增加第三方工具的下载地址提示

src/N_m3u8DL-RE.Common/Resource/ResString.cs

@@ -105,6 +105,9 @@ public static class ResString
     public static string fetch => GetText("fetch");
     public static string ffmpegMerge => GetText("ffmpegMerge");
     public static string ffmpegNotFound => GetText("ffmpegNotFound");
+    public static string mkvmergeNotFound => GetText("mkvmergeNotFound");
+    public static string mp4decryptNotFound => GetText("mp4decryptNotFound");
+    public static string shakaPackagerNotFound => GetText("shakaPackagerNotFound");
     public static string fixingTTML => GetText("fixingTTML");
     public static string fixingTTMLmp4 => GetText("fixingTTMLmp4");
     public static string fixingVTT => GetText("fixingVTT");

src/N_m3u8DL-RE.Common/Resource/StaticText.cs

@@ -784,6 +784,24 @@ internal class StaticText
             zhTW: "找不到ffmpeg，請自行下載：https://ffmpeg.org/download.html",
             enUS: "ffmpeg not found, please download at: https://ffmpeg.org/download.html"
         ),
+        ["mkvmergeNotFound"] = new TextContainer
+        (
+            zhCN: "找不到mkvmerge，请自行下载：https://mkvtoolnix.download/downloads.html",
+            zhTW: "找不到mkvmerge，請自行下載：https://mkvtoolnix.download/downloads.html",
+            enUS: "mkvmerge not found, please download at: https://mkvtoolnix.download/downloads.html"
+        ),
+        ["shakaPackagerNotFound"] = new TextContainer
+        (
+            zhCN: "找不到shaka-packager，请自行下载：https://github.com/shaka-project/shaka-packager/releases",
+            zhTW: "找不到shaka-packager，請自行下載：https://github.com/shaka-project/shaka-packager/releases",
+            enUS: "shaka-packager not found, please download at: https://github.com/shaka-project/shaka-packager/releases"
+        ),
+        ["mp4decryptNotFound"] = new TextContainer
+        (
+            zhCN: "找不到mp4decrypt，请自行下载：https://www.bento4.com/downloads/",
+            zhTW: "找不到mp4decrypt，請自行下載：https://www.bento4.com/downloads/",
+            enUS: "mp4decrypt not found, please download at: https://www.bento4.com/downloads/"
+        ),
         ["fixingTTML"] = new TextContainer
         (
             zhCN: "正在提取TTML(raw)字幕...",

src/N_m3u8DL-RE/Program.cs

@@ -139,7 +139,7 @@ static async Task DoWorkAsync(MyOption option)
             option.MkvmergeBinaryPath ??= GlobalUtil.FindExecutable("mkvmerge");
             if (string.IsNullOrEmpty(option.MkvmergeBinaryPath) || !File.Exists(option.MkvmergeBinaryPath))
             {
-                throw new FileNotFoundException("mkvmerge not found");
+                throw new FileNotFoundException(ResString.mkvmergeNotFound);
             }
             Logger.Extra($"mkvmerge => {option.MkvmergeBinaryPath}");
         }
@@ -155,14 +155,14 @@ static async Task DoWorkAsync(MyOption option)
                     var file2 = GlobalUtil.FindExecutable("packager-linux-x64");
                     var file3 = GlobalUtil.FindExecutable("packager-osx-x64");
                     var file4 = GlobalUtil.FindExecutable("packager-win-x64");
-                    if (file == null && file2 == null && file3 == null && file4 == null) throw new FileNotFoundException("shaka-packager not found!");
+                    if (file == null && file2 == null && file3 == null && file4 == null) throw new FileNotFoundException(ResString.shakaPackagerNotFound);
                     option.DecryptionBinaryPath = file ?? file2 ?? file3 ?? file4;
                     Logger.Extra($"shaka-packager => {option.DecryptionBinaryPath}");
                 }
                 else if (option.DecryptionEngine is DecryptEngine.MP4DECRYPT)
                 {
                     var file = GlobalUtil.FindExecutable("mp4decrypt");
-                    if (file == null) throw new FileNotFoundException("mp4decrypt not found!");
+                    if (file == null) throw new FileNotFoundException(ResString.mp4decryptNotFound);
                     option.DecryptionBinaryPath = file;
                     Logger.Extra($"mp4decrypt => {option.DecryptionBinaryPath}");
                 }