From fa287261d0b42541129057a1b93680fae2b550cb Mon Sep 17 00:00:00 2001
From: Mike Johnston <mike@nervesocket.com>
Date: Mon, 9 Feb 2026 22:20:16 -0500
Subject: [PATCH] prevent cache

---
 app.py               | 7 ++++++-
 templates/index.html | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/app.py b/app.py
index 6cb66e6..ac19ee7 100644
--- a/app.py
+++ b/app.py
@@ -221,7 +221,12 @@ def preview_video(file_id):
         if not os.path.exists(output_path):
             return jsonify({'error': 'File not found'}), 404
         
-        return send_file(output_path, mimetype='video/mp4')
+        response = send_file(output_path, mimetype='video/mp4')
+        # Prevent caching
+        response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0'
+        response.headers['Pragma'] = 'no-cache'
+        response.headers['Expires'] = '0'
+        return response
     except Exception as e:
         return jsonify({'error': str(e)}), 500
 
diff --git a/templates/index.html b/templates/index.html
index 4dbfbb5..f7a286e 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -1253,9 +1253,9 @@
                     throw new Error(data.error || 'Processing failed');
                 }
 
-                // Load processed video preview
+                // Load processed video preview with cache-busting
                 const processedVideoPreview = document.getElementById('processed-video-preview');
-                processedVideoPreview.src = `/preview/${currentFileId}`;
+                processedVideoPreview.src = `/preview/${currentFileId}?t=${Date.now()}`;
                 
                 // Show download section
                 document.getElementById('edit-section').classList.add('hidden');