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:
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: Download VC77 mp4
If a file is "dead" or corrupted, users often need to employ video repair tools to reassemble the data streams. If this is a camera recording, use specialized