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

***** ******, **** *.***, *.***, *** *****, *** * *** of *********, * ******'* '*******' ** *********** ******* *** * big ****** ** ******* *******. ** **** ********, ** ******* what **** ***** **, **** ******* *** **** *** *** you ****** ******** **.

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

a vs B

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

** **** *** **** ** **** **** ** * ***** question *** *** *****. **** *** *********** *********, *** **** answer ** ****** **** ** ****** ** **********. ** **** case, *********** *** ******* ****** ** '******* - **** *** the **** **********'. ** **** *** **** ****** *** **** image *** ****** ******* *** ******* ***** *** *** '*' image (***** ******* ********** **** *** ****, ********* ********** - 720p - *** ***** - *.***).

*** **** **** *** ***** ***** **** *** **** ********** can **** ************* ********* *** * ****** ** ********* ************. Inside, ** ******* ***, ********:

  • ************ ******
  • ********* **. ******* ****
  • ***** ******* ********
  • ************ ***********
  • ***/***/*** ******
  • ***** ***** ******
  • ***************

[***************]

Quantization ******

********** ** ***** **** (*****, ********, ****-*, *.***), *** ** cameras ***** ******* ******, ***** ****** '***********' ** '************'.

*.*** ************ ** * ******** ** * ******** ***** ***** varies **** * ** **, **** ***** ******* ******* **** compression, *** **** ****** *******. ** **** ***** **************** ** you, ** ** **************, *** ***** ************ **** ****** **** in *.*** *********.

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

*** *** ******** ** ******* ************ ** *********** *** **** 'loss' *** *** ******* ** ****** *** * ********** ******** in *********. ****** **** *** ********** ************ ***** *********** ** '*****', ******* **** **** *********** **** ** **** **** ***** is **********.

*** ******** ***** **** ** **** ** *** **** *********** loss ** **********. ******** ***********/***** *** ******* ***** *** *** save ** *********, *** ****** *******. ******** *******/****** *********** *** you *** **** ****** *******, *** *** **** ********* *** reduce ******* ****.

Demonstrated ** ********

*** ***** ***** ***** *** ****** ** ******** ******* ******. In ***** ** **** ****, ** **** ******** **** *** scenes (****** / ****** *** ******* / *******) *** ******** bitrate. *** ******* *** (************) ****** *****, ********** ** *** can ** **** ********** ** **** ****** ** ******* **** up. *********, ***** ******* *********, **** **** ********** *** ******** on *******. **** **** ** **** * *** ****** ** simply **** *** ******* ** *******.

Manufacturer **********

*** ************* *** ******* ******* ******. **** ** *** ***** touch ***** ********, *** ************ **** **** * ****** *** you. *******, **** *** **** ******** ** ************ *******, ************* options *** ********* ** *** ******** ***** ****** ****.

*****, ** **** ** * *** ************* ** ****** *********** their **********. ******* ****** *** ***** ****** ************ *********** ************** *** **** ******* ** **+ ************* *********** ****** *** how ** ******* ***** ******* ** "*******" ***********.

****

**** ********* **** *** ********* *** **********, ** **** ** their ******* **** *** *** ************ ** ******** ***** ***** **. **** *** *** *** *** *** ***** ** ******* as "***********", **** ****** ******* ***** **** **********/***** *********. ****** of ****, ** ************* ***** *** ****** ******** *** ***** thinking ** ********* ***** *******.

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

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

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

*****

*****'* ***** ***** ***** ************ ** *-******, **** *-****** ******* to **** ** * ******** ****** ("*/*-***** ***** **" *****). So ** *-****** *** *** ** ** *** *-****** *** to -*, *-****** **** *** * ******* ** ** ************.

*********

*********'* *********** ******** *** ***** *** *****/***** ***, ** * scale ** "******" (**** ***********) ** "*******" (***** ***********), ********** to "******." ***** ******** *** ****** ** ******** ************ ******, ranging **** ~**-**.

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

**** ************ *********** *** ******** *** **** ********* (***), ***** varies ********* ** ***** ** ******** * ***-*** ******* *****, sometimes **** * ******* *** **** *** (****** ***). *** levels *** ***** ****** *** ************ ***** *** ****** ** targeting, *.*., ** **** ****** **** ****** ************ ***** **, with ******* ********** *** ********** ** *********.

*******, ** ******* *** *** ** ******** *** ****, ******* level ** *** ************ ******* *** *** ****, ** ********** is '********', **** ******* ***** ************* ******** ** **** ********* the ****. *** ********, ** *** **** * *** ***** stream *** ** ***/* ******* ** * ***** ****, *** camera *** *** * '****' ******* ***** ***** ** ** easy ** ********. *******, ** *** ****** *** ****** *** and * **** ** ***** ** ***** ** *** ******, it *** **** ** **** **** ** '***' ******* ** maintain *** **** ***/* ******** *** **** ** *********** ** more *********.

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

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

******* ************ ******, ** *** **** *** *****, ****** ************* have *************** ******, ***** ***** ***** ******* ** **** ***** ** ******** in *** *****. ** * ****** ** ******* ****** ******* a ******* *** **** ** ****** *******, ***** ****** **** and ***** ** *** ********** *** ***** *******. ********* ********, these ****** ***** *** ******* ** ****** ***** ******* ******** to ******** (***-"*****") ******, *** ** **** ***** ********, **** 25-30% ***** ********* ******, *** ** **** ** **% ***** possible.

