[error} add downloader error

lib/services/download.dart

@@ -120,10 +120,34 @@ class DLServices {
         '${video.url.trim()} --sub-langs "all,-live_chat" --embed-subs --embed-thumbnail --embed-metadata --progress -o "temp/${video.filename}_$strType.%(ext)s" -f "$formatCmd"';
 
     var shellLinesController = ShellLinesController();
-    var shell = Shell(stdout: shellLinesController.sink, verbose: false);
+    var shellErrorController = ShellLinesController();
+
+    var shell = Shell(
+        stdout: shellLinesController.sink,
+        stderr: shellErrorController.sink,
+        verbose: false);
 
     debugPrint('Running $ytDlpPath $command');
-    shell.run('$ytDlpPath $command');
+    await shell.run('$ytDlpPath $command').then((result) {
+      result.map((e) {
+        debugPrint('Analyse result: $e');
+        FileLogger().d('Analyse result: ${e.toString()}');
+        FileLogger().d('stdout: ${e.stdout}');
+        FileLogger().d('stderr: ${e.stderr}');
+      });
+    }).catchError((
+      error,
+      stackTrace,
+    ) {
+      if (error is ShellException) {
+        debugPrint('ShellException: ${error.message}');
+        FileLogger().e('ShellException error: ${error.result?.stderr}');
+        FileLogger().e('ShellException out: ${error.result?.stdout}');
+      } else {
+        debugPrint('Error: $error');
+        FileLogger().e('Error: $error');
+      }
+    });
 
     return shellLinesController.stream;
   }