If this is a camera recording, use specialized repair software or the proprietary software that came with your security system to fix the MP4 container. If you can provide more context, I can help you better:
A 2019 report warned that MP4 files downloaded from unknown sources can be used to deliver malware, specifically mentioning vulnerabilities patched in applications like WhatsApp. Download VC77 mp4
MP4 files, particularly those downloaded from Network Video Recorders (NVRs), may have metadata issues or be corrupted, making them unplayable in standard media players. If this is a camera recording, use specialized