Always use ToLowerInvariant

Code/Data/AI.cs

@@ -18,7 +18,7 @@ namespace Flowframes.Data
         public string NameLong { get; set; } = "";
         public string FriendlyName { get { return $"{NameShort} ({GetFrameworkString(Backend)})"; } }
         public string Description { get { return $"{GetImplemString(Backend)} of {NameShort}{(Backend == AiBackend.Pytorch ? " (Nvidia Only!)" : "")}"; } }
-        public string PkgDir { get { return NameInternal.Replace("_", "-").ToLower(); } }
+        public string PkgDir { get { return NameInternal.Replace("_", "-").ToLowerInvariant(); } }
         public enum InterpFactorSupport { Fixed, AnyPowerOfTwo, AnyInteger, AnyFloat }
         public InterpFactorSupport FactorSupport { get; set; } = InterpFactorSupport.Fixed;
         public int[] SupportedFactors { get; set; } = new int[0];

Code/Data/InterpSettings.cs

@@ -186,7 +186,7 @@ namespace Flowframes
                 bool gif = outMode == Interpolate.OutMode.VidGif;
                 bool proResAlpha = outMode == Interpolate.OutMode.VidProRes && Config.GetInt(Config.Key.proResProfile) > 3;
                 bool outputSupportsAlpha = png || gif || proResAlpha;
-                string ext = inputIsFrames ? Path.GetExtension(IoUtils.GetFilesSorted(inPath).First()).ToLower() : Path.GetExtension(inPath).ToLower();
+                string ext = inputIsFrames ? Path.GetExtension(IoUtils.GetFilesSorted(inPath).First()).ToLowerInvariant() : Path.GetExtension(inPath).ToLowerInvariant();
                 alpha = (alphaModel && outputSupportsAlpha && (ext == ".gif" || ext == ".png" || ext == ".apng" || ext == ".mov"));
                 Logger.Log($"RefreshAlpha: model.supportsAlpha = {alphaModel} - outputSupportsAlpha = {outputSupportsAlpha} - " +
                            $"input ext: {ext} => alpha = {alpha}", true);

Code/Data/SubtitleTrack.cs

@@ -13,7 +13,7 @@ namespace Flowframes.Data
         {
             streamIndex = streamNum;
             lang = metaStr.Trim().Replace("_", ".").Replace(" ", ".");
-            //langFriendly = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(metaStr.ToLower().Trim().Replace("_", ".").Replace(" ", "."));
+            //langFriendly = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(metaStr.ToLowerInvariant().Trim().Replace("_", ".").Replace(" ", "."));
             encoding = encodingStr.Trim();
         }
     }

Code/Extensions/ExtensionMethods.cs

@@ -253,7 +253,7 @@ namespace Flowframes
         {
             try
             {
-                return Path.GetExtension(filePath)?.ToLower() == ".concat";
+                return Path.GetExtension(filePath)?.ToLowerInvariant() == ".concat";
             }
             catch
             {

Code/Form1.cs

@@ -150,7 +150,7 @@ namespace Flowframes
         {
             foreach (TabPage tab in mainTabControl.TabPages)
             {
-                if (tab.Text.ToLower() == tabName.ToLower())
+                if (tab.Text.ToLowerInvariant() == tabName.ToLowerInvariant())
                     mainTabControl.SelectedTab = tab;
             }
 
