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did you get this file from (e.g., a specific app, website, or security camera)? What is the exact file name or extension? Are you getting a specific error when you try to open it? That MP4 file you downloaded might just be another malware
However, the search results indicate that MP4 files, especially those from unfamiliar sources or security cameras (NVRs), can be associated with technical issues or security risks:
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: