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Example C# code to extract audio from YouTube and save as trimmed 15-second WAV file. Requires ffmpeg.exe
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| <?xml version="1.0" encoding="utf-8" ?> | |
| <configuration> | |
| <appSettings> | |
| <add key="ffmpeg:ExeLocation" value="../../../tools/ffmpeg.exe" /> | |
| </appSettings> | |
| </configuration> |
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| using YoutubeExtractor; | |
| using Frapper; | |
| private static void Main() | |
| { | |
| IEnumerable<VideoInfo> videoInfos = DownloadUrlResolver.GetDownloadUrls("https://www.youtube.com/watch?v=GRubo5wg6_Y", false); | |
| string path = DownloadAudioQuick(videoInfos); | |
| path = Mp4ToWav(path, 15); | |
| } | |
| private static string RemoveIllegalPathCharacters(string path) | |
| { | |
| string regexSearch = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars()); | |
| var r = new Regex(string.Format("[{0}]", Regex.Escape(regexSearch))); | |
| return r.Replace(path, ""); | |
| } | |
| private static string DownloadAudioQuick(IEnumerable<VideoInfo> videoInfos) | |
| { | |
| VideoInfo video = videoInfos.First(info => info.VideoType == VideoType.Mp4 && info.Resolution == 0); | |
| string path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), RemoveIllegalPathCharacters(video.Title) + ".mp4"); | |
| var audioDownloader = new VideoDownloader(video, path); | |
| audioDownloader.Execute(); | |
| return path; | |
| } | |
| private static string Mp4ToWav(string path, int seconds = 10) | |
| { | |
| string result; | |
| return Mp4ToWav(path, seconds, out result); | |
| } | |
| private static string Mp4ToWav(string path, int seconds, out string result) | |
| { | |
| FFMPEG ffmpeg = new FFMPEG(); | |
| // Trim mp4. | |
| string outputPath = Path.GetDirectoryName(path) + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(path) + "_trim.mp4"; | |
| string result1 = ffmpeg.RunCommand("-ss 00:00:00.0 -t 00:00:" + seconds.ToString().PadLeft(2, '0') + ".0 -i \"" + path + "\" -c copy \"" + outputPath + "\""); | |
| // Convert to wav. | |
| string wavPath = outputPath.Replace(".mp4", ".wav"); | |
| string result2 = ffmpeg.RunCommand("-i \"" + outputPath + "\" -acodec pcm_u8 -ar 22050 \"" + wavPath + "\""); | |
| result = result1 + "\n\n\n" + result2; | |
| // Cleanup. | |
| File.Delete(path); | |
| File.Delete(outputPath); | |
| return wavPath; | |
| } |
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