How old? I would have to re-read my notes on the tests, but I do recall setting a bit rate and the cameras and encoders did not exceed the setting but did throttle down substantially with good light and/or no motion. Isn't that the definition of capped bit rate?
I take that back. On re-reading my notes, Axis' CBR capped the bit rate but allowed it to go substantially lower under better conditions. And you are correct: VBR bitrates were allowed to climb without apparent cap.
You are sure putting a lot of effort into this Jihad against IndigoVision. You won't test their products and dismiss them, saying no one is interested, so what is the point on whether they use CBR to describe Constrained Bit Rate or Constant Bit Rate?
This reminds me of your former dislike of Avigilon. You've apparently made peace with them, why not with IV?
This was an excellent sessions. Very valuable when trying to throttle and make your video the best it can be. We spend so much time looking at video compression with Surveillance manufactures. This helps to cut to the chase.
Thanks, Frank. You may also want to see our report Tested: Lowering Bandwidth at Night is Good. We specifically discuss and show examples of capped VBR video at night and the image quality and bandwidth differences (or lack therof).
John I guess article need revision - especialy term MBR looks new injected term which not commonly accepted accross IT. Before you using this, when talks about encoding technology, others as Multiple Bit Rate (MBR). Which is something different. MBR in your description is VBR with MAXRATE (terminology aka ffmpeg). I guess industry not need more confusing acronyms...
a] I have to say that "Multiple bit rate" encoding I played around in past. However never seen MBR in CCTV before read your article. So I guessed it is my ignorance but my opinion currently is that this is something what developed some cctv forum much later.
b] It will not be problem if realy accepted in industry and not in same places when comes talks about encoding. Try google "CBR VBR MBR" at once and you will see - it looks historicaly Multiple Bit encoding are much sooner here that Maximum Bit and used by quite significant players in encoding technology.
c] VBR is in fact already MBR because in real implementations VBR is every time maxrated - never could run out of limits, cause they are of course limited by input buffer, fps etc. which can be in fact recalculated to maxrate. There is nothing as "unlimited" VBR.
BTW I guess also that stat "What stream do you preffer" is misleading because respondents not aware about it. So there are not 3 categories but just two = CBR and VBR.
VBR is in fact already MBR because in real implementations VBR is every time maxrated
In the video surveillance industry, your assertion is simply not true. Historically most VBR implementations in video surveillance did not support a max rate. You can all them unreal or fake but that is reality.
Because of this, maximum bit rate is an important differentiator.
If understand you right you mean that some product in industry had "button maxrate" and others does not even they was maxrated... Well, John I understand fully meaning but in such case MBR realy starts shifting among marketing terms... on other side CBR, VBR are quite well technicaly understand.. so mixing those together in one sentence is like some marketing department doing it. Instead use "VBR with MAXRATE" is much better. And year ago I doubt there was still product without maxrate when you asked repondents. Additionaly statistics about CBR/VBR/MBR in stat are then like question "Do you know that you have there maxrate knob for VBR"? So answer is that ~44% people do not know about them (38% of 38%+48%)...
It depends if more significantly talks about encoding or about cctv marketing. I guessed originaly that this is about technical aspects of stream codec/encoding. At least you should revise definition into:
MBR stands for VBR where maximum bit rate is defined by user
We have experienced issues using VBR on some models of Dahua cameras. Specifically their 12MP fisheye domes. They have some flashing issue that happens when using VBR (MBR). We had to resort to CBR in order to keep the flashing from happening.