@@ -362,13 +362,13 @@ namespace Flowframes
         Interpolate.OutMode GetOutMode()
         {
             Interpolate.OutMode outMode = Interpolate.OutMode.VidMp4;
-            if (outModeCombox.Text.ToLower().Contains("mkv")) outMode = Interpolate.OutMode.VidMkv;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("mkv")) outMode = Interpolate.OutMode.VidMkv;
-            if (outModeCombox.Text.ToLower().Contains("webm")) outMode = Interpolate.OutMode.VidWebm;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("webm")) outMode = Interpolate.OutMode.VidWebm;
-            if (outModeCombox.Text.ToLower().Contains("prores")) outMode = Interpolate.OutMode.VidProRes;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("prores")) outMode = Interpolate.OutMode.VidProRes;
-            if (outModeCombox.Text.ToLower().Contains("avi")) outMode = Interpolate.OutMode.VidAvi;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("avi")) outMode = Interpolate.OutMode.VidAvi;
-            if (outModeCombox.Text.ToLower().Contains("gif")) outMode = Interpolate.OutMode.VidGif;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("gif")) outMode = Interpolate.OutMode.VidGif;
-            if (outModeCombox.Text.ToLower().Contains("image")) outMode = Interpolate.OutMode.ImgPng;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("image")) outMode = Interpolate.OutMode.ImgPng;
-            if (outModeCombox.Text.ToLower().Contains("real")) outMode = Interpolate.OutMode.Realtime;
+            if (outModeCombox.Text.ToLowerInvariant().Contains("real")) outMode = Interpolate.OutMode.Realtime;
             return outMode;
         }
 
@@ -378,7 +378,7 @@ namespace Flowframes
 
             for (int i = 0; i < outModeCombox.Items.Count; i++)
             {
-                string currentItem = outModeCombox.Items[i].ToString().ToLower();
+                string currentItem = outModeCombox.Items[i].ToString().ToLowerInvariant();
                 if (mode == Interpolate.OutMode.VidMkv && currentItem.Contains("mkv")) targetIndex = i;
                 if (mode == Interpolate.OutMode.VidWebm && currentItem.Contains("webm")) targetIndex = i;
                 if (mode == Interpolate.OutMode.VidProRes && currentItem.Contains("prores")) targetIndex = i;

Code/IO/IoUtils.cs

@@ -315,7 +315,7 @@ namespace Flowframes.IO
 		public static async Task<Fraction> GetVideoFramerate (string path)
         {
 			string[] preferFfmpegReadoutFormats = new string[] { ".gif", ".png", ".apng", ".webp" };
-			bool preferFfmpegReadout = preferFfmpegReadoutFormats.Contains(Path.GetExtension(path).ToLower());
+			bool preferFfmpegReadout = preferFfmpegReadoutFormats.Contains(Path.GetExtension(path).ToLowerInvariant());
 
             Fraction fps = new Fraction();
 

Code/IO/ModelDownloader.cs

@@ -20,7 +20,7 @@ namespace Flowframes.IO
             string custServer = Config.Get(Config.Key.customServer);
             string server = custServer.Trim().Length > 3 ? custServer : Servers.GetServer().GetUrl();
             string baseUrl = $"{server}/flowframes/mdl/";
-            return Path.Combine(baseUrl, ai.ToLower(), relPath);
+            return Path.Combine(baseUrl, ai.ToLowerInvariant(), relPath);
         }
 
         static string GetMdlFileUrl(string ai, string model, string relPath)

Code/Main/AutoEncode.cs

@@ -54,7 +54,7 @@ namespace Flowframes.Main
             {
                 UpdateChunkAndBufferSizes();
 
-                bool imgSeq = Interpolate.currentSettings.outMode.ToString().ToLower().StartsWith("img");
+                bool imgSeq = Interpolate.currentSettings.outMode.ToString().ToLowerInvariant().StartsWith("img");
                 interpFramesFolder = interpFramesPath;
                 videoChunksFolder = Path.Combine(interpFramesPath.GetParentDir(), Paths.chunksDir);
 

Code/Main/Export.cs

@@ -30,7 +30,7 @@ namespace Flowframes.Main
                 await Blend.BlendSceneChanges(frameFile);
             }
             
-            if (!mode.ToString().ToLower().Contains("vid"))     // Copy interp frames out of temp folder and skip video export for image seq export
+            if (!mode.ToString().ToLowerInvariant().Contains("vid"))     // Copy interp frames out of temp folder and skip video export for image seq export
             {
                 try
                 {
@@ -139,7 +139,7 @@ namespace Flowframes.Main
 
         static int GetImgSeqQ (string format)
         {
-            if(format.ToLower() == "jpg" || format.ToLower() == "jpeg")
+            if(format.ToLowerInvariant() == "jpg" || format.ToLowerInvariant() == "jpeg")
             {
                 switch (Config.GetInt(Config.Key.imgSeqQuality))
                 {
@@ -151,7 +151,7 @@ namespace Flowframes.Main
                 }
             }
 
