Tested: Lowering Bandwidth at Night is Good

Author: Ethan Ace, Published on Dec 29, 2014

Bandwidth spikes in low light are commonplace, with increases of 300 to 500% over daytime normal.

IPVM recommends lowering bandwidth levels at night, relative to those spikes. For example, if your camera consumes 2Mb/s during the day, but 10Mb/s at night, you can easily cap it to 5Mb/s (or even less) without any quality loss. This can reduce overall storage costs by 50%.

In this report, we share our test findings of multiple cameras set to average compression levels and then to high compression level to answer the following questions:

  • What visible difference does high compression video have in low light?
  • Are human subject or text details more difficult to discern at higher compression levels?
  • How did this increase in compression impact bandwidth?

********* ****** ** *** ***** *** ***********,**** ********* ** *** ** ***% **** ******* ******.

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Key ******* 

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  • **** ** ********* **** *** (***+) **** ******** *********** ** details ****, **** **** ********** ** ******* ******** *** ********* ********** of **** ****.

Why **** *******

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Recommendation: *** ***

***** **** ******** ********** *** ************** ** *** ** **** practice *** ***** *************, ********** ********* ** *** *** ** *** ** *** ******. ******* ********** ******** ** **** ********* ****** ***** *********** similar ***** ******* ******* *** **** ******* ** ***********. *** light ***** ******* ****** **** ** ********* ******* ***** *** artifacting ****** ***** ******* *** **** **** *** ******** ** quantization **** **** ******* **** ***** *** ***.

Compression ****** ** *******

*** ********** ** *** *********** ** *** *** ********, *** *** ** ****** ************ *********** ********** *** *** ** ******* ***** ******* / *********** ****** *******.

Image ***********

*** *********** ***** ***** **** ****** ** ******* *********** ****** (Q **) *** ** **** **** (* **) **** ****** bandwidth *********** ** **-**%.

****** ******* *** ***** ********** *** ******* ** **** ************ levels, **** ** ***** ***********. **** ** *** ****** (*, below) *** ****** ******* ********** ***** ** *** ******** ** Q28 *** **** ** ******* ** ** ********* **** ****** scene / ***.

Bandwidth **********

********** ************ **** ** ** ** ******** ** *********** ******* reductions, **% ** *******, **** ** *** ***** *****. ****** compression reduces ******* ********* **** ******* ***** ******* ** *** ***** images, ** ***** "***********" ****** ****** *** **** *******, ********* less *********.

Greater ****** ** ******* *****

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*** *******, *** ***** ***** ***** *** ******* ** ********* quantization ** **** ***** (~*** ***). ****** ******* ****** **** difficult ** *******, **** ************* ****** *** *******'* **** **** pixelated *** *******/*******. *** **** ***** ******* **** ********* ** make *** ** ***** */* *** ******, ** ****.

***********

******** ******* / ********* ** *********** ******** ** *******, ** ***** can ********** ****** ******* *****. *******, ***** ** **** ******'* bandwidth *********** ****** ** ***** (**** **, **** **** **). For ***** *******, ********* * *** '***' **** ** ******* than **** *** **** ******* *********** *** * ******** ** what *** ******** ****** ** ********* ** *****.

** ***** **, *** *** **** **% ** **** ********* at ***** ***** ****** ********** ****** ** ***** *******.

Comments (4)

******* ****** *****, * *** ******* ***** **** ** *** last * ****** **** ** **********, *** *** * *** of ******** ******.

******! ** **** ********** **** *** ****** ** ***** **** my ****-****** *********** ****** ***** **** **** *** *******.

** ***** ***** **** *********, ***** ** ** ******* ** set *** *********** ****** ******** **** *** *** ** ***********/***** ********, ** ******** ** *** *** *******?

***, **** *****, *** ***** ************* *** ******* **.

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