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smart IR issue explained
I decided to write this thread, as there is more and more rumor about Smart IR function on the forum, and it seems to me that most users have a false vision of how it should work and what’s its main porpoise. Unfortunately even such services as IPVM suggest in some of its reviews, that smartIR... -
I was right all along, Dahua IPC-HDW4831EM-ASE - Don't follow the 4K Hype
Purple fringing is an optical flaw of a lens. It has nothing to do with video specs. -
What causes these ghost images?
It's a noise reduction ghosting. Nothing else. If you turn it off, ghosting will disappear. Try to lower it by half. -
Review-OEM 4mp AI Cam IPC-T5442TM-AS Starlight+
Both files are identical. I watched them frame by frame. No duplicated frames. Both are 30fps. I even uploaded your DAV to my youtube. It works fine. -
Review-OEM 4mp AI Cam IPC-T5442TM-AS Starlight+
In case of IP camera I don't think there is any difference between PAL and NTSC other than available framerates. It it important in case of analog systems. As for frame rate, 25fps vs 30fps is not a big difference. You will not loose much. -
Review-OEM 4mp AI Cam IPC-T5442TM-AS Starlight+
In Europe we have PAL video standard which is 25fps. Everything above 24fps should appear to your eyes as smooth motion. So both PAL and NTSC apply to this rule :) -
Dahua IPC-T5442TM-AS-LED review
On microSD. No problems with choppy video. I use IE. -
Review-OEM 4mp AI Cam IPC-T5442TM-AS Starlight+
@zape Your DAV file has every 5th frame doubled. These are not dropped frames but added ones. That's why files do not match in duration. Try setting the camera to 25fps and compare again. -
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Dahua IPC-T5442TM-AS-LED review
Is there any way to change the title of the thread? -
Dahua IPC-T5442TM-AS-LED review
Hi everyone. Today I present you a review of full color starlight+ camera, Dahua IPC-T5442TM-AS-LED. I got this one from Andy in exchange for in-depth review. Thank you Andy :) This is a 4 megapixel, turret type camera with white light illumination. It is equipped with 1/1.8-inch type CMOS... -
Dahua in extreme weather conditions
This is how a Dahua setup behaves when straight line wind strikes: This is a gust front before the thunderstorm in Poland last month. I will mark, that each roof tile weighs 4-5kg -
Periodic Table of Image Sensors
Strange. The link is dead now. Luckily I've downloaded the file some time ago. See the attachment. -
How warm is Dahua cam?
Here are some thermal images, done with FLIR camera of my HDW4231EM-AS and HDW5831R-ZE cams. The air temperature was exactly 3.3 Celsius degrees (38 Fahrenheit). No wind or sun influence (it was overcast day). So if you are worried, that you camera can freeze in low temperatures… stay cool :D... -
Periodic Table of Image Sensors
It's a vector based graphic. You can scale the first page to whatever size you want. -
Periodic Table of Image Sensors
https://www.ptgrey.com/support/downloads/11165 Not all sensors are listed, but it gives a nice overview of sensor types and manufacturers. And it looks cool :D -
Dahua Starlight+
The only sensor that matches, is this one: Image Sensors World: Smartsens Unveils NIR-Enhanced 4MP Sensor It's so new, that it is not even listed on their official website. -
Pre-event recording to SD card
Ok. Maybe I wrote it incorrectly. The cards are not dead, but lot of errors occur. Some files are unreadable or choppy (lot of dropped frames). I use 64GB Sandisk Ultra A1 class micro SD. -
Pre-event recording to SD card
Hi all. I’ve been using Dahua cams for a 1.5 year now, and I’m pretty happy with this equipment. There is however one thing that is bothering me. I use my cams only with micro SD cards. It makes the system as simple as possible. Every cam is powered by separate 12V UPS, which makes every cam... -
Dahua HFW-1831E in-depth review
@vidmo I know, I messed up with sides :) But it was too late to correct it, when I realized that. 87 degrees is correct. It has identical FOV as 4231EM-AS with 3.6mm lens. @M1CHA3L Varifocal version has slightly darker lens at wide side - f1.9 (1831E has f1.6 lens) which means it won't be as... -
hopefully a quick "need advice" thread :)
@eleazar Before you go with 1831E just remember it has a problem with resetting date and time. This can cause problems when using day/night profiles. When the clock resets, it might suddenly change to day mode during night or vice versa. You can of course synch the clock with NTP, but I haven't... -
Dahua HFW-1831E in-depth review
Indeed, something is wrong in these specs. A 4mm lens gives identical FOV as my 4231EM-AS with 3.6mm lens. -
Dahua HFW-1831E in-depth review
I present you a review of HFW-1831E camera. This is a h265 Lite series model, most likely equipped with fairly new IMX334 Sony sensor. This is a 1/1.8 inch, 8 megapixel CMOS with a pixel size of 2 micrometers. I got a model with 4mm lens, giving a horizontal FOV of around 87 degrees. I will... -
What is causing this pulsating video (DH-SD59225U-HNI)
Sorry, but this is not true. VBR is meant to keep your file smaller, while trying to keep motion parts of the image in better quality than static scenes. In case of Dahua this is only 1-pass VBR so coding is based on average quality setting, and not analysis of footage like in case of 2-pass... -
What is causing this pulsating video (DH-SD59225U-HNI)
Nothing to worry about. You just messed up codec settings. Your image is loaded with ton of detail (ruble on the road, grass, pouring rain) and you use ridiculously low bitrate. So the codec freaks out. First turn on smart codec. Secondly, always use constant bitrate and set I frames to 20... -
(8MP) IPC-HFW1831E Review
Is it possible do downgrade the firmware? I've updated from 2.622.0000000.4.R to 2.622.0000000.8.R and lost high bitrate settings. The reseting time stamp has been fixed but now even if i set a custom bitrate to maximum 15104kbps the real bitrate is around 9000kbps and the image really suffers... -
(8MP) IPC-HFW1831E Review
@Burton_Flooring Thanks a lot. It worked. I still have lot of glitches in recorded files, but at least it's mp4 and I have a working motion detection. I actually used smartPSS for a long time for downloading timelapse snaps from 4231, but I didn't know it can act as a PC-NVR. Now I can do some...