Added playlist support

Download.Designer.cs

@@ -28,24 +28,26 @@
         /// </summary>
         private void InitializeComponent()
         {
-            this.lblStatus = new System.Windows.Forms.Label();
+            this.lblDownload = new System.Windows.Forms.Label();
             this.btnCancel = new System.Windows.Forms.Button();
-            this.progressBar = new System.Windows.Forms.ProgressBar();
+            this.pbDownload = new System.Windows.Forms.ProgressBar();
+            this.pbConvertion = new System.Windows.Forms.ProgressBar();
+            this.lblConvertion = new System.Windows.Forms.Label();
             this.SuspendLayout();
             // 
-            // lblStatus
+            // lblDownload
             // 
-            this.lblStatus.AutoSize = true;
+            this.lblDownload.AutoSize = true;
-            this.lblStatus.Location = new System.Drawing.Point(13, 13);
+            this.lblDownload.Location = new System.Drawing.Point(13, 13);
-            this.lblStatus.Name = "lblStatus";
+            this.lblDownload.Name = "lblDownload";
-            this.lblStatus.Size = new System.Drawing.Size(139, 25);
+            this.lblDownload.Size = new System.Drawing.Size(139, 25);
-            this.lblStatus.TabIndex = 0;
+            this.lblDownload.TabIndex = 0;
-            this.lblStatus.Text = "Connecting...";
+            this.lblDownload.Text = "Connecting...";
             // 
             // btnCancel
             // 
             this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Abort;
-            this.btnCancel.Location = new System.Drawing.Point(625, 41);
+            this.btnCancel.Location = new System.Drawing.Point(899, 127);
             this.btnCancel.Name = "btnCancel";
             this.btnCancel.Size = new System.Drawing.Size(110, 40);
             this.btnCancel.TabIndex = 7;
@@ -53,21 +55,38 @@
             this.btnCancel.UseVisualStyleBackColor = true;
             this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
             // 
-            // progressBar
+            // pbDownload
             // 
-            this.progressBar.Location = new System.Drawing.Point(18, 41);
+            this.pbDownload.Location = new System.Drawing.Point(18, 41);
-            this.progressBar.Name = "progressBar";
+            this.pbDownload.Name = "pbDownload";
-            this.progressBar.Size = new System.Drawing.Size(601, 40);
+            this.pbDownload.Size = new System.Drawing.Size(875, 40);
-            this.progressBar.TabIndex = 8;
+            this.pbDownload.TabIndex = 8;
+            // 
+            // pbConvertion
+            // 
+            this.pbConvertion.Location = new System.Drawing.Point(18, 127);
+            this.pbConvertion.Name = "pbConvertion";
+            this.pbConvertion.Size = new System.Drawing.Size(875, 40);
+            this.pbConvertion.TabIndex = 10;
+            // 
+            // lblConvertion
+            // 
+            this.lblConvertion.AutoSize = true;
+            this.lblConvertion.Location = new System.Drawing.Point(13, 99);
+            this.lblConvertion.Name = "lblConvertion";
+            this.lblConvertion.Size = new System.Drawing.Size(0, 25);
+            this.lblConvertion.TabIndex = 9;
             // 
             // Download
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(12F, 25F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(747, 102);
+            this.ClientSize = new System.Drawing.Size(1021, 183);
-            this.Controls.Add(this.progressBar);
+            this.Controls.Add(this.pbConvertion);
+            this.Controls.Add(this.lblConvertion);
+            this.Controls.Add(this.pbDownload);
             this.Controls.Add(this.btnCancel);
-            this.Controls.Add(this.lblStatus);
+            this.Controls.Add(this.lblDownload);
             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
             this.Name = "Download";
             this.Text = "Downloading";
@@ -80,8 +99,10 @@
 
         #endregion
 
-        private System.Windows.Forms.Label lblStatus;
+        private System.Windows.Forms.Label lblDownload;
         private System.Windows.Forms.Button btnCancel;
-        private System.Windows.Forms.ProgressBar progressBar;
+        private System.Windows.Forms.ProgressBar pbDownload;
+        private System.Windows.Forms.ProgressBar pbConvertion;
+        private System.Windows.Forms.Label lblConvertion;
     }
 }

