diff --git a/apps/teacher_app/lib/data/repositories/teacher_repository.dart b/apps/teacher_app/lib/data/repositories/teacher_repository.dart
index 0d9f536..14c97ff 100644
--- a/apps/teacher_app/lib/data/repositories/teacher_repository.dart
+++ b/apps/teacher_app/lib/data/repositories/teacher_repository.dart
@@ -425,8 +425,9 @@ class TeacherRepository {
       );
 
       final decoded = json.decode(response.body) as Map<String, dynamic>;
-      if (response.statusCode == 200 || response.statusCode == 201)
+      if (response.statusCode == 200 || response.statusCode == 201 || response.statusCode == 422) {
         return decoded;
+      }
       throw StateError(
           decoded['message']?.toString() ?? 'رفض الخادم رفع الحصة.');
     } on StateError {
diff --git a/apps/teacher_app/lib/logic/cubits/teacher_studio_cubit.dart b/apps/teacher_app/lib/logic/cubits/teacher_studio_cubit.dart
index 1c1aba6..9261c9e 100644
--- a/apps/teacher_app/lib/logic/cubits/teacher_studio_cubit.dart
+++ b/apps/teacher_app/lib/logic/cubits/teacher_studio_cubit.dart
@@ -314,6 +314,7 @@ class TeacherStudioCubit extends Cubit<TeacherStudioState> {
         fileBytes: state.selectedFileBytes,
       );
 
+      final status = res['status']?.toString();
       final data = res['data'] is Map
           ? Map<String, dynamic>.from(res['data'] as Map)
           : <String, dynamic>{};
@@ -325,6 +326,19 @@ class TeacherStudioCubit extends Cubit<TeacherStudioState> {
         'lesson_title': state.lessonTitle,
         'subject': selectedSubjectName
       });
+
+      if (status == 'needs_review' || report['decision'] == 'needs_manual_review' || report['decision'] == 'rejected') {
+        final reason = report['reason']?.toString() ?? res['message']?.toString() ?? 'لم يجتز الفيديو تدقيق الجودة.';
+        emit(state.copyWith(
+          isAuditing: false,
+          isUploading: false,
+          isUploaded: false,
+          auditResult: result,
+          errorMessage: reason,
+        ));
+        return false;
+      }
+
       final msg = res['message']?.toString() ?? 'تم اعتماد الحصة ورفعها بنجاح.';
       emit(state.copyWith(
         isAuditing: false,
diff --git a/backend/app/Services/AiVideoAnalyzerService.php b/backend/app/Services/AiVideoAnalyzerService.php
index 4e422d4..35ea195 100644
--- a/backend/app/Services/AiVideoAnalyzerService.php
+++ b/backend/app/Services/AiVideoAnalyzerService.php
@@ -82,9 +82,31 @@ class AiVideoAnalyzerService
 
         // Extract a representative frame; Gemini receives real media evidence,
         // not only the title or metadata supplied by the teacher.
-        $frame = tempnam(sys_get_temp_dir(), 'saqel_audit_') . '.jpg';
+        $tempBase = tempnam(sys_get_temp_dir(), 'saqel_audit_');
+        @unlink($tempBase);
+        $frame = $tempBase . '.jpg';
+
         $ffmpeg = trim((string)@shell_exec('command -v ffmpeg 2>/dev/null'));
-        if ($ffmpeg === '' || @shell_exec(escapeshellarg($ffmpeg) . ' -y -ss ' . escapeshellarg((string)max(1, (int)($duration / 3))) . ' -i ' . escapeshellarg($path) . ' -frames:v 1 -q:v 3 ' . escapeshellarg($frame) . ' 2>/dev/null') === null || !is_file($frame)) {
+        if ($ffmpeg === '') {
+            foreach (['/usr/bin/ffmpeg', '/usr/local/bin/ffmpeg', '/bin/ffmpeg'] as $cand) {
+                if (@is_executable($cand)) {
+                    $ffmpeg = $cand;
+                    break;
+                }
+            }
+        }
+        if ($ffmpeg === '') {
+            return ['decision' => 'needs_manual_review', 'reason' => 'خدمة فحص الوسائط (ffmpeg) غير متوفرة على الخادم', 'duration_seconds' => $duration];
+        }
+
+        $ssTime = max(1, (int)($duration / 3));
+        $cmd = escapeshellarg($ffmpeg) . ' -y -ss ' . escapeshellarg((string)$ssTime) . ' -i ' . escapeshellarg($path) . ' -frames:v 1 -q:v 3 ' . escapeshellarg($frame) . ' 2>&1';
+        $output = [];
+        $returnCode = 1;
+        @exec($cmd, $output, $returnCode);
+
+        if ($returnCode !== 0 || !is_file($frame) || filesize($frame) === 0) {
+            error_log("AiVideoAnalyzerService ffmpeg extraction failed (code {$returnCode}): " . implode("\n", array_slice($output, -5)));
             return ['decision' => 'needs_manual_review', 'reason' => 'تعذر استخراج لقطة للتقييم؛ لم يتم رفع الفيديو', 'duration_seconds' => $duration];
         }
         try {
@@ -98,7 +120,8 @@ class AiVideoAnalyzerService
                 ]],
                 'generationConfig' => ['responseMimeType' => 'application/json', 'temperature' => 0.1],
             ];
-            $ch = curl_init('https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-lite-latest:generateContent?key=' . rawurlencode($key));
+            $geminiModel = getenv('GEMINI_MODEL') ?: 'gemini-1.5-flash';
+            $ch = curl_init('https://generativelanguage.googleapis.com/v1beta/models/' . rawurlencode($geminiModel) . ':generateContent?key=' . rawurlencode($key));
             curl_setopt_array($ch, [CURLOPT_POST=>true,CURLOPT_POSTFIELDS=>json_encode($payload),CURLOPT_HTTPHEADER=>['Content-Type: application/json'],CURLOPT_RETURNTRANSFER=>true,CURLOPT_TIMEOUT=>30]);
             $body = curl_exec($ch); $code = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch);
             $text = json_decode((string)$body, true)['candidates'][0]['content']['parts'][0]['text'] ?? '';