Video Quality / Compression Tutorial

Author: IPVM Team, Published on Jul 17, 2012

While CODECs, like H.264, H.265, and MJPEG, get a lot of attention, a camera's 'quality' or compression setting has a big impact on overall quality. In this training, we explain what this level is, what options you have and how you should optimize it.

To start, review these two images, (A) and (B):

a vs B

And answer this question before continuing:

If your gut feel is that this is a trick question you are right. With the information presented, the best answer is likely that it cannot be determined. In this case, technically the correct answer is 'neither - they are the same resolution'. We used the same camera for each image and simply lowered the quality level for the 'B' image (while keeping everything else the same, including resolution - 720p - and CODEC - H.264).

The fact that two exact shots with the same resolution can look significantly different has a number of important implications. Inside, we explain why, covering:

  • Quantization levels
  • Bandwidth vs. quality loss
  • Image quality examples
  • Manufacturer differences
  • MBR/VBR/CBR impact
  • Smart codec impact
  • Recommendations

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** *****, ****** ***** *** ******, (*) *** (*):

a vs B

*** ****** **** ******** ****** **********:

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  • ************ ******
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[***************]

Quantization ******

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Key ********: ********* **. ******* ****

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Demonstrated ** ********

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Manufacturer **********

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****

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*** *** *** ********* **** * ******/****** *****:

***** *** *** ********* ****** ****** **** *****:

********** ** **, **** *********** ** ******* ** ~** ** the ************ *****.

*****

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*********

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Important: ***/***/*** ******

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*** **** ** *** *** ****** ** ***** ********* *****, see ****** ** *** ** *** - ************ *****************.

Smart ***** ******

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What ****** *** ***?

**********, *** **** ********* ******** **: **** ******* ******* ** necessary ** *** ******'* ***********?

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*******, ***** ***** *****, ** ***** *** *** ***************:

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  • *** ***** ****** (*** *********):******* ** ***** ******* ******* ********** ** **** ******, ** smart ****** ** **** ******** ********, ** ***** *** ** able ** ******** ***** ******* ***** *********, ***** ******** ****** lower **** ******* ******.
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