUpper(), videoDimension, videoSize);
        }

        private string formatSize(Size value)
        {
            string s = value.Height >= 720 ? " HD" : "";
            return ((Size)value).Width + " x " + value.Height + s;
        }
    }

YouTubeDownloader Class

This class downloads YouTube videos:

  public static class YouTubeDownloader
    {
        public static List<YouTubeVideoQuality> GetYouTubeVideoUrls(string VideoUrl)
        {
            var list = new List<YouTubeVideoQuality>();

            var id = YouTubeDownloader.GetVideoIDFromUrl(VideoUrl);
            var infoUrl = string.Format
            ("http://www.youtube.com/get_video_info?&video_id=
            {0}&el=detailpage&ps=default&eurl=&gl=US&hl=en", id);
            var infoText = new WebClient().DownloadString(infoUrl);
            var infoValues = HttpUtility.ParseQueryString(infoText);
            var title = infoValues["title"];
            var videoDuration = infoValues["length_seconds"];
            var videos = infoValues["url_encoded_fmt_stream_map"].Split(',');
            foreach (var item in videos)
            {
                try
                {
                    var data = HttpUtility.ParseQueryString(item);
                    var server = Uri.UnescapeDataString(data["fallback_host"]);
                    var url = Uri.UnescapeDataString(data["url"]) + 
                    "&fallback_host=" + server;
                    var size = getSize(url);
                    var videoItem = new YouTubeVideoQuality();
                    videoItem.DownloadUrl = url;
                    videoItem.VideoSize = size;
                    videoItem.VideoTitle = title;
                    var tagInfo = new ITagInfo(Uri.UnescapeDataString(data["itag"]));
                    videoItem.Dimension = tagInfo.VideoDimensions;
                    videoItem.Extention = tagInfo.VideoExtentions;
                    videoItem.Length = long.Parse(videoDuration);
                    list.Add(videoItem);
                }
                catch { }
            }

            return list;
        }

        private static long getSize(string videoUrl)
        {
            HttpWebRequest fileInfoRequest = (HttpWebRequest)HttpWebRequest.Create(videoUrl);
            fileInfoRequest.Proxy = Helper.InitialProxy();
            HttpWebResponse fileInfoResponse = (HttpWebResponse)fileInfoRequest.GetResponse();
            long bytesLength = fileInfoResponse.ContentLength;
            fileInfoRequest.Abort();
            return bytesLength;
        }

        /// <summary>
        /// Get the ID of a youtube video from its URL
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetVideoIDFromUrl(string url)
        {
            url = url.Substring(url.IndexOf("?") + 1);
            char[] delimiters = { '&', '#' };
            string[] props = url.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);

            string videoid = "";
            foreach (string prop in props)
            {
                if (prop.StartsWith("v="))
                {
                    videoid = prop.Substring(prop.IndexOf("v=") + 2);
                }
            }

            return videoid;
        }
    }

ITagInfo struct

This struct defines the itag information for videos:

 public struct ITagInfo
    {
        const string itagExtentions = "5=flv,6=flv,17=3gp,18=mp4,22=mp4,34=flv,
        35=flv,36=3gp,37=mp4,38=mp4,43=webm,44=webm,45=webm,46=webm,82=3D.mp4,83=3D.mp4,
        84=3D.mp4,85=3D.mp4,100=3D.webm,101=3D.webm,102=3D.webm,120=live.flv";
        const string itagWideDimensions = "5=320x180,6=480x270,17=176x99,18=640x360,
        22=1280x720,34=640x360,35=854x480,36=320x180,37=1920x1080,38=2048x1152,43=640x360,
        44=854x480,45=1280x720,46=1920x1080,82=480x270,83=640x360,84=1280x720,85=1920x1080,
        100=640x360,101=640x360,102=1280x720,120=1280x720";
        const string itagDimensions = "5=320x240,6=480x360,17=176x144,18=640x480,
        22=1280x960,34=640x480,35=854x640,36=320x240,37=1920x1440,38=2048x1536,43=640x480,
        44=854x640,45=1280x960,46=1920x1440,82=480x360,83=640x480,84=1280x960,85=1920x1440,
        100=640x480,101=640x480,102=1280x960,120=1280x960";

        public ITagInfo(string iTag)
            : this()
        {
            iTag = (iTag + "").Trim();
            foreach (var item in itagExtentions.Split(','))
            {
                var nameValue = item.Split('=');
                if (nameValue[0] != iTag) continue;
                VideoExtentions = nameValue[1];
            }
            foreach (var item in itagWideDimensions.Split(','))
            {
                var nameValue = item.Split('=');
                if (nameValue[0] != iTag) continue;
                var widthAndHeight = nameValue[1].Split('x');
                VideoDimensions = new Size(int.Parse(widthAndHeight[0]), 
                int.Parse(widthAndHeight[1]));
            }
        }
        /// <summary>
        /// Gets the Video Extentions that belong to itag
        /// </summary>
        public string VideoExtentions { get; private set; }
        /// <summary>
        /// Gets the Video Dimensions that belong to itag
        /// </summary>
        public Size VideoDimensions { get; private set; }
    }

