currently we are doing design for a project to deliver IPTV system.  the client asked us to make limit on the BW max 5 MB we told them that some chanells require more than 5MB and other require less.
can any body give me explaination why chanells usually consume diferent BW.  i.e some require 2 MB and others 12 M for example. i need technical explaination please

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With the equipment that I use, the rate at which an asset is encoded is the rate that it is streamed at.  So, if you have assets encoded at different rates or resolutions, they are each going to use different bandwidth over time to play back or stream. That goes for live or pre-encoded streams.  For instance if you have a program that's 480x480 res @ 4 Mbps, obviously that's going to take up more bandwidth than a 240x240 res @ 2.2 Mbps stream.  This is assuming Mpeg-2 encoding. There are lots of factors about your setup that you would have to define in detail in order to respond more fully to your question.

Chanells usually consume different BW because the broadcaster uses a variable bit rate MPEG2 coding in order to assure constant quality.

If you want a limit on the BW, channels should be re-coded in the Video Head-End using constant bit rate MPEG2.

 

Bye

Hi all,

Appart from the codec used, the compression bit rate depends on the kind of content to be encoded, and other factors such as the resolution of each frame, as well as the structure of the encoded pictures (in MPEG terminology, a GOP).

Sports are difficult to compress because they have a lot of movement. On the other hand, news or cartoons are not so bandwidth demanding.

MPEG-4 part 10 (H.264) is currently becoming one of the best choices in terms of quality and bandwidth required.

Regards,

dmb01

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Hi

You have done a good question, it’s really interesting. If you get any good reply, so please let me know. So I’ll also get some good idea.

Thanks for your future help.

Digital Video Editing

 

Hi,

the compression bit rate depends on the kind of content to be encoded if we use VBR MPEG2 encoding.

Actually in IPTV deployments compression bit rate is independent of content because CBR MPEG2 encoding is used in order to satisfy access network bandwidth requirements.

 

BR