Support downloading VODs as audio only

TwitchDownloaderCLI/Modes/Arguments/VideoDownloadArgs.cs

@@ -8,7 +8,7 @@ public class VideoDownloadArgs : ITwitchDownloaderArgs
         [Option('u', "id", Required = true, HelpText = "The ID or URL of the VOD to download.")]
         public string Id { get; set; }
 
-        [Option('o', "output", Required = true, HelpText = "Path to output file.")]
+        [Option('o', "output", Required = true, HelpText = "Path to output file. File extension will be used to determine download type. Valid extensions are: .mp4 and .m4a.")]
         public string OutputFile { get; set; }
 
         [Option('q', "quality", HelpText = "The quality the program will attempt to download.")]

TwitchDownloaderCLI/Modes/DownloadVideo.cs

@@ -38,14 +38,27 @@ private static VideoDownloadOptions GetDownloadOptions(VideoDownloadArgs inputOp
                 Environment.Exit(1);
             }
 
+            if (!Path.HasExtension(inputOptions.OutputFile) && inputOptions.Quality is { Length: > 0 })
+            {
+                if (char.IsDigit(inputOptions.Quality[0]))
+                    inputOptions.OutputFile += ".mp4";
+                else if (char.ToLower(inputOptions.Quality[0]) is 'a')
+                    inputOptions.OutputFile += ".m4a";
+            }
+
             VideoDownloadOptions downloadOptions = new()
             {
                 DownloadThreads = inputOptions.DownloadThreads,
                 ThrottleKib = inputOptions.ThrottleKib,
                 Id = int.Parse(vodIdMatch.ValueSpan),
                 Oauth = inputOptions.Oauth,
                 Filename = inputOptions.OutputFile,
-                Quality = inputOptions.Quality,
+                Quality = Path.GetExtension(inputOptions.OutputFile)!.ToLower() switch
+                {
+                    ".mp4" => inputOptions.Quality,
+                    ".m4a" => "Audio",
+                    _ => throw new ArgumentException("Only MP4 and M4A audio files are supported.")
+                },
                 CropBeginning = inputOptions.CropBeginningTime > 0.0,
                 CropBeginningTime = inputOptions.CropBeginningTime,
                 CropEnding = inputOptions.CropEndingTime > 0.0,

TwitchDownloaderCLI/README.md

@@ -21,7 +21,7 @@ A cross platform command line tool that can do the main functions of the GUI pro
 The ID or URL of the VOD to download.
 
 **-o / --output (REQUIRED)**
-File the program will output to.
+File the program will output to. File extension will be used to determine download type. Valid extensions are: `.mp4` and `.m4a`.
 
 **-q / --quality**
 The quality the program will attempt to download, for example "1080p60", if not found will download highest quality stream.

TwitchDownloaderCore/TwitchHelper.cs

@@ -58,7 +58,7 @@ public static async Task<string[]> GetVideoPlaylist(int videoId, string token, s
         {
             var request = new HttpRequestMessage()
             {
-                RequestUri = new Uri($"http://usher.ttvnw.net/vod/{videoId}?nauth={token}&nauthsig={sig}&allow_source=true&player=twitchweb"),
+                RequestUri = new Uri($"http://usher.ttvnw.net/vod/{videoId}?nauth={token}&nauthsig={sig}&allow_audio_only=true&allow_source=true&player=twitchweb"),
                 Method = HttpMethod.Get
             };
             request.Headers.Add("Client-ID", "kimne78kx3ncx6brgo4mv6wki5h1ko");

TwitchDownloaderCore/VideoDownloader.cs

@@ -585,9 +585,9 @@ private static async Task DownloadVideoPartAsync(HttpClient httpClient, Uri base
                 }
             }
 
-            if (downloadOptions.Quality != null && videoQualities.Any(x => x.Key.StartsWith(downloadOptions.Quality)))
+            if (downloadOptions.Quality != null && videoQualities.Any(x => x.Key.StartsWith(downloadOptions.Quality, StringComparison.OrdinalIgnoreCase)))
             {
-                return videoQualities.Last(x => x.Key.StartsWith(downloadOptions.Quality)).Value;
+                return videoQualities.Last(x => x.Key.StartsWith(downloadOptions.Quality, StringComparison.OrdinalIgnoreCase)).Value;
             }
 
             // Unable to find specified quality, defaulting to highest quality

TwitchDownloaderWPF/PageVodDownload.xaml.cs

@@ -207,7 +207,7 @@ public VideoDownloadOptions GetOptions(string filename, string folder)
                 Filename = filename ?? Path.Combine(folder, FilenameService.GetFilename(Settings.Default.TemplateVod, textTitle.Text, currentVideoId.ToString(), currentVideoTime, textStreamer.Text,
                     checkStart.IsChecked == true ? new TimeSpan((int)numStartHour.Value, (int)numStartMinute.Value, (int)numStartSecond.Value) : TimeSpan.Zero,
                     checkEnd.IsChecked == true ? new TimeSpan((int)numEndHour.Value, (int)numEndMinute.Value, (int)numEndSecond.Value) : vodLength,
-                    viewCount.ToString(), game) + ".mp4"),
+                    viewCount.ToString(), game) + (comboQuality.Text.Contains("Audio", StringComparison.OrdinalIgnoreCase) ? ".m4a" : ".mp4")),
                 Oauth = TextOauth.Text,
                 Quality = GetQualityWithoutSize(comboQuality.Text).ToString(),
                 Id = currentVideoId,
@@ -402,7 +402,7 @@ private async void SplitBtnDownloader_Click(object sender, RoutedEventArgs e)
 
             SaveFileDialog saveFileDialog = new SaveFileDialog
             {
-                Filter = "MP4 Files | *.mp4",
+                Filter = comboQuality.Text.Contains("Audio", StringComparison.OrdinalIgnoreCase) ? "M4A Files | *.m4a" : "MP4 Files | *.mp4",
                 FileName = FilenameService.GetFilename(Settings.Default.TemplateVod, textTitle.Text, currentVideoId.ToString(), currentVideoTime, textStreamer.Text,
                     checkStart.IsChecked == true ? new TimeSpan((int)numStartHour.Value, (int)numStartMinute.Value, (int)numStartSecond.Value) : TimeSpan.Zero,
                     checkEnd.IsChecked == true ? new TimeSpan((int)numEndHour.Value, (int)numEndMinute.Value, (int)numEndSecond.Value) : vodLength,