-            if (format.ToLower() == "webp")
+            if (format.ToLowerInvariant() == "webp")
             {
                 switch (Config.GetInt(Config.Key.imgSeqQuality))
                 {
@@ -307,7 +307,7 @@ namespace Flowframes.Main
 
             bool dontEncodeFullFpsVid = fpsLimit && Config.GetInt(Config.Key.maxFpsMode) == 0;
 
-            if (mode.ToString().ToLower().StartsWith("img"))    // Image Sequence output mode, not video
+            if (mode.ToString().ToLowerInvariant().StartsWith("img"))    // Image Sequence output mode, not video
             {
                 string desiredFormat = Config.Get(Config.Key.imgSeqFormat);
                 string availableFormat = Path.GetExtension(IoUtils.GetFilesSorted(interpDir)[0]).Remove(".").ToUpper();

Code/Main/InterpolateUtils.cs

@@ -229,14 +229,14 @@ namespace Flowframes.Main
             float maxFps = Config.GetFloat(Config.Key.maxFps);
             float encodeFps = maxFps > 0 ? interpFps.Clamp(0, maxFps) : interpFps;
 
-            if (enc.ToLower().Contains("av1") && encodeFps > maxAv1Fps)
+            if (enc.ToLowerInvariant().Contains("av1") && encodeFps > maxAv1Fps)
             {
                 UiUtils.ShowMessageBox($"The selected encoder only supports up to {maxAv1Fps} FPS!\nPlease use a different encoder or reduce the interpolation factor.", UiUtils.MessageType.Error);
                 I.Cancel();
                 return false;
             }
 
-            if (enc.ToLower().Contains("nvenc") && !(await FfmpegCommands.IsEncoderCompatible(enc)))
+            if (enc.ToLowerInvariant().Contains("nvenc") && !(await FfmpegCommands.IsEncoderCompatible(enc)))
             {
                 UiUtils.ShowMessageBox("NVENC encoding is not available on your hardware!\nPlease use a different encoder.", UiUtils.MessageType.Error);
                 I.Cancel();

Code/Media/FfmpegCommands.cs

@@ -224,7 +224,7 @@ namespace Flowframes
             try
             {
                 string[] lines = info.SplitIntoLines();
-                string lastLine = lines.Last().ToLower();
+                string lastLine = lines.Last().ToLowerInvariant();
                 return lastLine.Substring(0, lastLine.IndexOf("fps")).GetInt();
             }
             catch
@@ -245,7 +245,7 @@ namespace Flowframes
             Logger.Log($"IsEncoderCompatible('{enc}')", true, false, "ffmpeg");
             string args = $"-loglevel error -f lavfi -i color=black:s=540x540 -vframes 1 -an -c:v {enc} -f null -";
             string output = await RunFfmpeg(args, LogMode.Hidden);
-            return !output.ToLower().Contains("error");
+            return !output.ToLowerInvariant().Contains("error");
         }
 
         public static string GetAudioCodec(string path, int streamIndex = -1)

Code/Media/FfmpegEncode.cs

@@ -84,7 +84,7 @@ namespace Flowframes.Media
             Directory.CreateDirectory(outDir);
             string inArg = $"-f concat -i {Path.GetFileName(framesFile)}";
             string linksDir = Path.Combine(framesFile + Paths.symlinksSuffix);
-            format = format.ToLower();
+            format = format.ToLowerInvariant();
 
             if (Config.GetBool(Config.Key.allowSymlinkEncoding, true) && Symlinks.SymlinksAllowed())
             {

Code/Media/FfmpegExtract.cs

@@ -44,7 +44,7 @@ namespace Flowframes.Media
 
         static string GetImgArgs(string extension, bool includePixFmt = true, bool alpha = false)
         {
-            extension = extension.ToLower().Remove(".").Replace("jpeg", "jpg");
+            extension = extension.ToLowerInvariant().Remove(".").Replace("jpeg", "jpg");
             string pixFmt = "-pix_fmt rgb24";
             string args = "";
 
