Use small preview mkv for ASSA style windows

installer/Subtitle_Edit_installer.iss

@@ -236,6 +236,9 @@ Source: ..\Dictionaries\en_US.dic;                 DestDir: {userappdata}\Subtit
 Source: ..\Ocr\Latin.db;                           DestDir: {userappdata}\Subtitle Edit\Ocr;          Flags: ignoreversion uninsneveruninstall onlyifdoesntexist; Components: main
 Source: ..\Ocr\Latin.nocr;                         DestDir: {userappdata}\Subtitle Edit\Ocr;          Flags: ignoreversion uninsneveruninstall onlyifdoesntexist; Components: main
 
+Source: ..\preview.mkv;                            DestDir: {userappdata}\Subtitle Edit;              Flags: ignoreversion uninsneveruninstall onlyifdoesntexist; Components: main
+
+
 #ifdef localize
 Source: {#bindir}\Languages\ar-EG.xml;             DestDir: {app}\Languages;                          Flags: ignoreversion; Components: translations
 Source: {#bindir}\Languages\bg-BG.xml;             DestDir: {app}\Languages;                          Flags: ignoreversion; Components: translations
@@ -619,6 +622,7 @@ begin
   RemoveDir(ExpandConstant('{userappdata}\Subtitle Edit\Dictionaries'));
   DeleteFile(ExpandConstant('{userappdata}\Subtitle Edit\Ocr\Latin.db'));
   DeleteFile(ExpandConstant('{userappdata}\Subtitle Edit\Ocr\Latin.nocr'));
+  DeleteFile(ExpandConstant('{userappdata}\Subtitle Edit\preview.mkv'));
   DelTree(ExpandConstant('{userappdata}\Subtitle Edit\Ocr\*.*'), False, True, False);
   RemoveDir(ExpandConstant('{userappdata}\Subtitle Edit\Ocr'));
   DelTree(ExpandConstant('{userappdata}\Subtitle Edit\Plugins\*.*'), False, True, False);

src/ui/Forms/Assa/ApplyCustomStyles.cs

@@ -343,23 +343,8 @@ namespace Nikse.SubtitleEdit.Forms.Assa
 
         private bool GeneratePreviewViaMpv()
         {
-            var fileName = Path.Combine(Configuration.DataDirectory, "preview.mp4");
+            var fileName = VideoPreviewGenerator.GetVideoPreviewFileName();
-            if (!File.Exists(fileName))
+            if (string.IsNullOrEmpty(fileName) || !LibMpvDynamic.IsInstalled)
-            {
-                var isFfmpegAvailable = !Configuration.IsRunningOnWindows || !string.IsNullOrEmpty(Configuration.Settings.General.FFmpegLocation) && File.Exists(Configuration.Settings.General.FFmpegLocation);
-                if (!isFfmpegAvailable)
-                {
-                    return false;
-                }
-
-                using (var p = GetFFmpegProcess(fileName))
-                {
-                    p.Start();
-                    p.WaitForExit();
-                }
-            }
-
-            if (!LibMpvDynamic.IsInstalled)
             {
                 return false;
             }
@@ -377,26 +362,6 @@ namespace Nikse.SubtitleEdit.Forms.Assa
             return true;
         }
 
-        public static Process GetFFmpegProcess(string outputFileName)
-        {
-            var ffmpegLocation = Configuration.Settings.General.FFmpegLocation;
-            if (!Configuration.IsRunningOnWindows && (string.IsNullOrEmpty(ffmpegLocation) || !File.Exists(ffmpegLocation)))
-            {
-                ffmpegLocation = "ffmpeg";
-            }
-
-            return new Process
-            {
-                StartInfo =
-                {
-                    FileName = ffmpegLocation,
-                    Arguments = $"-t 1 -f lavfi -i color=c=blue:s=720x480 -c:v libx264 -tune stillimage -pix_fmt yuv420p \"{outputFileName}\"",
-                    UseShellExecute = false,
-                    CreateNoWindow = true
-                }
-            };
-        }
-
         private void VideoLoaded(object sender, EventArgs e)
         {
             var format = new AdvancedSubStationAlpha();
@@ -408,7 +373,7 @@ namespace Nikse.SubtitleEdit.Forms.Assa
                 var p = new Paragraph(_subtitle.Paragraphs[indices[0]])
                 {
                     StartTime = { TotalMilliseconds = 0 },
-                    EndTime = { TotalMilliseconds = 1000 }
+                    EndTime = { TotalMilliseconds = 2000 }
                 };
                 p.Text = styleToApply + p.Text;
                 subtitle.Paragraphs.Add(p);

src/ui/Forms/Assa/SetPosition.cs

@@ -216,7 +216,7 @@ namespace Nikse.SubtitleEdit.Forms.Assa
 
         private bool GeneratePreviewViaMpv()
         {
-            var fileName = _videoFileName; // Path.Combine(Configuration.DataDirectory, "preview.mp4");
+            var fileName = _videoFileName;
             if (!File.Exists(fileName))
             {
                 var isFfmpegAvailable = !Configuration.IsRunningOnWindows || !string.IsNullOrEmpty(Configuration.Settings.General.FFmpegLocation) && File.Exists(Configuration.Settings.General.FFmpegLocation);