Download.cs

@@ -5,6 +5,7 @@ using System.Data;
 using System.Drawing;
 using System.IO;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Runtime.Remoting.Contexts;
 using System.Security.AccessControl;
 using System.Security.Policy;
@@ -25,22 +26,34 @@ namespace ytdlp_gui
             InitializeComponent();
         }
 
-        private void Download_Load(object sender, EventArgs e)
+        private async void Download_Load(object sender, EventArgs e)
         {
             process.Start += (_sender, start_event) =>
             {
-                lblStatus.Text = String.Format(
+                lblDownload.Text = String.Format(
                     "Connecting to %s...",
                     start_event.provider
                 );
             };
 
+            process.Error += (_sender, error_event) =>
+            {
+                MessageBox.Show(this, error_event.error, "yt-dlp error", MessageBoxButtons.OK, MessageBoxIcon.Error );
+                this.Close();
+            };
+
             process.Progress += (_sender, prog_event) =>
             {
                 int progress = (int)(prog_event.progress * 100 + 0.5);
-                this.Text = "Downloading - " + progress.ToString() + "%";
+                this.Text = String.Format(
-                lblStatus.Text = prog_event.file;
+                    "Downloading {0}/{1} {2}% - {3}",
-                progressBar.Value = progress;
+                    prog_event.playlist_current,
+                    prog_event.playlist_total,
+                    progress,
+                    prog_event.file
+                );
+                lblDownload.Text = this.Text;
+                pbDownload.Value = progress;
             };
 
             process.Finished += (_sender, finish_event) =>
@@ -66,33 +79,41 @@ namespace ytdlp_gui
                 {
                     System.IO.File.Move(filePath, newFilePath);
                     System.IO.File.SetLastWriteTime(newFilePath, DateTime.Now);
-                    this.Close();
                 }
                 else
                 {
+                    newFile = Path.ChangeExtension(newFile, convert_to);
                     newFilePath = Path.ChangeExtension(newFilePath, convert_to);
-                    convertion = (new FFmpeg()).Convert(filePath, newFilePath);
+                    FFmpegProcess convertion = (new FFmpeg()).Convert(filePath, newFilePath);
 
-                    convertion.Progress += (_ffmpeg, progress_event) =>
+                    convertion.Progress += (_ffmpeg, prog_event) =>
                     {
-                        int progress = (int)(progress_event.progress * 100 + 0.5);
+                        int progress = (int)(prog_event.progress * 100 + 0.5);
-                        this.Text = "Converting - " + progress.ToString() + "%";
+                        // this.Text = "Converting - " + progress.ToString() + "%";
-                        lblStatus.Text = "Converting to " + convert_to;
+                        lblConvertion.Text = String.Format(
-                        progressBar.Value = progress;
+                            "Converting {0}/{1} {2}% - {3}",
+                            convertion_current,
+                            convertion_total,
+                            progress,
+                            newFile
+                        );
+                        pbConvertion.Value = progress;
                     };
 
                     convertion.Finished += (_ffmpeg, _ffmpeg_e) =>
                     {
                         System.IO.File.Delete(filePath);
-                        this.Close();
+                        triggerConvertionQueue();
                     };
 
-                    convertion.Run().ContinueWith(t => { MessageBox.Show(t.Exception.ToString(), "Error"); }, TaskContinuationOptions.OnlyOnFaulted); ;
+                    convertion_queue.Enqueue(convertion);
+                    convertion_total += 1;
+                    triggerConvertionQueue();
                 }
             };
 
             // Can run in background :)
-            process.Run().ContinueWith(t => { MessageBox.Show(t.Exception.ToString(), "Error"); }, TaskContinuationOptions.OnlyOnFaulted);
+            _ = await process.Run();
         }
 
         private void btnCancel_Click(object sender, EventArgs e)
@@ -102,12 +123,30 @@ namespace ytdlp_gui
 
         private void Download_FormClosing(object sender, FormClosingEventArgs e)
         {
-            if (convertion != null)
+            process.Cancel();
-                convertion.Cancel();
+            foreach (FFmpegProcess conversion in convertion_queue)
+                conversion.Cancel();
+        }
+
+        protected async void triggerConvertionQueue()
+        {
+            if (converting)
+                return;
+
+            if (convertion_queue.Count() == 0)
+                return;
+
+            converting = true;
+            convertion_current += 1;
+            await convertion_queue.Dequeue().Run();
+            converting = false;
         }
 
         protected readonly YTdlpProcess process;
-        protected FFmpegProcess convertion;
+        protected int convertion_current = 0;
+        protected int convertion_total = 0;
+        protected Queue<FFmpegProcess> convertion_queue = new Queue<FFmpegProcess>();
+        private bool converting = false;
         protected readonly string workdir;
         protected readonly string convert_to;
     }