@@ -278,7 +278,7 @@ namespace Flowframes.Media
         public static async Task ImportSingleImage(string inputFile, string outPath, Size size)
         {
             string sizeStr = (size.Width > 1 && size.Height > 1) ? $"-s {size.Width}x{size.Height}" : "";
-            bool isPng = (Path.GetExtension(outPath).ToLower() == ".png");
+            bool isPng = (Path.GetExtension(outPath).ToLowerInvariant() == ".png");
             string comprArg = isPng ? pngCompr : "";
             string pixFmt = "-pix_fmt " + (isPng ? $"rgb24 {comprArg}" : "yuvj420p");
             string args = $"-i {inputFile.Wrap()} {comprArg} {sizeStr} {pixFmt} -vf {GetPadFilter()} {outPath.Wrap()}";
@@ -287,7 +287,7 @@ namespace Flowframes.Media
 
         public static async Task ExtractSingleFrame(string inputFile, string outputPath, int frameNum)
         {
-            bool isPng = (Path.GetExtension(outputPath).ToLower() == ".png");
+            bool isPng = (Path.GetExtension(outputPath).ToLowerInvariant() == ".png");
             string comprArg = isPng ? pngCompr : "";
             string pixFmt = "-pix_fmt " + (isPng ? $"rgb24 {comprArg}" : "yuvj420p");
             string args = $"-i {inputFile.Wrap()} -vf \"select=eq(n\\,{frameNum})\" -vframes 1 {pixFmt} {outputPath.Wrap()}";
@@ -302,7 +302,7 @@ namespace Flowframes.Media
             if (IoUtils.IsPathDirectory(outputPath))
                 outputPath = Path.Combine(outputPath, "last.png");
 
-            bool isPng = (Path.GetExtension(outputPath).ToLower() == ".png");
+            bool isPng = (Path.GetExtension(outputPath).ToLowerInvariant() == ".png");
             string comprArg = isPng ? pngCompr : "";
             string pixFmt = "-pix_fmt " + (isPng ? $"rgb24 {comprArg}" : "yuvj420p");
             string sizeStr = (size.Width > 1 && size.Height > 1) ? $"-s {size.Width}x{size.Height}" : "";

Code/Media/FfmpegUtils.cs

@@ -75,7 +75,7 @@ namespace Flowframes.Media
                             string title = await GetFfprobeInfoAsync(path, showStreams, "TAG:title", idx);
                             string codec = await GetFfprobeInfoAsync(path, showStreams, "codec_name", idx);
                             string profile = await GetFfprobeInfoAsync(path, showStreams, "profile", idx);
-                            if (codec.ToLower() == "dts" && profile != "unknown") codec = profile;
+                            if (codec.ToLowerInvariant() == "dts" && profile != "unknown") codec = profile;
                             string codecLong = await GetFfprobeInfoAsync(path, showStreams, "codec_long_name", idx);
                             int kbits = (await GetFfprobeInfoAsync(path, showStreams, "bit_rate", idx)).GetInt() / 1024;
                             int sampleRate = (await GetFfprobeInfoAsync(path, showStreams, "sample_rate", idx)).GetInt();
@@ -223,14 +223,14 @@ namespace Flowframes.Media
 
             if (codec == Codec.H264)
             {
-                string preset = Config.Get(Config.Key.ffEncPreset).ToLower().Remove(" ");
+                string preset = Config.Get(Config.Key.ffEncPreset).ToLowerInvariant().Remove(" ");
                 string g = GetKeyIntArg(fps, keyint);
                 return new string[] { $"-c:v {GetEnc(codec)} -crf {Config.GetInt(Config.Key.h264Crf)} -preset {preset} {g} -pix_fmt {GetPixFmt()}" };
             }
 
