WhatsApp and Telegram frequently rename media to simple numeric strings to save metadata space.
If you are looking for a that was titled this way, let me know: Where did you find or download it? What was the content of the video? How long is the video? 3399 (Bad output framerate decision for mp4 from camera) 449 (1)mp4
Use built-in tools like "Cleanup Recommendations" on Windows to find and delete these "(1)" duplicates automatically. WhatsApp and Telegram frequently rename media to simple
The suffix added by Windows or macOS because a file named "449.mp4" already exists in that same folder. 449 (1)mp4
When you see a name like this, it is usually the result of your operating system's feature.