FFmpeg.cs

@@ -29,9 +29,6 @@ namespace ytdlp_gui
             this.output_file = output_file;
             ci = (CultureInfo)CultureInfo.CurrentCulture.Clone();
             ci.NumberFormat.CurrencyDecimalSeparator = ".";
-
-            this.header_regex = new Regex(@"Duration: (\d+):(\d+):(\d+)\.(\d+)");
-            this.progress_regex = new Regex(@"time=(\d+):(\d+):(\d+)\.(\d+)");
         }
 
         ~FFmpegProcess()
@@ -39,7 +36,7 @@ namespace ytdlp_gui
             Cancel();
         }
 
-        public async Task<string> Run()
+        public async Task Run()
         {
             if (File.Exists(output_file))
                 System.IO.File.Delete(output_file);
@@ -71,37 +68,33 @@ namespace ytdlp_gui
                         + int.Parse(groups[2].Value) * 60
                         + int.Parse(groups[3].Value);
 
-                    Progress?.Invoke(this, new FFmpegProgressEventArgs((float)progress / duration));
+                    Progress?.Invoke(this, new FFmpegProgressEventArgs(Math.Min((float)progress / duration, 1)));
                 }
             }
 
+            if (stop)
+                return;
+
             process.WaitForExit();
-            process.Close();
             Finished?.Invoke(this, new EventArgs());
 
-            return null;
+            return;
         }
 
         public void Cancel()
         {
-            bool finished = true;
+            stop = true;
-            try // to kill the process before deleting the file
+            if (!process.HasExited)
-            {
-                finished = process.HasExited;
                 process.Kill();
             process.WaitForExit();
-                process.Close();
-            }
-            catch { }
-            // if (!finished && File.Exists(output_file))
-            //     System.IO.File.Delete(output_file);
         }
 
         private readonly Process process;
         private readonly string output_file;
         private readonly CultureInfo ci;
-        private readonly Regex header_regex;
+        private readonly Regex header_regex = new Regex(@"Duration: (\d+):(\d+):(\d+)\.(\d+)");
-        private readonly Regex progress_regex;
+        private readonly Regex progress_regex = new Regex(@"time=(\d+):(\d+):(\d+)\.(\d+)");
+        private bool stop = false;
         public event EventHandler<FFmpegProgressEventArgs> Progress;
         public event EventHandler Finished;
     }
@@ -124,7 +117,7 @@ namespace ytdlp_gui
 
             process.StartInfo.UseShellExecute = false;
             process.StartInfo.CreateNoWindow = true;
-            process.StartInfo.RedirectStandardOutput = true;
+            // process.StartInfo.RedirectStandardOutput = true;
             process.StartInfo.RedirectStandardError = true;
 
             return new FFmpegProcess(process, to);