             if (codec == Codec.H265)
             {
-                string preset = Config.Get(Config.Key.ffEncPreset).ToLower().Remove(" ");
+                string preset = Config.Get(Config.Key.ffEncPreset).ToLowerInvariant().Remove(" ");
                 int crf = Config.GetInt(Config.Key.h265Crf);
                 string g = GetKeyIntArg(fps, keyint);
                 return new string[] { $"-c:v {GetEnc(codec)} {(crf > 0 ? $"-crf {crf}" : "-x265-params lossless=1")} -preset {preset} {g} -pix_fmt {GetPixFmt()}" };
@@ -318,7 +318,7 @@ namespace Flowframes.Media
 
         static string GetVp9Speed()
         {
-            string preset = Config.Get(Config.Key.ffEncPreset).ToLower().Remove(" ");
+            string preset = Config.Get(Config.Key.ffEncPreset).ToLowerInvariant().Remove(" ");
             string arg = "";
 
             if (preset == "veryslow") arg = "0";
@@ -334,7 +334,7 @@ namespace Flowframes.Media
 
         static string GetSvtAv1Speed()
         {
-            string preset = Config.Get(Config.Key.ffEncPreset).ToLower().Remove(" ");
+            string preset = Config.Get(Config.Key.ffEncPreset).ToLowerInvariant().Remove(" ");
             string arg = "8";
 
             if (preset == "veryslow") arg = "3";
@@ -499,12 +499,12 @@ namespace Flowframes.Media
             if (validExtensions == null)
                 validExtensions = new List<string>();
 
-            validExtensions = validExtensions.Select(x => x.Remove(".").ToLower()).ToList(); // Ignore "." in extensions
+            validExtensions = validExtensions.Select(x => x.Remove(".").ToLowerInvariant()).ToList(); // Ignore "." in extensions
             string concatFileContent = "";
             string[] files = IoUtils.GetFilesSorted(inputFilesDir);
             int fileCount = 0;
 
-            foreach (string file in files.Where(x => validExtensions.Contains(Path.GetExtension(x).Replace(".", "").ToLower())))
+            foreach (string file in files.Where(x => validExtensions.Contains(Path.GetExtension(x).Replace(".", "").ToLowerInvariant())))
             {
                 fileCount++;
                 concatFileContent += $"file '{file.Replace(@"\", "/")}'\n";

Code/Media/GetVideoInfo.cs

@@ -79,13 +79,13 @@ namespace Flowframes.Media
                 if (stripKeyName)
                 {
 
-                    List<string> filtered = output.SplitIntoLines().Where(x => x.ToLower().Contains(lineFilter.ToLower())).ToList();    // Filter
+                    List<string> filtered = output.SplitIntoLines().Where(x => x.ToLowerInvariant().Contains(lineFilter.ToLowerInvariant())).ToList();    // Filter
                     filtered = filtered.Select(x => string.Join("", x.Split('=').Skip(1))).ToList();    // Ignore everything before (and including) the first '=' sign
                     output = string.Join("\n", filtered);
                 }
                 else
                 {
-                    output = string.Join("\n", output.SplitIntoLines().Where(x => x.ToLower().Contains(lineFilter.ToLower())).ToArray());
+                    output = string.Join("\n", output.SplitIntoLines().Where(x => x.ToLowerInvariant().Contains(lineFilter.ToLowerInvariant())).ToArray());
                 }
             }
 

Code/Os/AiProcess.cs

@@ -130,8 +130,8 @@ namespace Flowframes.Os
                 {
                     if (AvProcess.lastAvProcess != null && !AvProcess.lastAvProcess.HasExited)
                     {
-                        if (Logger.LastLogLine.ToLower().Contains("frame: "))
+                        if (Logger.LastLogLine.ToLowerInvariant().Contains("frame: "))
-                            Logger.Log(FormatUtils.BeautifyFfmpegStats(Logger.LastLogLine), false, Logger.LastUiLine.ToLower().Contains("frame"));
+                            Logger.Log(FormatUtils.BeautifyFfmpegStats(Logger.LastLogLine), false, Logger.LastUiLine.ToLowerInvariant().Contains("frame"));
                     }
 
                     if (AvProcess.lastAvProcess.HasExited && !AutoEncode.HasWorkToDo())     // Stop logging if ffmpeg is not running & AE is done
@@ -316,7 +316,7 @@ namespace Flowframes.Os
             string ttaStr = Config.GetBool(Config.Key.rifeNcnnUseTta, false) ? "-x" : "";
 