src/ui/Forms/Styles/SubStationAlphaStyles.cs

@@ -407,23 +407,8 @@ namespace Nikse.SubtitleEdit.Forms.Styles
 
         private bool GeneratePreviewViaMpv()
         {
-            var fileName = Path.Combine(Configuration.DataDirectory, "preview.mp4");
+            var fileName = VideoPreviewGenerator.GetVideoPreviewFileName();
-            if (!File.Exists(fileName))
+            if (string.IsNullOrEmpty(fileName) || !LibMpvDynamic.IsInstalled)
-            {
-                var isFfmpegAvailable = !Configuration.IsRunningOnWindows || !string.IsNullOrEmpty(Configuration.Settings.General.FFmpegLocation) && File.Exists(Configuration.Settings.General.FFmpegLocation);
-                if (!isFfmpegAvailable)
-                {
-                    return false;
-                }
-
-                using (var p = GetFFmpegProcess(fileName))
-                {
-                    p.Start();
-                    p.WaitForExit();
-                }
-            }
-
-            if (!LibMpvDynamic.IsInstalled)
             {
                 return false;
             }
@@ -441,26 +426,6 @@ namespace Nikse.SubtitleEdit.Forms.Styles
             return true;
         }
 
-        public static Process GetFFmpegProcess(string outputFileName)
-        {
-            var ffmpegLocation = Configuration.Settings.General.FFmpegLocation;
-            if (!Configuration.IsRunningOnWindows && (string.IsNullOrEmpty(ffmpegLocation) || !File.Exists(ffmpegLocation)))
-            {
-                ffmpegLocation = "ffmpeg";
-            }
-
-            return new Process
-            {
-                StartInfo =
-                {
-                    FileName = ffmpegLocation,
-                    Arguments = $"-t 1 -f lavfi -i color=c=blue:s=720x480 -c:v libx264 -tune stillimage -pix_fmt yuv420p \"{outputFileName}\"",
-                    UseShellExecute = false,
-                    CreateNoWindow = true
-                }
-            };
-        }
-
         private void VideoStartLoaded(object sender, EventArgs e)
         {
             var format = new AdvancedSubStationAlpha();

src/ui/Logic/VideoPreviewGenerator.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Diagnostics;
+using System.Drawing.Imaging;
+using System.IO;
+using Nikse.SubtitleEdit.Core.Common;
+
+namespace Nikse.SubtitleEdit.Logic
+{
+    public class VideoPreviewGenerator
+    {
+        public static string GetVideoPreviewFileName()
+        {
+            var previewFileName = Path.Combine(Configuration.DataDirectory, "preview.mkv");
+            if (File.Exists(previewFileName))
+            {
+                return previewFileName;
+            }
+
+            try
+            {
+                const int rectangleSize = 9;
+                var backgroundImage = TextDesigner.MakeBackgroundImage(720, 480, rectangleSize, Configuration.Settings.General.UseDarkTheme);
+                var tempImageFileName = Path.Combine(Path.GetTempPath(), Guid.NewGuid() + ".png");
+                backgroundImage.Save(tempImageFileName, ImageFormat.Png);
+                var processMakeVideo = GetFFmpegProcess(tempImageFileName, previewFileName, backgroundImage.Width, backgroundImage.Height);
+                processMakeVideo.Start();
+                processMakeVideo.WaitForExit();
+            }
+            catch
+            {
+                return null; 
+            }
+
+            return File.Exists(previewFileName) ? previewFileName : null;
+        }
+
+        private static Process GetFFmpegProcess(string imageFileName, string outputFileName, int videoWidth, int videoHeight)
+        {
+            var ffmpegLocation = Configuration.Settings.General.FFmpegLocation;
+            if (!Configuration.IsRunningOnWindows && (string.IsNullOrEmpty(ffmpegLocation) || !File.Exists(ffmpegLocation)))
+            {
+                ffmpegLocation = "ffmpeg";
+            }
+
+            return new Process
+            {
+                StartInfo =
+                {
+                    FileName = ffmpegLocation,
+                    Arguments = $"-t 3 -loop 1 -i \"{imageFileName}\" -c:v libx264 -tune stillimage -shortest -s {videoWidth}x{videoHeight} \"{outputFileName}\"",
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                }
+            };
+        }
+    }
+}

src/ui/SubtitleEdit.csproj

@@ -1240,6 +1240,7 @@
     <Compile Include="Logic\VideoPlayers\MpcHC\NativeMethods.cs" />
     <Compile Include="Logic\VideoPlayers\QuartsPlayer.cs" />
     <Compile Include="Logic\VideoPlayers\VideoPlayer.cs" />
+    <Compile Include="Logic\VideoPreviewGenerator.cs" />
     <Compile Include="Logic\WordSpellChecker.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />