How To Calculate IP Camera Bandwidth

0
1658
Halaman:
Sertakan sumber dengan jelas jika ingin mencopy. Selalu cek tanggal, karena mungkin ada beberapa artikel lama yang belum disesuaikan dengan fakta terbaru

How To Calculate IP Camera Bandwidth In a vacuum  IP cameras  are more powerful than their analog/CCTV cousins.   However the strength and reliability of a network can bring an IP camera to its knees if the proper amount of bandwidth is not available to handle the information being processed.

A reason why IP cameras are gaining in popularity is because network infrastructures are constantly growing in size and capabilities as are internet speeds.   Just like uploading or downloading images or video to/from the internet, speed plays a crucial role in the quality of that experience.   The same goes for accessing stored or live images from your computer s network or, accessing them remotely via the internet.

Video Compression

Were it not for compression formats known as codecs (coding-decoding), digitized video which consumes hundreds of Mbps (mega bits per second)  worth of bandwidth,  would not be practical to transmit over an IP based network and would be costly in terms of amount of space need to store the data.

In a vacuum  IP cameras  are more powerful than their analog/CCTV cousins.   However the strength and reliability of a network can bring an IP camera to its knees if the proper amount of bandwidth is not available to handle the information being processed.




A reason why IP cameras are gaining in popularity is because network infrastructures are constantly growing in size and capabilities as are internet speeds.   Just like uploading or downloading images or video to/from the internet, speed plays a crucial role in the quality of that experience.   The same goes for accessing stored or live images from your computer s network or, accessing them remotely via the internet.

Video Compression

Were it not for compression formats known as codecs (coding-decoding), digitized video which consumes hundreds of Mbps (mega bits per second)  worth of bandwidth,  would not be practical to transmit over an IP based network and would be costly in terms of amount of space need to store the data.

In a vacuum  IP cameras  are more powerful than their analog/CCTV cousins.   However the strength and reliability of a network can bring an IP camera to its knees if the proper amount of bandwidth is not available to handle the information being processed.

A reason why IP cameras are gaining in popularity is because network infrastructures are constantly growing in size and capabilities as are internet speeds.   Just like uploading or downloading images or video to/from the internet, speed plays a crucial role in the quality of that experience.   The same goes for accessing stored or live images from your computer s network or, accessing them remotely via the internet.

Video Compression

Were it not for compression formats known as codecs (coding-decoding), digitized video which consumes hundreds of Mbps (mega bits per second)  worth of bandwidth,  would not be practical to transmit over an IP based network and would be costly in terms of amount of space need to store the data.

So, various compression formats have been developed to reduce large amounts of redundant information.

Video Compression Formats

The most common video compression formats used today are:

  • Motion JPEG (M-JPEG)   Represented as  a series of of JPEG images.
  • MPEG-4   The next generation of MPEG (Moving Picture Experts Group) that supports low-bandwidth consuming applications (such as cell phones) and applications that require high quality images and with virtually unlimted bandwidth.
  • H.264   The latest standard for video encoding that provides good video at low bit rates.

Many IP cameras are designed to handle multiple compression formats for different applications such as the  Axis M1011-W  with individually configurable video streams in Motion JPEG, MPEG-4, and H.264.

Another example is the Sony  SNC-CH210  which also supports all three codecs and offers Dual Streaming capability which allows for any combination of JPEG/MPEG-4/H.264 including multiple streams of the same format.

Variable and Constant Bit Rate

An important aspect of compression formats is the bit rate used and oftentimes it is possible to select the rate   constant bit rate (CBR) or variable bit rate (VBR).   Bit rate is simply the rate (in a given amount of time) at which bits (data) are transferred from one location to another.

With limited bandwidth the preferred mode is CBR because this mode generates aconstant  and predefined bit rate.   The downside is that the image quality will vary depending on the amount of motion in the video scene.   No motion = high image quality.   Increased motion = low image quality (the more movement in a scene, the more data being transferred).

When there s a need for high quality images and the network infrastructure has a high capacity, VBR is the desired bit rate.   When there is motion in a scene image quality can be maintained because the bit rate is allowed to  vary  to achieve  this high quality and because the network has the available bandwidth to handle it.

Network Desgin Considerations

Depending on the level of quality you re looking to get out of your surveillance system, different compression standards and configuration can and should be considered.   No single standard fits all solutions.

  • Frame Rate    What s the required frame rate?   Below 5 fps Motion JPEG is a good choice and can be controlled by video motion detection on the camera.   For higher frame rates MPEG-4 is best for it s bandwidth and storage saving ability.
  • Bandwidth    What s the available network bandwidth?   Consider CBR vs. VBR and remember that image quality may suffer when there is motion.
  • Image Quality    What s the acceptable level of image degradation allowed for your application?   Compression ratios above 90% can be used  if the scene is not terribly complex.
  • Latency    How much latency (time) for the compression process is allowed?  PTZ IP Cameras  need low latency for their live images but, if video is only recorded latency may not be an issue.
  • Robustness    How robust/secure must your system be and what is your budge for this system?   Is it acceptable for video to be lost for X amount of seconds if the network drops a frame?
  • Standard & Compatibility   Is openness of your system and compatibility with other systems important  for the ease of use you re looking for?   If so, be certain you choose products that follow the standard 100%.

Bandwidth and Storage Calculators

A number of free bandwidth and storage calculators are provided free to use by IP camera manufacturers.   Here are a couple for you to try:

Please call us at 866-885-4853 if you have any further questions regarding the proper IP cameras for use your available  network bandwidth.

So, various compression formats have been developed to reduce large amounts of redundant information.

How To Calculate IP Camera Bandwidth

Jangan lupa tinggalkan komentar ya gais

This site uses Akismet to reduce spam. Learn how your comment data is processed.