Maine EduSphere AI ke liye ek complete full-stack video generation app build kar diya hai. App mein ye features hain:

API Routes:

• /api/upload - Images ko Vercel Blob mein upload karta hai
• /api/generate-video - fal.ai se AI video generate karta hai (demo mode bhi available hai jab tak FAL_KEY nahi hai)
• /api/videos - Generated videos ki list deta hai
• /api/file - Stored files serve karta hai

Studio Page (/studio):

• Drag-and-drop image uploader with preview
• Subject selection (Programming, Database, Web Dev, etc.) aur topic input
• Popular quick topics for fast selection
• Real-time generation progress with animated steps
• Video player with controls (play/pause, volume, fullscreen, download, share)
• Video history that persists in localStorage (last 20 videos)

Navigation Updates:

• Navbar mein "AI Studio" link add kiya
• Hero section ka CTA ab directly Studio page pe le jaata hai

Demo Mode: Jab tak aap FAL_KEY environment variable add nahi karte, app demo mode mein kaam karega with a sample video. Real AI video generation ke liye, Settings > Integrations se fal.ai add karein.

Now let me check the generate-video API to see what demo video URL is being returned:

The issue is clear now. The demo video URL https://storage.googleapis.com/gtv-videos-bucket/sample/ForBiggerBlazes.mp4 might not be accessible or has CORS issues. Also, the video player needs better error handling. Let me fix this:

I fixed the video player issue by:

1. Changed the demo video URL to a more reliable public domain video (Big Buck Bunny)
2. Added proper error handling with onError, onLoadedData, and onCanPlay event handlers
3. Added a loading state with a spinner while the video loads
4. Added an error overlay with retry and "New Video" options when video fails to load
5. Added crossOrigin="anonymous" to handle CORS properly
6. Made togglePlay async with try-catch to handle play() promise rejections gracefully

The logs show no crashes or errors - just a minor warning about metadataBase for Open Graph images, which doesn't affect functionality. The app is running correctly with all routes returning 200 status.

The video player fixes are now in place. You can test the Studio page by:

1. Going to /studio or clicking "AI Studio" in the navbar
2. Uploading an image
3. Selecting a topic and subject
4. The demo video should now load properly with the loading state and error handling

To enable real AI video generation, add the FAL_KEY environment variable in Settings (top right) > Vars section.