diff --git a/src/main.js b/src/main.js
index 072570d..ef2a576 100644
--- a/src/main.js
+++ b/src/main.js
@@ -58,8 +58,8 @@ async function handleGenerate() {
     return;
   }
 
-  const model = el.selModel?.value || 'google/gemini-3.1-flash-image-preview';
-  const frameCount = Math.max(2, Math.min(24, Number.parseInt(el.inpFrames?.value || '4', 10) || 4));
+  const model = el.selModel?.value || 'bytedance-seed/seedream-4.5';
+  const frameCount = Math.max(2, Math.min(24, Number.parseInt(el.inpFrames?.value || '2', 10) || 2));
   const fps = Math.max(1, Math.min(30, Number.parseInt(el.inpFps?.value || '4', 10) || 4));
   const maxSize = Math.max(32, Math.min(1024, Number.parseInt(el.inpMaxSize?.value || '256', 10) || 256));
   const imageSize = '1K';
@@ -90,7 +90,7 @@ async function handleGenerate() {
 
     allFrames.push(first.base64);
     history.push(firstMsg, first.assistantMsg);
-    addFramePreview(el, first.base64, 0);
+    addFramePreview(el, first.base64, 0, aspectRatio);
     setProgress(el, Math.round((1 / frameCount) * generationMaxPct), `frame 1 of ${frameCount} done`);
 
     for (let i = 2; i <= frameCount; i++) {
@@ -110,7 +110,7 @@ async function handleGenerate() {
 
       allFrames.push(next.base64);
       history.push(nextUserMsg, next.assistantMsg);
-      addFramePreview(el, next.base64, i - 1);
+      addFramePreview(el, next.base64, i - 1, aspectRatio);
       setProgress(el, Math.round((i / frameCount) * generationMaxPct), `frame ${i} of ${frameCount} done`);
     }