Axis Fixes VBR / CBR Setting
Author: Ethan Ace, Published on Feb 23, 2015
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Comments (12)
Undisclosed #1
Interesting, I tried to get them to change the word "constant" to the proper "constrained" for 6 years with no luck.
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ling chen
Thanks Ethan, for sharing the information.
it seems there are two VBRs ?
1. VBR no Rmax cap
2. VBR with Rmax cap
No CBR setting?
-Ling
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John Honovich
Btw, I think MBR would be a good term to adopt. A 3 letter acronym makes it a clearer contrast to VBR and CBR. CBR is constant, VBR varies and MBR varies to a maximum bit rate.
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Brad Silvernail
The old CBR settings were critical to manage "runaway" bandwidths with some network cameras at night. I think IPVM did one of the first studies on this and validated what we've observed for years. A 720P or 1080P camera that could manage on 2 to 4 Mbps during the day, could drive 10 to 15 Mbps bandwidth at night. The CBR settings, effecting a cap at say 5 mbps, with priority on quality, should really be a default. Thanks for the info. Hadn't seen this in the new firmware yet.
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Undisclosed #2
I am unable to find the mention of that verbiage change in the release notes you linked, nor in the detailed notes of either of the 5.60.x firmware releases for the P3364.
How did you discover it?
Curiously, in the 5.60.1 notes mention is made of a change in the behavior of CBR:
What does that mean, if 'constant' now equals 'maximum'?
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Undisclosed #2
Wow, they are a bit conflused about this change. The paragraphs below are duplicated word for word in this manual, except for changing Constant to Maximum.
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Undisclosed Manufacturer #3
I heard previously from a sytem integrator that Axis' 'CBR' (VBR with a limit) was good at limiting bandwidth, however the SI was not so happy when his customer complained that they lost frames in the recordings of an incident. Turns out that to maintain the bandwidth limit, the codec was dropping frames. This is Ok if you know what's going on but the customer was surprised and complained that his requirement of x fps was not maintained. In some applications a specified fps (or minimum fps) is a legal requirement in Europe. Is that also the case in the US?
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