Add output format selection to settings

Introduces new settings for forcing output format when merging videos, allowing users to select a preferred format (mp4, webm, mkv). Updates all language files with relevant translations, adds UI controls in the settings dialog, persists settings via ConfigManager, and passes options through the download workflow to yt-dlp.

src/gui/ytsage_gui_dialogs/ytsage_dialogs_settings.py

@@ -36,6 +36,7 @@ from src.core.ytsage_utils import (
 from src.gui.ytsage_gui_dialogs.ytsage_dialogs_update import YTDLPUpdateDialog
 from src.utils.ytsage_logger import logger
 from src.utils.ytsage_localization import _
+from src.utils.ytsage_config_manager import ConfigManager
 
 
 class DownloadSettingsDialog(QDialog):
@@ -199,6 +200,47 @@ class DownloadSettingsDialog(QDialog):
         speed_group_box.setLayout(speed_layout)
         layout.addWidget(speed_group_box)
 
+        # --- Output Format Settings Section ---
+        output_format_group_box = QGroupBox(_("settings.output_format_settings"))
+        output_format_layout = QVBoxLayout()
+
+        # Load current format settings from ConfigManager
+        self.force_format_enabled = ConfigManager.get("force_output_format") or False
+        self.preferred_format_value = ConfigManager.get("preferred_output_format") or "mp4"
+
+        # Enable/Disable force output format checkbox
+        self.force_format_checkbox = QCheckBox(_("settings.force_output_format"))
+        self.force_format_checkbox.setChecked(self.force_format_enabled)
+        output_format_layout.addWidget(self.force_format_checkbox)
+
+        # Format selection layout
+        format_select_layout = QHBoxLayout()
+        format_label = QLabel(_("settings.preferred_format"))
+        format_label.setStyleSheet("color: #ffffff; margin-top: 5px;")
+        format_select_layout.addWidget(format_label)
+
+        self.format_combo = QComboBox()
+        self.format_combo.addItems([
+            _("settings.format_mp4"),
+            _("settings.format_webm"),
+            _("settings.format_mkv")
+        ])
+        # Set current selection based on saved format
+        format_index_map = {"mp4": 0, "webm": 1, "mkv": 2}
+        self.format_combo.setCurrentIndex(format_index_map.get(self.preferred_format_value, 0))
+        format_select_layout.addWidget(self.format_combo)
+        format_select_layout.addStretch()
+        output_format_layout.addLayout(format_select_layout)
+
+        # Help text
+        help_label = QLabel(_("settings.force_format_help"))
+        help_label.setWordWrap(True)
+        help_label.setStyleSheet("color: #cccccc; margin: 5px; font-size: 10px;")
+        output_format_layout.addWidget(help_label)
+
+        output_format_group_box.setLayout(output_format_layout)
+        layout.addWidget(output_format_group_box)
+
         # --- Auto-Update yt-dlp Section ---
         auto_update_group_box = QGroupBox(_("settings.auto_update_ytdlp"))
         auto_update_layout = QVBoxLayout()
@@ -278,6 +320,15 @@ class DownloadSettingsDialog(QDialog):
         """Returns the index of the selected speed limit unit."""
         return self.speed_limit_unit.currentIndex()
 
+    def get_force_format_enabled(self) -> bool:
+        """Returns whether force output format is enabled."""
+        return self.force_format_checkbox.isChecked()
+
+    def get_preferred_format(self) -> str:
+        """Returns the selected preferred format (lowercase)."""
+        format_map = {0: "mp4", 1: "webm", 2: "mkv"}
+        return format_map.get(self.format_combo.currentIndex(), "mp4")
+
     def _create_styled_message_box(self, icon, title, text) -> QMessageBox:
         """Create a styled QMessageBox that matches the app theme."""
         msg_box = QMessageBox(self)
@@ -334,11 +385,17 @@ class DownloadSettingsDialog(QDialog):
         return enabled, frequency
 
     def accept(self) -> None:
-        """Override accept to save auto-update settings."""
+        """Override accept to save auto-update and format settings."""
         try:
             # Save auto-update settings
             enabled, frequency = self.get_auto_update_settings()
 
+            # Save output format settings
+            force_format = self.get_force_format_enabled()
+            preferred_format = self.get_preferred_format()
+            ConfigManager.set("force_output_format", force_format)
+            ConfigManager.set("preferred_output_format", preferred_format)
+
             if update_auto_update_settings(enabled, frequency):
                 QMessageBox.information(
                     self,