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

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Recommendation: *** ***

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

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

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Bandwidth **********

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

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***********

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Comments (4)

Awesome report Ethan, I had started doing this in the last 6 months with no complaints, but not a lot of feedback either.

Thanks! No more complaints from the family at night when my home-office exacqVision system would slow down the network.

In those cases when available, would it be correct to set the compression levels directly thru the use of distinct day/night profiles, in addition to the VBR setting?

Yes, good point, for those manufacturers who support it.

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