Main.Designer.cs

@@ -31,9 +31,9 @@
             this.label1 = new System.Windows.Forms.Label();
             this.textUrl = new System.Windows.Forms.TextBox();
             this.checkDownloadPlaylist = new System.Windows.Forms.CheckBox();
-            this.groupBox1 = new System.Windows.Forms.GroupBox();
+            this.groupPlaylist = new System.Windows.Forms.GroupBox();
             this.textPlaylistFolder = new System.Windows.Forms.TextBox();
-            this.label2 = new System.Windows.Forms.Label();
+            this.lblPlaylistFolder = new System.Windows.Forms.Label();
             this.checkPlaylistFolder = new System.Windows.Forms.CheckBox();
             this.groupBox2 = new System.Windows.Forms.GroupBox();
             this.label3 = new System.Windows.Forms.Label();
@@ -42,7 +42,7 @@
             this.btnDownload = new System.Windows.Forms.Button();
             this.btnCancel = new System.Windows.Forms.Button();
             this.checkAudioOnly = new System.Windows.Forms.CheckBox();
-            this.groupBox1.SuspendLayout();
+            this.groupPlaylist.SuspendLayout();
             this.groupBox2.SuspendLayout();
             this.SuspendLayout();
             // 
@@ -65,42 +65,44 @@
             // checkDownloadPlaylist
             // 
             this.checkDownloadPlaylist.AutoSize = true;
-            this.checkDownloadPlaylist.Enabled = false;
             this.checkDownloadPlaylist.Location = new System.Drawing.Point(25, 178);
             this.checkDownloadPlaylist.Name = "checkDownloadPlaylist";
             this.checkDownloadPlaylist.Size = new System.Drawing.Size(212, 29);
             this.checkDownloadPlaylist.TabIndex = 2;
             this.checkDownloadPlaylist.Text = "Download playlist";
             this.checkDownloadPlaylist.UseVisualStyleBackColor = true;
+            this.checkDownloadPlaylist.CheckedChanged += new System.EventHandler(this.checkDownloadPlaylist_CheckedChanged);
             // 
-            // groupBox1
+            // groupPlaylist
             // 
-            this.groupBox1.Controls.Add(this.textPlaylistFolder);
+            this.groupPlaylist.Controls.Add(this.textPlaylistFolder);
-            this.groupBox1.Controls.Add(this.label2);
+            this.groupPlaylist.Controls.Add(this.lblPlaylistFolder);
-            this.groupBox1.Controls.Add(this.checkPlaylistFolder);
+            this.groupPlaylist.Controls.Add(this.checkPlaylistFolder);
-            this.groupBox1.Enabled = false;
+            this.groupPlaylist.Enabled = false;
-            this.groupBox1.Location = new System.Drawing.Point(18, 58);
+            this.groupPlaylist.Location = new System.Drawing.Point(18, 58);
-            this.groupBox1.Name = "groupBox1";
+            this.groupPlaylist.Name = "groupPlaylist";
-            this.groupBox1.Size = new System.Drawing.Size(373, 108);
+            this.groupPlaylist.Size = new System.Drawing.Size(373, 108);
-            this.groupBox1.TabIndex = 3;
+            this.groupPlaylist.TabIndex = 3;
-            this.groupBox1.TabStop = false;
+            this.groupPlaylist.TabStop = false;
-            this.groupBox1.Text = "Playlist";
+            this.groupPlaylist.Text = "Playlist";
             // 
             // textPlaylistFolder
             // 
+            this.textPlaylistFolder.Enabled = false;
             this.textPlaylistFolder.Location = new System.Drawing.Point(94, 60);
             this.textPlaylistFolder.Name = "textPlaylistFolder";
             this.textPlaylistFolder.Size = new System.Drawing.Size(273, 31);
             this.textPlaylistFolder.TabIndex = 2;
             // 
-            // label2
+            // lblPlaylistFolder
             // 
-            this.label2.AutoSize = true;
+            this.lblPlaylistFolder.AutoSize = true;
-            this.label2.Location = new System.Drawing.Point(7, 67);
+            this.lblPlaylistFolder.Enabled = false;
-            this.label2.Name = "label2";
+            this.lblPlaylistFolder.Location = new System.Drawing.Point(7, 67);
-            this.label2.Size = new System.Drawing.Size(80, 25);
+            this.lblPlaylistFolder.Name = "lblPlaylistFolder";
-            this.label2.TabIndex = 1;
+            this.lblPlaylistFolder.Size = new System.Drawing.Size(80, 25);
-            this.label2.Text = "Name: ";
+            this.lblPlaylistFolder.TabIndex = 1;
+            this.lblPlaylistFolder.Text = "Name: ";
             // 
             // checkPlaylistFolder
             // 
@@ -111,6 +113,7 @@
             this.checkPlaylistFolder.TabIndex = 0;
             this.checkPlaylistFolder.Text = "Save to folder";
             this.checkPlaylistFolder.UseVisualStyleBackColor = true;
+            this.checkPlaylistFolder.CheckedChanged += new System.EventHandler(this.checkPlaylistFolder_CheckedChanged);
             // 
             // groupBox2
             // 
@@ -201,7 +204,7 @@
             this.Controls.Add(this.btnCancel);
             this.Controls.Add(this.btnDownload);
             this.Controls.Add(this.groupBox2);
-            this.Controls.Add(this.groupBox1);
+            this.Controls.Add(this.groupPlaylist);
             this.Controls.Add(this.checkDownloadPlaylist);
             this.Controls.Add(this.textUrl);
             this.Controls.Add(this.label1);
@@ -211,8 +214,8 @@
             this.Name = "Main";
             this.Text = "Youtube Downloader";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Main_FormClosing);
-            this.groupBox1.ResumeLayout(false);
+            this.groupPlaylist.ResumeLayout(false);
-            this.groupBox1.PerformLayout();
+            this.groupPlaylist.PerformLayout();
             this.groupBox2.ResumeLayout(false);
             this.groupBox2.PerformLayout();
             this.ResumeLayout(false);
@@ -225,10 +228,10 @@
         private System.Windows.Forms.Label label1;
         private System.Windows.Forms.TextBox textUrl;
         private System.Windows.Forms.CheckBox checkDownloadPlaylist;
-        private System.Windows.Forms.GroupBox groupBox1;
+        private System.Windows.Forms.GroupBox groupPlaylist;
         private System.Windows.Forms.CheckBox checkPlaylistFolder;
         private System.Windows.Forms.TextBox textPlaylistFolder;
-        private System.Windows.Forms.Label label2;
+        private System.Windows.Forms.Label lblPlaylistFolder;
         private System.Windows.Forms.GroupBox groupBox2;
         private System.Windows.Forms.ComboBox comboConvertFormat;
         private System.Windows.Forms.CheckBox checkConvert;