             rifeNcnn.StartInfo.Arguments = $"{OsUtils.GetCmdArg()} cd /D {Path.Combine(Paths.GetPkgPath(), Implementations.rifeNcnn.PkgDir).Wrap()} & rife-ncnn-vulkan.exe " +
-                $" -v -i {inPath.Wrap()} -o {outPath.Wrap()} {frames} -m {mdl.ToLower()} {ttaStr} {uhdStr} -g {Config.Get(Config.Key.ncnnGpus)} -f {NcnnUtils.GetNcnnPattern()} -j {NcnnUtils.GetNcnnThreads()}";
+                $" -v -i {inPath.Wrap()} -o {outPath.Wrap()} {frames} -m {mdl.ToLowerInvariant()} {ttaStr} {uhdStr} -g {Config.Get(Config.Key.ncnnGpus)} -f {NcnnUtils.GetNcnnPattern()} -j {NcnnUtils.GetNcnnThreads()}";
 
             Logger.Log("cmd.exe " + rifeNcnn.StartInfo.Arguments, true);
 
@@ -453,7 +453,7 @@ namespace Flowframes.Os
             SetProgressCheck(outPath, factor);
             int targetFrames = ((IoUtils.GetAmountOfFiles(lastInPath, false, "*.*") * factor).RoundToInt());
 
-            string args = $" -v -i {framesPath.Wrap()} -o {outPath.Wrap()} -n {targetFrames} -m {mdl.ToLower()}" +
+            string args = $" -v -i {framesPath.Wrap()} -o {outPath.Wrap()} -n {targetFrames} -m {mdl.ToLowerInvariant()}" +
                 $" -t {NcnnUtils.GetNcnnTilesize(tilesize)} -g {Config.Get(Config.Key.ncnnGpus)} -f {NcnnUtils.GetNcnnPattern()} -j 2:1:2";
 
             dain.StartInfo.Arguments = $"{OsUtils.GetCmdArg()} cd /D {dainDir.Wrap()} & dain-ncnn-vulkan.exe {args}";
@@ -615,26 +615,26 @@ namespace Flowframes.Os
                 if (line.Contains("ff:nocuda-cpu"))
                     Logger.Log("WARNING: CUDA-capable GPU device is not available, running on CPU instead!");
 
-                if (!hasShownError && err && line.ToLower().Contains("modulenotfounderror"))
+                if (!hasShownError && err && line.ToLowerInvariant().Contains("modulenotfounderror"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"A python module is missing.\nCheck {ai.LogFilename} for details.\n\n{line}", UiUtils.MessageType.Error);
                 }
 
-                if (!hasShownError && line.ToLower().Contains("no longer supports this gpu"))
+                if (!hasShownError && line.ToLowerInvariant().Contains("no longer supports this gpu"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"Your GPU seems to be outdated and is not supported!\n\n{line}", UiUtils.MessageType.Error);
                 }
 
-                if (!hasShownError && line.ToLower().Contains("error(s) in loading state_dict"))
+                if (!hasShownError && line.ToLowerInvariant().Contains("error(s) in loading state_dict"))
                 {
                     hasShownError = true;
                     string msg = (Interpolate.currentSettings.ai.NameInternal == Implementations.flavrCuda.NameInternal) ? "\n\nFor FLAVR, you need to select the correct model for each scale!" : "";
                     UiUtils.ShowMessageBox($"Error loading the AI model!\n\n{line}{msg}", UiUtils.MessageType.Error);
                 }
 