*******, ** ******** ********* ******* **** ***** ****** ** *** scene ***** *** ****** **** ** *********, ** **** ******** image ******* ******* *** ** ****. *** *******, ** *** of *** *****, ****** ****** ** ***** ***** ******** ****** blurring/smearing/artifacts ** *** *****, ******* ** *** ******* *** ********** below. ******** ****** ** ********* ******** ** ***** ***** ******.

******* ****** **** *** ******** ***** ******** **** *********** ** ***** *** ***** **************.

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

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

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

  • *** ***** ***** ** * ********** ******** ****. ******** **** a ************ ***** ** ** ** ** ** ** ** 41 ******** ** ******* **********. ***** *** ******* *** ****** imperceptible *** *********.
  • *** ***** ***** ******* ** *** ********** ** *** *****. More ******* ****** (**** ** ************) **** ********* ******* **** a ****** ******* ****** **** * ****** ***** (**** * stairwell). *** ******* *** ******** ***** ******** (**** * ****** across ** ************), *** **** ****** ******* ****** *** ******* meaningful *******.

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

  • ************ ~** ** *** "***** ****":***** ** ***** ** ******* *******, ** **** ***** ** to ***** *** **** ********* ******* ********* *** ***** *******. Many ************* ******* ** **-**, ****** ***** ****** *** ***** ****** ************ *********** ************* **** ******* ** *** ** *********** ******.
  • *** ***** ****** (*** *********):******* ** ***** ******* ******* ********** ** **** ******, ** smart ****** ** **** ******** ********, ** ***** *** ** able ** ******** ***** ******* ***** *********, ***** ******** ****** lower **** ******* ******.
Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports

Camera Course - Last Day - Save $50 on Jan 18, 2018
Today is the last day to save $50 - register now. Learn video surveillance and get certified. Save $50 on the course, ending this Thursday the...
VSaaS Usage Statistics 2018 on Jan 18, 2018
VSaaS has been a 'next big thing' for more than a decade. The prospect of managing, storing and streaming video from the cloud rather than...
The 2018 Surveillance Industry Guide on Jan 16, 2018
The 300 page, 2018 Video Surveillance Industry Guide, covering the key events and the future of the video surveillance market, is now available,...
Multicasting Surveillance Tutorial on Jan 04, 2018
Network bandwidth can be a concern for some surveillance systems. While improvements in video codecs, such as smart codecs for H.264 and H.265,...
Cabling Best Practices Guide on Jan 03, 2018
Surveillance cabling can be a major problem. Poorly installed and maintained networks are often costly, lengthy, frustrating ordeals to...
2018 IP Networking Book Released on Jan 03, 2018
The new IP Networking Book 2018 is a 228-page in-depth guide that teaches you how IT and telecom technologies impact modern security...
Multi-Imager Camera Guide on Jan 02, 2018
Multi-imager usage continues to grow, with most manufacturers now offering at least one model, making them an attractive option for covering wide...
QoS for Video Surveillance on Dec 29, 2017
Along with VLANs, QoS is one of the most misunderstood topics in IP surveillance networks. Many purported "experts" claim it is required in any...
Resolution Tutorial on Dec 28, 2017
Understanding video surveillance resolution can be surprisingly difficult and complex. While the word 'resolution' seems self-explanatory, its use...
Repositionable Multi-Imager Camera Guide on Dec 22, 2017
Multi-imager usage has been growing strongly over the past few years. Now, a new segment of multi-imagers has taken off, with many manufacturers...

Most Recent Industry Reports

Vivint Streety Video Strengthens Door Knocking on Jan 17, 2018
Vivint is famous (or infamous depending on your perspective) for mastering large scale door to door selling. The company has skyrocketed from a...
Axis: "It’s A Question Of Trust And Who You Want To Be Associated With" on Jan 17, 2018
Who do you trust? Who do you want to be associated with? Axis is raising hard questions to start 2018. In this note, we examine these questions,...
Software House Vulnerability Allows Inside Attacker To Open Doors on Jan 17, 2018
A vulnerability in Software House IP-ACM modules allows an attacker to potentially unlock doors, or perform other actions, on affected systems....
'Defiant' Hikvision 'Strikes Back' At WSJ And US on Jan 16, 2018
The fight is on. Hikvision and their owner, the Chinese government, 'strikes back' against the Wall Street Journal and US politicians raising...
Camera Course - Last Day - Save $50 on Jan 16, 2018
Today is the last day to save $50 - register now. Learn video surveillance and get certified. Save $50 on the course, ending this Thursday the...
The 2018 Surveillance Industry Guide on Jan 16, 2018
The 300 page, 2018 Video Surveillance Industry Guide, covering the key events and the future of the video surveillance market, is now available,...
Edward Snowden Haven App Tested on Jan 16, 2018
Global coverage followed the December 2017 announcement that Edward Snowden was leading a team developing Haven, an app "that leverages on-device...
This High Schooler Is Excited About His Future Security Career on Jan 15, 2018
A common lament is that smart, young people have little interest in surveillance systems. In fact, discussions like Should Talented Young People...
"First Of Its Kind" Stove Knob Alarm Sensor (2GIG) on Jan 15, 2018
At CES 2018, 2Gig/Nortek announced the Stove & Grill Guard, a "first of its kind" sensor in the security industry, allowing users to be...
Amazon Deep Learning Partnership With AgentVi on Jan 15, 2018
Amazon is aiming to grow its Kinesis Video Streams offering that "enables you to quickly build computer vision and ML applications" in the cloud....

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact