Restore automatic output size that matches the input still.

Keep 16:9, 9:16, and square as overrides, but default aspect back to Auto so MiniMax follows the source image.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/generate.post.ts

@@ -111,7 +111,7 @@ export default defineEventHandler(async (event) => {
     folderLocked,
     name: clipName,
     prompt,
-    aspect: fields.aspect || '16:9',
+    aspect: fields.aspect || 'auto',
     width,
     height,
     steps,
@@ -177,7 +177,7 @@ export default defineEventHandler(async (event) => {
     seed,
     width,
     height,
-    aspect: fields.aspect || '16:9',
+    aspect: fields.aspect || 'auto',
     cfg,
     fps,
     sampler_name: samplerName,

server/utils/resolution.ts

@@ -85,10 +85,14 @@ function jpegSize(buf: Buffer) {
   return null
 }
 
-export function resolveOutputSize(aspect: string | undefined, _image: Buffer, fallbackWidth?: number, fallbackHeight?: number) {
+export function resolveOutputSize(aspect: string | undefined, image: Buffer, fallbackWidth?: number, fallbackHeight?: number) {
   if (aspect && ASPECT_PRESETS[aspect]) {
     return ASPECT_PRESETS[aspect]
   }
+  const size = imageDimensions(image)
+  if (size?.width && size?.height) {
+    return autoResolution(size.width, size.height)
+  }
   if (Number(fallbackWidth) && Number(fallbackHeight)) {
     return { width: snap32(Number(fallbackWidth)), height: snap32(Number(fallbackHeight)) }
   }