**** *** *** *** findings **** **** ****:
- ***** ******* *** ******* between *** ********, **** day *** *****, *** all *** ****** ******.
- **** ***-***** ***** *********** features (****/********** ********) ******** improved *** ***** ***********.
- *** ******** ******** ** FPS ** ** ********** on *** ******* ******* frame ****.
- ******** ******* ****** *** Genetec ******** ****** ******** four *** ******** *** all ********, ***** ***** and ********* ******** **** one *** **** *** Hikvision. **** ******** * for **** ******* *** all *****.
- *** ******** ********** ******** ** *** encoders, *********** * *****-* PTZ ******* ***** *** the *** ********* *** when ********** **** *****.
- ********* ***********: **** ***** ********* *********** was ****** *******, ** average ** ~**% ***** than *** ********* **-*******. The **** ***-*****, ****** CBR ****, ******** ****** bitrates (*** **/*) ** maintain ******* *********** ** **** and ********* ********.
- *** *** ****** ******** notably **** ********* **** 600 *** *** *** encoders.
*****
***** *** **** ******* tested ** ****** *****:
**** **** **** *** Sony ***** ***** **** options **** ******* ******* sets. **** ****** *** lower **** ***** ******* (~$*** ***** ****** ***** cuts), ***** ******* ***** and */* ******* *** reduces **** ********** ********* to * *** ** 15. **** **** ****** the ***-***** (~$***), ***** removes *****, */*, *** PTZ *******.
***************
*******, ******* ******* *********** was ******* ** ***** of ***** *******, *** control, *** *** ***********, selection *********** ***** **** to *****. ***** ****** be ******* ** ******** not **** ******* *****, but *** *********, ** well, ** ******** ******** required *** **** ** much ** ** **** than *** ******* ******.
Future ** ********
****** ******** **** ****** less ********** *** ** two *** *******:
- ******* ** ****** ******: ******* ** ****** price *** ******* ** 25% ** *** **** few *****, ****** ********* IP ******* **** ********** than *********** ***** ****** installations.
- ****** **: *** ************ ** HD **** **** ******* such *********************** *** ******* ** ******* exist **** ************** ** encoders **, ***** ********** resolution, **** *** ****** ********* lower **** ****** ********.
**** ** ***** ******* provide ******* ********** **** even ********** *** ****** *******, ****** **** **** attractive.
Physical ********
** *** ***** ***** we **** ** *** physical ******** ** *** Axis, *********, *** **** encoders. *** **** ******* physical ********, ********* */*, audio, *** ****** *******, but **** ** **** substantially.
VMS *********
*** ****** ** ******** required *** **** ******* varied ** ***. ********* and ***** ******* **** a ****** ******* *** the **** *** ********* encoders, ***** **** **** a ****** ** *******. Genetec *** ******** ******* a ******* *** *******. Note **** ******** ******** only * ****** ******* for ***** *** ********.
*** **** ******** ******* an ** ******* ** each *******, *** ** a ****** ******* ** four ******** *******, ********* a *** ******* *** channel ********** ** ***.

Image ******* ******
** ****** ***** ******* of **** ******* ***** a *** *** ******, in *** *** ***** below:

** **** ***** (~*** lux), **** ******* ** similar ****** *** ********, with ***** ******* ******* visible *** ***** *-* of *** ***** *******.

** *** ***** (~*.* lux) **** ** ************ on, ******* *** ***** similar.

**** *** ***** ************
*** **** ******** ****** two *********** ** *** light *******: **** ** noise *********, *** ********** enhancer, * ******** ***********. The ********** ** *** light *********** ** **** seen ** *** ******* below, **** *** ******* in *** *** **** of *** ***, ***** IR ************ ** *** as ******.

*******, ***** ******** ** not ******* **** *********** in ******* ** ****** the ******* ** **** chart, **** *****.

PTZ ***********
*** ******** ****** ******* issue ** *** ******** using *****-* ********. ****** setup ******** ******** ******* models, *********** ** ******** users **** ** ****** protocol, **** ****, *** camera **. ***** **** encoders ******* **** * single ****** ****, ****** ID ** **** ** discretely ******* ******** *** cameras **** ********* ** one *******.
*** ****** ******** ******** PTZ ****** ********* (**-***/**-***). Axis ****** ************ ******* for ******** *************, ***** Hikvision *** **** ********* are *****. ** ***** encoders, **** *** **** SNTEX104 ****** ********* ********** (up *** **** ******* not ********* ******** ****** cabling). *** **** ***** does *** ******* **** option, *** ***** * series ****.
**** ***** ******* *** PTZ ***** ******* ***** an **** ***** *******:
*********
********* ****** ****** ******* encoders. *** **** ***** was ********* ****** *******, an ******* ** **% lower **** *** ********* DS-6704. *** ********* **-**** was *** ** **** scenes, *** ****** ** 740 **/* ** **** light **** **** **** the *** *** ****** camera *** ** ********** patterns (******/*****/*******) *** **** with *** *** *** camera.
*** **** ***-***** ****** *** streamining ****. ** *** Kb/s, ************ *** ******* to ***** *******, ~**-** in *** *** *** camera. ************ ***** *** 900 *** ***** *** 29-30, ******** ****** **** others.

***********
******** **** *** **** encoder ******:
- **** *****: *.**.*.*
- ********* **-****: *.*.********
- **** ***-*****: *.**.***
*** ******** ********:
- ******** ******* ****** *.*.*.**
- *********** *.*.*.*****
- ******* *.* ***
- ********* ******** **********: **** 9.0b/Device **** *.*
Comments (9)
Luke Maslen
Hi Derek, thank you for your article. Why do you think the night time bandwidth was lower than day time? I'm used to seeing the opposite results.
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Derek Ward
Thank you Luke.
As you know, bandwidth consumption on the cameras/encoders are already low (less than 1 Mb/s). In the daytime, the camera needs to discern details we don't see in our low light scene (such as the carpet). However, in low light, with IR Illumination On, we don't see the carpet as being "complex" anymore. Also, we do not need/see a large amount of low light gain with IR on, and with lower gain, there is less noise, and with less noise, bandwidth is reduced.
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Luke Maslen
Hi Derek, thank you for confirming those points. I wasn't sure if the IR lighting would enable the camera to pick up details in the carpet or not so hence my question. I greatly appreciate you spelling out the factors that explain bandwidth at day vs night.
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Undisclosed #1
Hi Derek, thanks!
Since the output aspect ratios differ between the encoders, does that mean that one picture is slightly stretched compared to the others, or are some of the pixels black, i.e. "Letterboxed"?
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David Bock
I have 2 Vivotek 8 port units and Milestone makes me license each channel. If I were to move to an Axis P7216, would that just use 1 camera license and free up the rest?
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Undisclosed #2
Axis Q series encoders supports Pelco Coaxitron. Not sure if other encoders do.
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