[error] clean errors

lib/services/download.dart

@@ -39,6 +39,7 @@ class DLServices {
     if (Platform.isWindows) {
       assetName = 'yt-dlp.exe';
     } else if (Platform.isLinux) {
+      checkFFmpeg();
       assetName = 'yt-dlp_linux';
     } else if (Platform.isMacOS) {
       assetName = 'yt-dlp_macos';
@@ -65,6 +66,35 @@ class DLServices {
     }
   }
 
+  Future<void> checkFFmpeg() async {
+    try {
+      var result = await Process.run('ffmpeg', ['-version']);
+      if (result.exitCode == 0) {
+        print('FFmpeg is already installed.');
+        return;
+      }
+
+      result = await Process.run('sudo', ['-n', 'true']);
+      bool hasSudo = result.exitCode == 0;
+
+      if (hasSudo) {
+        print('Installing FFmpeg...');
+        result =
+            await Process.run('sudo', ['apt-get', 'install', 'ffmpeg', '-y']);
+        if (result.exitCode == 0) {
+          print('FFmpeg installed successfully.');
+        } else {
+          print('Error installing FFmpeg: ${result.stderr}');
+        }
+      } else {
+        print('Cannot install FFmpeg without sudo privileges.');
+        // Here, you might want to inform the user they need to manually install FFmpeg
+      }
+    } catch (e) {
+      print('An error occurred: $e');
+    }
+  }
+
   Future<Stream> downloadFile(Video video) async {
     debugPrint(
         'Downloading $url in ${video.format.format} format (${video.filename})');
@@ -131,23 +161,12 @@ class DLServices {
     ) {
       if (error is ShellException) {
         debugPrint('ShellException: ${error.message}');
-        FileLogger().e('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');
       }
-      if (stackTrace != null) {
-        debugPrint('Stacktrace: $stackTrace');
-        FileLogger().e('Stacktrace: $stackTrace');
-      }
-      if (error.map) {
-        error.map((e) {
-          debugPrint('Analyse result: $e');
-          FileLogger().d('Analyse result: ${e.toString()}');
-          FileLogger().d('stdout: ${e.stdout}');
-          FileLogger().d('stderr: ${e.stderr}');
-        });
-      }
     });
 
     return shellLinesController.stream;