YoutubeExtractor

Overview

YoutubeExtractor is a library for .NET, written in C#, that allows to download videos from YouTube and/or extract their audio track (audio extraction currently only for flash videos).

Target platforms

.NET Framework 3.5 and higher
Windows Phone 8
WinRT
Xamarin.Android
Xamarin.iOS

Note that Windows Phone 8, WinRT, Xamarin.Android and Xamarin.iOS only support the extraction of the download URLs

NuGet

YoutubeExtractor at NuGet

Install-Package YoutubeExtractor

License

YoutubeExtractor has two licenses;

The YouTube URL-extraction code is licensed under the MIT License

The audio extraction code that is originally from FlvExtract is licenced under the GNU General Public License version 2 (GPLv2)

Files that are GPLv2 licensed are explicitly marked with the GPLv2 header at the top of the file. All other files are implicitly MIT licensed.

Credits

FlvExtract for extracting MP3 and AAC audio tracks out of flash files.

Example code

Get the download URLs

// Our test youtube link
string link = "insert youtube link";

/*
 * Get the available video formats.
 * We'll work with them in the video and audio download examples.
 */
IEnumerable<VideoInfo> videoInfos = DownloadUrlResolver.GetDownloadUrls(link);

Download the video

/*
 * Select the first .mp4 video with 360p resolution
 */
VideoInfo video = videoInfos
    .First(info => info.VideoType == VideoType.Mp4 && info.Resolution == 360);
    
/*
 * If the video has a decrypted signature, decipher it
 */
if (video.RequiresDecryption)
{
    DownloadUrlResolver.DecryptDownloadUrl(video);
}

/*
 * Create the video downloader.
 * The first argument is the video to download.
 * The second argument is the path to save the video file.
 */
var videoDownloader = new VideoDownloader(video, Path.Combine("D:/Downloads", video.Title + video.VideoExtension));

// Register the ProgressChanged event and print the current progress
videoDownloader.DownloadProgressChanged += (sender, args) => Console.WriteLine(args.ProgressPercentage);

/*
 * Execute the video downloader.
 * For GUI applications note, that this method runs synchronously.
 */
videoDownloader.Execute();

Download the audio track

/*
 * We want the first extractable video with the highest audio quality.
 */
VideoInfo video = videoInfos
    .Where(info => info.CanExtractAudio)
    .OrderByDescending(info => info.AudioBitrate)
    .First();
    
/*
 * If the video has a decrypted signature, decipher it
 */
if (video.RequiresDecryption)
{
    DownloadUrlResolver.DecryptDownloadUrl(video);
}

/*
 * Create the audio downloader.
 * The first argument is the video where the audio should be extracted from.
 * The second argument is the path to save the audio file.
 */
var audioDownloader = new AudioDownloader(video, Path.Combine("D:/Downloads", video.Title + video.AudioExtension));

// Register the progress events. We treat the download progress as 85% of the progress and the extraction progress only as 15% of the progress,
// because the download will take much longer than the audio extraction.
audioDownloader.DownloadProgressChanged += (sender, args) => Console.WriteLine(args.ProgressPercentage * 0.85);
audioDownloader.AudioExtractionProgressChanged += (sender, args) => Console.WriteLine(85 + args.ProgressPercentage * 0.15);

/*
 * Execute the audio downloader.
 * For GUI applications note, that this method runs synchronously.
 */
audioDownloader.Execute();