-                if (!hasShownError && line.ToLower().Contains("unicodeencodeerror"))
+                if (!hasShownError && line.ToLowerInvariant().Contains("unicodeencodeerror"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"It looks like your path contains invalid characters - remove them and try again!\n\n{line}", UiUtils.MessageType.Error);
@@ -678,32 +678,32 @@ namespace Flowframes.Os
 
             if (ai.Piped) // VS specific
             {
-                if (!hasShownError && Interpolate.currentSettings.outMode != Interpolate.OutMode.Realtime && line.ToLower().Contains("fwrite() call failed"))
+                if (!hasShownError && Interpolate.currentSettings.outMode != Interpolate.OutMode.Realtime && line.ToLowerInvariant().Contains("fwrite() call failed"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"VapourSynth interpolation failed with an unknown error. Check the log for details:\n\n{lastLogLines}", UiUtils.MessageType.Error);
                 }
 
-                if (!hasShownError && line.ToLower().Contains("allocate memory failed"))
+                if (!hasShownError && line.ToLowerInvariant().Contains("allocate memory failed"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"Out of memory!\nTry reducing your RAM usage by closing some programs.\n\n{line}", UiUtils.MessageType.Error);
                 }
 
-                if (!hasShownError && line.ToLower().Contains("vapoursynth.error:"))
+                if (!hasShownError && line.ToLowerInvariant().Contains("vapoursynth.error:"))
                 {
                     hasShownError = true;
                     UiUtils.ShowMessageBox($"VapourSynth Error:\n\n{line}", UiUtils.MessageType.Error);
                 }
             }
 
-            if (!hasShownError && err && line.ToLower().Contains("out of memory"))
+            if (!hasShownError && err && line.ToLowerInvariant().Contains("out of memory"))
             {
                 hasShownError = true;
                 UiUtils.ShowMessageBox($"Your GPU ran out of VRAM! Please try a video with a lower resolution or use the Max Video Size option in the settings.\n\n{line}", UiUtils.MessageType.Error);
             }
 
-            if (!hasShownError && line.ToLower().Contains("illegal memory access"))
+            if (!hasShownError && line.ToLowerInvariant().Contains("illegal memory access"))
             {
                 hasShownError = true;
                 UiUtils.ShowMessageBox($"Your GPU appears to be unstable! If you have an overclock enabled, please disable it!\n\n{line}", UiUtils.MessageType.Error);

Code/Os/OsUtils.cs

@@ -150,7 +150,7 @@ namespace Flowframes.Os
                     char pathDriveLetter = (path[0].ToString().ToUpper())[0];
                     foreach (var detectedDrive in detectedDrives)
                     {
-                        if (detectedDrive.DriveLetter == pathDriveLetter && detectedDrive.HardwareType.ToString().ToLower().Trim() == "ssd")
+                        if (detectedDrive.DriveLetter == pathDriveLetter && detectedDrive.HardwareType.ToString().ToLowerInvariant().Trim() == "ssd")
                             return true;
                     }
                 }
@@ -296,7 +296,7 @@ namespace Flowframes.Os
                     {
                         string gpuName = property.Value.ToString();
 
-                        if (!gpuName.ToLower().Contains("microsoft"))   // To ignore pseudo-GPUs like on vServers, RDP sessions, etc. (e.g. "Microsoft Basic Display Adapter")
+                        if (!gpuName.ToLowerInvariant().Contains("microsoft"))   // To ignore pseudo-GPUs like on vServers, RDP sessions, etc. (e.g. "Microsoft Basic Display Adapter")
                         {
                             gpus.Add(gpuName);
                             Logger.Log($"[GetGpus] Found GPU: {property.Value}", true);

Code/Os/Python.cs

@@ -151,7 +151,7 @@ namespace Flowframes.Os
             Logger.Log("Checking if system Python is available...", true);
             string sysPyVer = GetSysPyVersion();
 
-            if (!string.IsNullOrWhiteSpace(sysPyVer) && !sysPyVer.ToLower().Contains("not found") && sysPyVer.Length <= 35)
+            if (!string.IsNullOrWhiteSpace(sysPyVer) && !sysPyVer.ToLowerInvariant().Contains("not found") && sysPyVer.Length <= 35)
             {
                 isInstalled = true;
                 Logger.Log("Using Python installation: " + sysPyVer, true);

Code/Os/StartupChecks.cs

@@ -21,7 +21,7 @@ namespace Flowframes.Os
             string[] osInfo = osInfoStr.Split(" | ");
             string version = osInfo[0].Remove("Microsoft").Trim();
 