Points of Interest

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

Many people have slow internet connections and they cannot watch videos from YouTube, so I made this code to help those people to download YouTube videos to their PCs 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)

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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

 
NewsImproved version [modified] PinmemberMotaz Alnuweiri27-Nov-12 23:48 
GeneralRe: Improved version PinmemberakramKamal28-Nov-12 0:17 
GeneralRe: Improved version [modified] PinmemberMotaz Alnuweiri28-Nov-12 1:24 
GeneralRe: Improved version PinmemberakramKamal28-Nov-12 5:51 
GeneralRe: Improved version PinmemberCeyhun Emre Bozkurt1-Aug-13 12:40 
GeneralRe: Improved version PinmemberMotaz Alnuweiri1-Aug-13 18:24 
GeneralRe: Improved version PinmemberCeyhun Emre Bozkurt1-Aug-13 23:42 
GeneralRe: Improved version PinmemberMotaz Alnuweiri2-Aug-13 4:52 
GeneralRe: Improved version PinmemberCeyhun Emre Bozkurt3-Aug-13 3:42 
GeneralMy vote of 5 [modified] Pinmembernabilchaoui13-Nov-12 10:31 
GeneralRe: My vote of 5 PinmemberakramKamal14-Nov-12 0:44 
QuestionNot working PinmemberF. ARO3-Nov-12 5:50 
AnswerRe: Not working PinmemberakramKamal3-Nov-12 7:02 
GeneralRe: Not working PinmemberF. ARO4-Nov-12 4:17 
I don't know , your application was working great , now it doesn't work ,
Without doing any change in ur Code!
When the link is opened is the browser ,
No downloads starts , and the webpage response is that i don't have permission to acces the file , do i need any credentials? Username and password to continue and download the videos ?
I there another better class ? This one not working ! Thank you !
GeneralRe: Not working PinmemberakramKamal4-Nov-12 5:50 
GeneralRe: Not working PinmemberF. ARO4-Nov-12 8:57 
GeneralRe: Not working PinmemberakramKamal4-Nov-12 10:56 
GeneralMy vote of 5 PinmemberJustinoScalabitano30-Oct-12 0:48 
Questionits really great Pinmembersmaker21-Oct-12 9:54 
AnswerRe: its really great PinmemberakramKamal21-Oct-12 10:47 
GeneralMy vote of 5 Pinmembergeekbond17-Oct-12 5:44 
QuestionBookmarked ! PinmemberGun Gun Febrianza16-Oct-12 17:43 
AnswerRe: Bookmarked ! PinmemberakramKamal17-Oct-12 3:09 
GeneralRe: Bookmarked ! PinmemberGun Gun Febrianza17-Oct-12 22:33 
GeneralRe: Bookmarked ! PinmemberakramKamal18-Oct-12 6:10 
GeneralRe: Bookmarked ! PinmemberGun Gun Febrianza19-Oct-12 2:17 
GeneralRe: Bookmarked ! PinmemberakramKamal19-Oct-12 3:03 
GeneralRe: Bookmarked ! PinmemberGun Gun Febrianza19-Oct-12 16:21 
GeneralRe: Bookmarked ! PinmemberakramKamal20-Oct-12 3:51 
GeneralMy vote of 5 PinmemberGun Gun Febrianza16-Oct-12 17:42 
GeneralMy vote of 5 Pinmemberjjlangatjose16-Oct-12 8:07 
QuestionThanks PinmemberShabanaParveen15-Oct-12 19:43 
Questionimplementing downloader PinmemberFatih Akgun12-Oct-12 20:25 
AnswerRe: implementing downloader PinmemberakramKamal14-Oct-12 7:06 
GeneralRe: implementing downloader PinmemberFatih Akgun15-Oct-12 2:17 
GeneralMy vote of 5 PinmemberYaroslav Tatarenko26-Sep-12 21:07 
GeneralMy vote of 5 PinmemberVinicius G. A. de Oliveira24-Sep-12 9:11 
GeneralRe: My vote of 5 PinmemberakramKamal24-Sep-12 9:25 
GeneralRe: My vote of 5 PinmemberVinicius G. A. de Oliveira24-Sep-12 9:43 
GeneralRe: My vote of 5 PinmemberakramKamal14-Oct-12 7:10 
Question5 out of 5 [modified] PinmemberMember 826886824-Sep-12 8:42 
AnswerRe: Broken download link PinmemberakramKamal27-Sep-12 0:09 
QuestionIt's working now! PinmvpOriginalGriff24-Sep-12 5:25 
AnswerRe: It's working now! PinmemberakramKamal24-Sep-12 5:28 
GeneralMy vote of 5 PinmemberHoussem Dellai23-Sep-12 8:45 
QuestionNot working Pinmemberporcelli16-Sep-12 20:09 
AnswerRe: Not working PinmemberakramKamal17-Sep-12 10:50 
AnswerRe: Not working PinmemberakramKamal24-Sep-12 5:39 
QuestionHow you decode the Video Info. PinmemberHenry Rosales Parra10-Sep-12 11:18 
AnswerRe: How you decode the Video Info. PinmemberakramKamal10-Sep-12 12:06 

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