feat: Implement transcription progress reporting and display preprocessing status in the UI.

lib/blocs/transcription/transcription_bloc.dart

@@ -73,6 +73,16 @@ class TranscriptionBloc extends Bloc<TranscriptionEvent, TranscriptionState> {
       final result = await _whisperService.transcribe(
         videoPath, // Pass video file directly
         language: event.language ?? 'auto',
+        onProgress: (progress) {
+          if (!emit.isDone) {
+            emit(Transcribing(
+              videoPath: videoPath,
+              fileName: fileName,
+              statusMessage: 'Transcribing...',
+              progress: progress,
+            ));
+          }
+        },
       );
 
       emit(TranscriptionComplete(

lib/blocs/transcription/transcription_state.dart

@@ -19,10 +19,7 @@ class VideoSelected extends TranscriptionState {
   final String videoPath;
   final String fileName;
 
-  const VideoSelected({
-    required this.videoPath,
-    required this.fileName,
-  });
+  const VideoSelected({required this.videoPath, required this.fileName});
 
   @override
   List<Object?> get props => [videoPath, fileName];
@@ -51,10 +48,7 @@ class AudioExtracting extends TranscriptionState {
   final String videoPath;
   final String fileName;
 
-  const AudioExtracting({
-    required this.videoPath,
-    required this.fileName,
-  });
+  const AudioExtracting({required this.videoPath, required this.fileName});
 
   @override
   List<Object?> get props => [videoPath, fileName];
@@ -65,15 +59,16 @@ class Transcribing extends TranscriptionState {
   final String videoPath;
   final String fileName;
   final String statusMessage;
-
+  final int progress;
   const Transcribing({
     required this.videoPath,
     required this.fileName,
     this.statusMessage = 'Transcribing...',
+    this.progress = 0,
   });
 
   @override
-  List<Object?> get props => [videoPath, fileName, statusMessage];
+  List<Object?> get props => [videoPath, fileName, statusMessage, progress];
 }
 
 /// Transcription completed successfully.

lib/l10n/app_en.arb

@@ -33,7 +33,8 @@
     }
   },
   "extractingAudio": "Extracting audio from video...",
-  "processingTranscription": "Whisper is processing...",
+  "processingTranscription": "Transcription in progress...",
+  "preprocessingStatus": "Preprocessing: Transcoding and silence detection...",
   "segmentsExtracted": "{count} segments extracted ({lang})",
   "@segmentsExtracted": {
     "placeholders": {

lib/l10n/app_localizations.dart

@@ -257,9 +257,15 @@ abstract class AppLocalizations {
   /// No description provided for @processingTranscription.
   ///
   /// In en, this message translates to:
-  /// **'Whisper is processing...'**
+  /// **'Transcription in progress...'**
   String get processingTranscription;
 
+  /// No description provided for @preprocessingStatus.
+  ///
+  /// In en, this message translates to:
+  /// **'Preprocessing: Transcoding and silence detection...'**
+  String get preprocessingStatus;
+
   /// No description provided for @segmentsExtracted.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_en.dart

@@ -89,7 +89,11 @@ class AppLocalizationsEn extends AppLocalizations {
   String get extractingAudio => 'Extracting audio from video...';
 
   @override
-  String get processingTranscription => 'Whisper is processing...';
+  String get processingTranscription => 'Transcription in progress...';
+
+  @override
+  String get preprocessingStatus =>
+      'Preprocessing: Transcoding and silence detection...';
 
   @override
   String segmentsExtracted(int count, String lang) {

lib/l10n/app_localizations_zh.dart

@@ -89,7 +89,10 @@ class AppLocalizationsZh extends AppLocalizations {
   String get extractingAudio => '正在从视频中提取音频...';
 
   @override
-  String get processingTranscription => 'Whisper 正在处理中...';
+  String get processingTranscription => '字幕转录中...';
+
+  @override
+  String get preprocessingStatus => '预处理：转码和静音检测中...';
 
   @override
   String segmentsExtracted(int count, String lang) {

lib/l10n/app_zh.arb

@@ -26,7 +26,8 @@
   "extract": "提取",
   "downloadingModel": "正在下载模型 {name}...",
   "extractingAudio": "正在从视频中提取音频...",
-  "processingTranscription": "Whisper 正在处理中...",
+  "processingTranscription": "字幕转录中...",
+  "preprocessingStatus": "预处理：转码和静音检测中...",
   "segmentsExtracted": "已提取 {count} 条字幕段 ({lang})",
   "stepTranslate": "翻译",
   "geminiApiKey": "API Key",

lib/services/whisper/whisper_service.dart

@@ -49,6 +49,7 @@ class WhisperService {
   Future<TranscriptionResult> transcribe(
     String mediaPath, {
     String language = 'auto',
+    void Function(int progress)? onProgress,
   }) async {
     if (_currentModel == null) {
       throw StateError('No model loaded. Call loadModel() first.');
@@ -60,6 +61,7 @@ class WhisperService {
       lang: language,
       withTimestamps: true,
       convert: true, // Auto-convert via registered FFmpeg converter
+      onProgress: onProgress,
     );
 
     if (result == null) {

lib/ui/widgets/transcription_panel.dart

@@ -139,11 +139,15 @@ class TranscriptionPanel extends StatelessWidget {
     }
 
     if (state is Transcribing) {
+      final s = state as Transcribing;
+      String label = s.progress > 0
+          ? l10n.processingTranscription
+          : l10n.preprocessingStatus;
       return _buildProgressRow(
         context,
         icon: Icons.mic_rounded,
-        label: l10n.processingTranscription,
-        progress: null,
+        label: label,
+        progress: s.progress > 0 ? s.progress / 100.0 : null,
         color: Colors.purple,
       );
     }
@@ -240,10 +244,7 @@ class TranscriptionPanel extends StatelessWidget {
             width: 80,
             child: Text(
               info.name,
-              style: const TextStyle(
-                fontWeight: FontWeight.bold,
-                fontSize: 13,
-              ),
+              style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 13),
             ),
           ),
           _buildModelSpecColumn(l10n.diskUsage, info.diskUsage),
@@ -267,10 +268,7 @@ class TranscriptionPanel extends StatelessWidget {
               color: Colors.white.withValues(alpha: 0.5),
             ),
           ),
-          Text(
-            value,
-            style: const TextStyle(fontSize: 12),
-          ),
+          Text(value, style: const TextStyle(fontSize: 12)),
         ],
       ),
     );

pubspec.lock

@@ -880,7 +880,7 @@ packages:
     description:
       path: "."
       ref: HEAD
-      resolved-ref: b57159c40d3356e51b32279c6cab12a9cb65cde3
+      resolved-ref: "649e41882878f2d04d3b087d907161fdb7a2681b"
       url: "https://github.com/cddqssc/whisper_ggml_plus.git"
     source: git
     version: "1.4.1"