previews and back to edit button

app.py

@@ -211,6 +211,20 @@ def download_video(file_id):
     except Exception as e:
         return jsonify({'error': str(e)}), 500
 
+@app.route('/preview/<file_id>')
+def preview_video(file_id):
+    """Serve processed video for inline preview"""
+    try:
+        output_filename = f"{file_id}_processed.mp4"
+        output_path = os.path.join(app.config['OUTPUT_FOLDER'], output_filename)
+        
+        if not os.path.exists(output_path):
+            return jsonify({'error': 'File not found'}), 404
+        
+        return send_file(output_path, mimetype='video/mp4')
+    except Exception as e:
+        return jsonify({'error': str(e)}), 500
+
 @app.route('/cleanup/<file_id>', methods=['DELETE'])
 def cleanup_files(file_id):
     """Clean up uploaded and processed files"""