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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:
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2- VB6 Language.
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i have more than 7 experience years in coding and programming.
 
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18-AdminYourTube (C#)
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Comments and Discussions

 
QuestionIt's working PinmemberTailBoy1-Mar-15 7:08 
AnswerRe: It's working PinmemberDev Enthusiast1-Mar-15 16:16 
QuestionProxy Support in existing code PinmemberMember 1108914326-Feb-15 19:03 
AnswerRe: Proxy Support in existing code PinmemberDev Enthusiast27-Feb-15 5:13 
GeneralRe: Proxy Support in existing code PinmemberMember 1108914328-Feb-15 5:37 
Question403 - Forbiden PinmemberEduardoMello23-Feb-15 9:32 
AnswerRe: 403 - Forbiden PinmemberDev Enthusiast23-Feb-15 16:50 
GeneralRe: 403 - Forbiden PinmemberEduardoMello24-Feb-15 2:25 
AnswerRe: 403 - Forbiden PinmemberDev Enthusiast24-Feb-15 7:14 
GeneralRe: 403 - Forbiden PinmemberEduardoMello24-Feb-15 13:45 
AnswerRe: 403 - Forbiden PinmemberDev Enthusiast26-Feb-15 3:42 
GeneralRe: 403 - Forbiden PinmemberMember 114158241-Mar-15 11:36 
GeneralRe: 403 - Forbiden PinmemberJohann Krenn24-Feb-15 9:07 
GeneralRe: 403 - Forbiden PinmemberEduardoMello24-Feb-15 13:43 
AnswerSolution: Handling YouTube mobile links PinmemberDev Enthusiast22-Feb-15 12:35 
GeneralRe: Solution: Handling YouTube mobile links Pinmembertkdmaster22-Feb-15 14:00 
AnswerRe: Solution: Handling YouTube mobile links PinmemberDev Enthusiast24-Feb-15 9:14 
Generaldownload on php PinmemberMember 1146473119-Feb-15 7:28 
AnswerHelper.cs InitialProxy() PinmemberDev Enthusiast16-Feb-15 17:10 
QuestionHow to get a working version with YoutubeExtractor Pinmemberahmet_uzun11-Feb-15 0:05 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberkhaisiaw11-Feb-15 1:20 
AnswerRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast11-Feb-15 5:01 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun11-Feb-15 5:32 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberJohann Krenn11-Feb-15 6:05 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun11-Feb-15 6:14 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberJohann Krenn11-Feb-15 7:24 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun11-Feb-15 23:06 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberJohann Krenn12-Feb-15 8:49 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun12-Feb-15 22:59 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberJohann Krenn12-Feb-15 23:30 
AnswerRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast13-Feb-15 3:30 
SuggestionRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast16-Feb-15 19:15 
GeneralRe: How to get a working version with YoutubeExtractor [modified] PinmemberJohann Krenn16-Feb-15 21:00 
BugRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast19-Feb-15 23:03 
GeneralRe: How to get a working version with YoutubeExtractor [modified] PinmemberJohann Krenn20-Feb-15 7:12 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast20-Feb-15 9:56 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast20-Feb-15 10:35 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberJohann Krenn20-Feb-15 10:48 
AnswerRe: How to get a working version with YoutubeExtractor [modified] PinmemberDev Enthusiast20-Feb-15 14:53 
NewsRe: How to get a working version with YoutubeExtractor PinmemberDev Enthusiast27-Feb-15 5:21 
AnswerRe: How to get a working version with YoutubeExtractor [modified] PinmemberKoh Twee Toong17-Feb-15 18:54 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun18-Feb-15 19:00 
GeneralRe: How to get a working version with YoutubeExtractor PinmemberKoh Twee Toong19-Feb-15 6:29 
GeneralRe: How to get a working version with YoutubeExtractor Pinmemberahmet_uzun20-Feb-15 1:39 
SuggestionVersion with YoutubeExtractor Pinmemberahmet_uzun10-Feb-15 5:06 
GeneralRe: Version with YoutubeExtractor PinmemberDev Enthusiast10-Feb-15 7:08 
GeneralRe: Version with YoutubeExtractor Pinmemberkhaisiaw10-Feb-15 7:08 
SuggestionRe: Version with YoutubeExtractor PinmemberDev Enthusiast10-Feb-15 7:56 
GeneralRe: Version with YoutubeExtractor PinmemberDev Enthusiast10-Feb-15 7:11 
GeneralRe: Version with YoutubeExtractor Pinmemberahmet_uzun10-Feb-15 22:54 

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