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Review - Dahua IPC-HFW7442H-Z 4MP Ultra AI Varifocal Bullet Camera

Wildcat_1

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@rsoxhater I generally go with the more ends up being less approach with OpenALPR. Specifically that through processing the actual FPS OpenALPR will always be less than what you feed it.

Therefore I run:

  • Sub Stream = Sub Stream 2 is the RTSP that I generally pass (depending on the cam of course)
  • Res = full HD (1920 x 1080)
  • FPS = 30 (usually see this process at 10 - 15 through OpenALPR)
  • Iframe = 30 (set to match FPS)
  • Bit Rate = (high, usually between 8192 & 10240)
For reference, I run OpenALPR agents through Docker on a Mac.

Side note, I also have a potential 4th capture stream as well for OpenALPR as I use tripwires on 1 LPR cam to force a PTZ to a preset choke point that is dialed in that it can also get plate + model if needed. By the time the tripwire is tripped the PTZ is in position and waiting for the vehicle :)

HTH

Also, here is the link for the 2 free camera licenses:
 

rsoxhater

n3wb
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@rsoxhater I generally go with the more ends up being less approach with OpenALPR. Specifically that through processing the actual FPS OpenALPR will always be less than what you feed it.

Therefore I run:

  • Sub Stream = Sub Stream 2 is the RTSP that I generally pass (depending on the cam of course)
  • Res = full HD (1920 x 1080)
  • FPS = 30 (usually see this process at 10 - 15 through OpenALPR)
  • Iframe = 30 (set to match FPS)
  • Bit Rate = (high, usually between 8192 & 10240)
For reference, I run OpenALPR agents through Docker on a Mac.

Side note, I also have a potential 4th capture stream as well for OpenALPR as I use tripwires on 1 LPR cam to force a PTZ to a preset choke point that is dialed in that it can also get plate + model if needed. By the time the tripwire is tripped the PTZ is in position and waiting for the vehicle :)

HTH
Sounds good. I'm getting good recognition in the daytime at 5fps on mjpeg at 1920x1080. I'm a bit worried about the h.264 and it seeing an iframe only once a second, but it seems openalpr has made accommodations for that (at least I hope before I swap this camera out). Traffic is usually pretty heavy on this road, but on occasion when there is no traffic cars can pass by at over 40mph.
 

Davahad

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I have never used SD Cards in cameras and record 24/7 the NVR. What happens if you add SD Card to this cam and also use NVR for recording, etc? Is there any advantage to also having SD Card installed?
 

Wildcat_1

Getting comfortable
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@Davahad yes, it gives you a backup by writing to SD as well. I do that on all cams personally (unless specific installation requirements or dark sites etc). You can also then review the footage through the web GUI directly from the cam. You could also FTP (or now in the new cams thankfully SFTP) to a NAS unit if you wanted to backup caps that way. SD card though is an easy addition and again gives you a backup in case any issues with NVR etc

HTH

I have never used SD Cards in cameras and record 24/7 the NVR. What happens if you add SD Card to this cam and also use NVR for recording, etc? Is there any advantage to also having SD Card installed?
 

Wildcat_1

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@rsoxhater based on the attack angle and height of your install along with distance to target you shouldn't have any issues. I run mine in h.264 as well. Set for at least 1/2000 (or higher depending on lighting conditions etc) and you should be fine. Also if you want assistance with the triangulated approach that I mentioned I run can offer some tips there for 2 x ANPR/LPR duty + PTZ for overwatch and activated shot. Let me know if you need any more help.


Sounds good. I'm getting good recognition in the daytime at 5fps on mjpeg at 1920x1080. I'm a bit worried about the h.264 and it seeing an iframe only once a second, but it seems openalpr has made accommodations for that (at least I hope before I swap this camera out). Traffic is usually pretty heavy on this road, but on occasion when there is no traffic cars can pass by at over 40mph.
 
Last edited:

rsoxhater

n3wb
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@rsoxhater based on the attack angle and height of your install along with distance to target you shouldn't have any issues. I run mine in h.264 as well. Set for at least 1/2000 (or higher depending on lighting conditions etc) and you should be fine. Also if you want assistance with the triangulated approach that I mentioned I run can offer some tips there for 2 x ANPR/LPR duty + PTZ for overwatch and activated shot. Let me know if you need any more help.
Do you use the dahua utility that is floating around the forums here to switch to a different profile at night, or does the profile day/night selection work on this firmware?
 

Wildcat_1

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@rsoxhater I don't use the utility, I usually prefer to control within the cam web GUI (or you could use an NVR, not sure of your setup) and go with manual day & night profiles OR you could use the Day/Night auto option in cam which does work in this FW without issue. I've not seen any shift in focus issues with this cam as it changes between profiles.


Do you use the dahua utility that is floating around the forums here to switch to a different profile at night, or does the profile day/night selection work on this firmware?
 

Davahad

Young grasshopper
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@Davahad yes, it gives you a backup by writing to SD as well. I do that on all cams personally (unless specific installation requirements or dark sites etc). You can also then review the footage through the web GUI directly from the cam. You could also FTP (or now in the new cams thankfully SFTP) to a NAS unit if you wanted to backup caps that way. SD card though is an easy addition and again gives you a backup in case any issues with NVR etc

HTH
What size SD cards do you recommend? What is the max for this camera?
 
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