The .14m denotes the expected length of that packet: (or sometimes 14 minutes of metadata).
If your edge device (camera, local recorder) writes to flash storage, that storage wears out. When an SD card begins to fail, it doesn’t just delete files; it truncates them. The device thinks it wrote 14MB. The OS reads a corrupted table and sees only 7MB. The mismatch triggers the error. avp.14m incorrect length
Check the release notes for your NVR or logging software. Search for "Resolved incorrect packet length validation." If you see that, you have discovered a bug that 1,000 other sysadmins have already lost sleep over. The Hard Truth When you see "avp.14m incorrect length," the error message is lying to you. The length isn't the problem. The problem is trust . The device thinks it wrote 14MB
Run grep -rn "avp.14m" /var/logs/ to find the exact device IP or file handle throwing the error. Is it always Camera #4? Or is it the central archive? Check the release notes for your NVR or logging software