Fix: auto-resize character image before upload for Kling Motion

src/content_engine/api/routes_video.py

@@ -309,6 +309,18 @@ async def _generate_kling_motion_video(
     import aiohttp
 
     try:
+        # Resize image if too large (Kling Motion limit)
+        from PIL import Image
+        import io
+        img = Image.open(io.BytesIO(image_bytes))
+        max_size = 1280
+        if img.width > max_size or img.height > max_size:
+            img.thumbnail((max_size, max_size), Image.LANCZOS)
+            buf = io.BytesIO()
+            img.save(buf, format="JPEG", quality=90)
+            image_bytes = buf.getvalue()
+            logger.info("Resized character image to %dx%d", img.width, img.height)
+
         _video_jobs[job_id]["message"] = "Uploading character image..."
         image_url = await _wavespeed_provider._upload_temp_image(image_bytes)
         logger.info("Kling motion: character image uploaded: %s", image_url[:80])