Hi, thanks for the answer. Actually i am not using software of any kind: i forgot to mention that i am using Nvr's built-in feature to export files.
I tried 2 methods:
1- Backup on usb pendrive using the nvr OS;
2- Export directly on my pc, using web interface (browser Edge).
Sadly, i encountered the same indentical issue on both cases. Some months ago i tried also exporting in Dav and then converting in mp4, i think with WinX: same results.
Also, just for the record, if DAV is working what is the reason for using .mp4?
I agree, but my lawyer, wich recently required several hours of recording had some trouble managing Smart Play (Dahua's native app for *.DAV files which, by the way, works like charm XD) and she asked me if i can make the files VLC readable.
Usually i enjoy troubleshooting via google but at this moment i still have not found any similar issue recorded :| .
By the way, my PC specs:
Asus Rog Strix B555-f Motherboard
AMD Ryzen 7 3800 XT CPU
32gb (2x16)Corsair Vengeance ddr4 3600 RAM
EVGA 3070 XC3 Black GPU
Samsung 970 plus 1TB SSD NVME (plus secondary normal ssd and 2 1tb Hdd)
Corsair CS650M PSU
OS: Windows 10.
I will soon provide some info about encoding i'm utilizing on my nvr.
Edit:
View: https://imgur.com/a/IICDrh2
<<-- Encoding info, Audio is set to AAC 16k.