Main.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -30,10 +31,17 @@ namespace ytdlp_gui
             string user = Environment.GetEnvironmentVariable("USERNAME");
             string workdir = @"C:\Users\" + user + @"\Downloads\";
 
+            if (checkDownloadPlaylist.Checked && checkPlaylistFolder.Checked)
+            {
+                workdir = Path.Combine(workdir, textPlaylistFolder.Text);
+                if (!Directory.Exists(workdir))
+                    System.IO.Directory.CreateDirectory(workdir);
+            }
+
             YTdlpProcess process = ytdlp.Download(
                 textUrl.Text,
                 checkAudioOnly.Checked,
-                false,
+                checkDownloadPlaylist.Checked,
                 workdir
             );
             Download download = new Download(
@@ -75,6 +83,17 @@ namespace ytdlp_gui
             comboConvertFormat.Enabled = checkConvert.Checked;
         }
 
+        private void checkDownloadPlaylist_CheckedChanged(object sender, EventArgs e)
+        {
+            groupPlaylist.Enabled = checkDownloadPlaylist.Checked;
+        }
+
+        private void checkPlaylistFolder_CheckedChanged(object sender, EventArgs e)
+        {
+            textPlaylistFolder.Enabled = checkPlaylistFolder.Checked;
+            lblPlaylistFolder.Enabled = checkPlaylistFolder.Checked;
+        }
+
         protected List<Download> downloads;
         protected YTdlp ytdlp;
     }

ProcessUtil.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Management;
+
+namespace ytdlp_gui
+{
+    internal static class ProcessUtil
+    {
+        /// https://stackoverflow.com/questions/5901679/kill-process-tree-programmatically-in-c-sharp#answer-10402906
+        /// <summary>
+        /// Kill a process, and all of its children, grandchildren, etc.
+        /// </summary>
+        /// <param name="pid">Process ID.</param>
+        public static void KillProcessAndChildren(int pid)
+        {
+            // Cannot close 'system idle process'.
+            if (pid == 0)
+            {
+                return;
+            }
+            ManagementObjectSearcher searcher = new ManagementObjectSearcher
+                    ("Select * From Win32_Process Where ParentProcessID=" + pid);
+            ManagementObjectCollection moc = searcher.Get();
+            foreach (ManagementObject mo in moc)
+            {
+                KillProcessAndChildren(Convert.ToInt32(mo["ProcessID"]));
+            }
+            try
+            {
+                Process proc = Process.GetProcessById(pid);
+                proc.Kill();
+            }
+            catch (ArgumentException)
+            {
+                // Process already exited.
+            }
+        }
+    }
+}