-            return (version.ToLower().Contains("windows 10") || version.ToLower().Contains("windows 11"));
+            return (version.ToLowerInvariant().Contains("windows 10") || version.ToLowerInvariant().Contains("windows 11"));
         }
 
         static bool Is32Bit()
@@ -38,7 +38,7 @@ namespace Flowframes.Os
 
         public static void CheckOs()
         {
-            if (!File.Exists(Paths.GetVerPath()) && Paths.GetExeDir().ToLower().Contains("temp"))
+            if (!File.Exists(Paths.GetVerPath()) && Paths.GetExeDir().ToLowerInvariant().Contains("temp"))
             {
                 UiUtils.ShowMessageBox("You seem to be running Flowframes out of an archive.\nPlease extract the whole archive first!", UiUtils.MessageType.Error);
                 IoUtils.TryDeleteIfExists(Paths.GetDataPath());
@@ -57,7 +57,7 @@ namespace Flowframes.Os
             if (string.IsNullOrWhiteSpace(version))
                 return;
 
-            if (!version.ToLower().Contains("windows 10") && !version.ToLower().Contains("windows 11") && !Config.GetBool("ignoreIncompatibleOs", false))
+            if (!version.ToLowerInvariant().Contains("windows 10") && !version.ToLowerInvariant().Contains("windows 11") && !Config.GetBool("ignoreIncompatibleOs", false))
             {
                 UiUtils.ShowMessageBox($"This application was made for Windows 10/11 and is not officially compatible with {version}.\n\n" +
                                 $"Use it at your own risk and do NOT ask for support as long as your are on {version}.", UiUtils.MessageType.Warning);

Code/Ui/DebugFormHelper.cs

@@ -54,7 +54,7 @@ namespace Flowframes.Ui
 
         public static void ToggleMonospace(TextBox logBox)
         {
-            bool isMonospace = logBox.Font.Name.ToLower().Contains("consolas");
+            bool isMonospace = logBox.Font.Name.ToLowerInvariant().Contains("consolas");
 
             if (isMonospace)
                 logBox.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.5f);

Code/Utilities/ColorDataUtils.cs

@@ -196,7 +196,7 @@ namespace Flowframes.Utilities
 
         public static int GetColorPrimaries(string s) // Defined by the "Color primaries" section of ISO/IEC 23091-4/ITU-T H.273
         {
-            s = s.Trim().ToLower();
+            s = s.Trim().ToLowerInvariant();
             if (s == "bt709") return 1;
             if (s == "bt470m") return 4;
             if (s == "bt470bg") return 5;
@@ -212,7 +212,7 @@ namespace Flowframes.Utilities
 
         public static int GetColorTransfer(string s) // Defined by the "Transfer characteristics" section of ISO/IEC 23091-4/ITU-T H.273
         {
-            s = s.Trim().ToLower();
+            s = s.Trim().ToLowerInvariant();
             if (s == "bt709") return 1;
             if (s == "gamma22" || s == "bt470m") return 4;
             if (s == "gamma28" || s == "bt470bg") return 5; // BT.470 System B, G (historical)
@@ -234,7 +234,7 @@ namespace Flowframes.Utilities
 
         public static int GetMatrixCoeffs(string s) // Defined by the "Matrix coefficients" section of ISO/IEC 23091-4/ITU-T H.27
         {
-            s = s.Trim().ToLower();
+            s = s.Trim().ToLowerInvariant();
             if (s == "bt709") return 1;
             if (s == "fcc") return 4; // US FCC 73.628
             if (s == "bt470bg") return 5; // BT.470 System B, G (historical)
@@ -252,7 +252,7 @@ namespace Flowframes.Utilities
 
         public static int GetColorRange(string s) // Defined by the "Matrix coefficients" section of ISO/IEC 23091-4/ITU-T H.27
         {
-            s = s.Trim().ToLower();
+            s = s.Trim().ToLowerInvariant();
             if (s == "tv") return 1; // TV
             if (s == "pc") return 2; // PC/Full
             return 0; // Fallback: Unspecified