Question Audio drift on NVR Dahua NVR4108-4KS2

May 29, 2022
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Hello, i'm new here. I have a small surveillance system: a Dahua nvr (NVR4108-4KS2) paired via cable with a little Imou Bullet ip cam. Whenewer i wish to export videos to my pc, i choose to save in mp4 i notice that audio, in the recording, tends to drift progressively. The longest the time extracted, the longest the delay (after 10 min almost 1 second shifted). Videos exported in DAV format are fine, instead. I would like to ask if anyone can provide any clue about this issue. Please, feel free to ask if more information about my setup is needed :) .
 
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May 29, 2022
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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.
 
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May 29, 2022
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What about the lawyer's PC specs?

What sort of troubles did she have?
She uses a Hp (2017 maybe, looks like a cheap 250 g5) laptop, with hdd and perhaps only 4gb ram: i did not inquire very much about her problem, but i think it may be related to slow responsiveness while reading the files, due to low read speeds.
 
May 29, 2022
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he question becomes, as you have noted, whether or not her HP laptop is up to the task.

Any chance the laptop can be upgraded: more RAM perhaps?
Yup, i'm sure her laptop performance will skyrocket with ssd upgrade only (as i already suggested her). I checked a similar notebook for a friend, some years ago: it had some heavy bottleneck related to hdd high usage (100% almost all the time), solved with cheap San Disk ssd. I can only assume she did not upgraded it yet due to time-work related issues (not to mention sensitive information she has to backup first). Piece of cake for us, but not a task for a person with very basic informatic knowledge. Anyway, i really had not thought abut making VLC (wich works fine) Dav compatible. I think i'll give it a try!
EDIT: UPDATE
I tried VLC 3.017 Vetinari and omg, it works!! Time index bar selection by clik does not work, but video can be fast forwarded with no issue except it's a little choppy and some graphical artifacts tend to appear, only to vanish one or two seconds later :D.
 
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May 29, 2022
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Update 31/05/22
I contacted customer service via Amazon, specifically the seller. I performed a complete reset to stock settings as they suggested. It is, in fact, a step i missed, because i used to copy and restore my old backup nvr configuration after cleaning it (usually once every 3-4 months). The problem seems solved, so i think it may be something related to "wrong" encoding options. I will try to replicate the issue sooner or later, i'm too curious .
I was also informed by my lawyer that she purchased a new laptop (it's about time XD).
 
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