YTdlp.cs

@@ -3,9 +3,12 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Deployment.Application;
 using System.Diagnostics;
+using System.Drawing.Printing;
 using System.Globalization;
 using System.IO;
 using System.Linq;
+using System.Linq.Expressions;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
@@ -24,18 +27,31 @@ namespace ytdlp_gui
 
     public class YTdlpProgressEventArgs : EventArgs
     {
-        public YTdlpProgressEventArgs(string provider, string action, string file, float progress)
+        public YTdlpProgressEventArgs(
-        {
+            string provider,
+            string action,
+            string file,
+            float progress,
+            string playlist,
+            int playlist_current,
+            int playlist_total
+        ){
             this.provider = provider;
             this.action = action;
             this.file = file;
             this.progress = progress;
+            this.playlist = playlist;
+            this.playlist_current = playlist_current;
+            this.playlist_total = playlist_total;
         }
 
         public readonly string provider;
         public readonly string action;
         public readonly string file;
         public readonly float progress;
+        public readonly string playlist;
+        public readonly int playlist_current;
+        public readonly int playlist_total;
     }
 
     public class YTdlpErrorEventArgs : EventArgs
@@ -74,21 +90,20 @@ namespace ytdlp_gui
             ci.NumberFormat.CurrencyDecimalSeparator = ".";
 
             files = new List<string>();
-
-            this.already_downloaded_regex = new Regex(@"\[download\]\s+(.+) has already been downloaded");
-            this.download_regex = new Regex(@"([0-9.]+)%\s+of\s+([0-9.]+)(\w+)\s+at\s+([0-9.]+)(\w+\/\w+)\sETA\s(\d+:\d+)");
-            this.download_finish_regex = new Regex(@"([0-9.]+)%\s+of\s+([0-9.]+)(\w+)\s+in\s+(\d+:\d+:\d+)\s+at\s+([0-9.]+)(\w+\/\w+)");
-            this.merge_regex = new Regex(@"Merging formats into ""(.+)""");
         }
 
-        public async Task<string> Run()
+        public async Task<string[]> Run()
         {
             process.Start();
 
-            string line = null;
+            string stdout = "";
+            int playlist_last = playlist_current;
+            string line;
             bool first = true;
             while ((line = await process.StandardOutput.ReadLineAsync()) != null)
             {
+                Console.WriteLine(line);
+                stdout += line;
                 if (first)
                 {
                     provider = (new Regex(@"\w+")).Match(line).Value;
@@ -96,12 +111,14 @@ namespace ytdlp_gui
                 }
                 line = line.Trim();
 
+                /*
                 Match match = this.already_downloaded_regex.Match(line);
                 if (match.Success)
                 {
                     file = match.Groups[1].Value;
                     break;
                 }
+                */
 
                 if (line.StartsWith("[info] "))
                     ProgInfo(line.Substring("[info] ".Length).TrimStart());
@@ -111,14 +128,46 @@ namespace ytdlp_gui
 
                 if (line.StartsWith("[Merger] "))
                     ProgMerger(line.Substring("[Merger] ".Length).TrimStart());
+
+                if (line.StartsWith("[youtube:tab] "))
+                    ProgYoutube(line.Substring("[youtube:tab] ".Length).TrimStart());
+
+                if (playlist_last != playlist_current)
+                {
+                    playlist_last = playlist_current;
+                    if (File != null)
+                        Finished?.Invoke(this, new YTdlpFinishedEventArgs(provider, File, files.ToArray()));
                 }
+            }
+
+            if (stop)
+                return new string[0];
 
             process.WaitForExit();
-            process.Close();
+            if (process.ExitCode == 0)
+            {
+                if (File != null)
                     Finished?.Invoke(this, new YTdlpFinishedEventArgs(provider, File, files.ToArray()));
-
-            return null;
             }
+            else
+                Error?.Invoke(this, new YTdlpErrorEventArgs(provider, stdout));
+
+            return files.ToArray();
+        }
+
+        public void Cancel()
+        {
+            stop = true;
+            if (!process.HasExited) try
+            {
+                ProcessUtil.KillProcessAndChildren(process.Id);
+            }
+            catch (Exception) { /* We tried ¯\_(ツ)_/¯ */ }
+            process.WaitForExit();
+        }
+
+        [DllImport("kernel32.dll")]
+        private static extern int GetParentProcessId(int processId);
 
         protected void ProgInfo(string line)
         {
@@ -147,7 +196,10 @@ namespace ytdlp_gui
                     provider,
                     "download",
                     File,
-                    progress
+                    progress,
+                    playlist,
+                    playlist_current,
+                    playlist_total
                 );
                 Progress?.Invoke(this, args);
             }
@@ -167,10 +219,21 @@ namespace ytdlp_gui
                     provider,
                     "download",
                     File,
-                    progress
+                    progress,
+                    playlist,
+                    playlist_current,
+                    playlist_total
                 );
                 Progress?.Invoke(this, args);
             }
+
+            match = download_playlist_item_regex.Match(line);
+            if (match.Success)
+            {
+                GroupCollection groups = match.Groups;
+                playlist_current = int.Parse(groups[1].Value);
+                playlist_total = int.Parse(groups[2].Value);
+            }
         }
 
         protected void ProgMerger(string line)
@@ -186,12 +249,30 @@ namespace ytdlp_gui
                     provider,
                     "merge",
                     file,
-                    1
+                    1,
+                    playlist,
+                    playlist_current,
+                    playlist_total
                 );
                 Progress?.Invoke(this, args);
             }
         }
 
+        protected void ProgYoutube(string line)
+        {
+            Match match;
+
+            match = download_playlist_regex.Match(line);
+            if (match.Success)
+            {
+                playlist = match.Groups[1].Value;
+                // How much we downloading
+                playlist_total = int.Parse(match.Groups[2].Value);
+                // How much there is
+                // playlist_total = int.Parse(match.Groups[3].Value);
+            }
+        }
+
         private float ParseFloat(string str)
         {
             return float.Parse(str, NumberStyles.Any, ci);
@@ -199,11 +280,17 @@ namespace ytdlp_gui
 
         private readonly Process process;
         private readonly CultureInfo ci;
-        private readonly Regex already_downloaded_regex;
+        private readonly Regex download_playlist_regex = new Regex(@"Playlist (.+):\s+Downloading\s+(\d+)\s+items\s+of\s+(\d+)");
-        private readonly Regex download_regex;
+        private readonly Regex download_playlist_item_regex = new Regex(@"Downloading\s+item\s(\d+)\s+of\s+(\d+)");
-        private readonly Regex download_finish_regex;
+        private readonly Regex already_downloaded_regex = new Regex(@"\[download\]\s+(.+) has already been downloaded");
-        private readonly Regex merge_regex;
+        private readonly Regex download_regex = new Regex(@"([0-9.]+)%\s+of\s*~?\s+([0-9.]+)(\w+)\s+at\s+([0-9.]+)(\w+\/\w+)\sETA\s(\d+:\d+)");
+        private readonly Regex download_finish_regex = new Regex(@"([0-9.]+)%\s+of\s+([0-9.]+)(\w+)\s+in\s+(\d+:\d+:\d+)\s+at\s+([0-9.]+)(\w+\/\w+)");
+        private readonly Regex merge_regex = new Regex(@"Merging formats into ""(.+)""");
         private string provider;
+        private string playlist;
+        private int playlist_current = 1;
+        private int playlist_total = 1;
+        private bool stop = false;
         private string File {
             get { return file; }
             set { file = value; if (!files.Contains(value)) files.Add(value); }
@@ -237,7 +324,7 @@ namespace ytdlp_gui
             process.StartInfo.UseShellExecute = false;
             process.StartInfo.CreateNoWindow = true;
             process.StartInfo.RedirectStandardOutput = true;
-            process.StartInfo.RedirectStandardError = true;
+            // process.StartInfo.RedirectStandardError = true;
             process.StartInfo.WorkingDirectory = workdir;
 
             return new YTdlpProcess(process);

ytdlp-gui.csproj

@@ -35,6 +35,7 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Management" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
@@ -60,6 +61,7 @@
       <DependentUpon>Main.cs</DependentUpon>
     </Compile>
     <Compile Include="App.cs" />
+    <Compile Include="ProcessUtil.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="YTdlp.cs" />