Dahua cams...VBR vs CBR: Would you expect a higher amount of motion blur?

Along the same lines as VBR vs CBR, but differ question..
Recently switch a few cams over from CBR @ 15 to VBR, and noticed i am missing the object during the recording. The recording is still triggered, but nothing in the video. Sometimes a brief frame capture showing a partial of the object, but that nothing else. With all settings the same, a switch back to CBR and all is good - captured recordings show object as expected.
Any ideas what is causing this during VBR playback?
 
VBR shouldn't give a worse result. I guess maybe BI need to have a look at the implementation algorithm. It sounds as if it's not giving enough consideration to the guys movement. VBR can be used for 2 purposes: 1. To save bandwidth / space, 2. To allow you to run a much higher maximum bit rate than you might otherwise run by compensating with a lower bit rate when the scene is less taxing - in the context of BI and most of these cameras though, you can't actually set a very high bit rate so it's somewhat useless in that regard. Obviously here, the implementation is amiss, and I'd too be using CBR with those results.
 
CCTVCam said:
VBR shouldn't give a worse result. I guess maybe BI need to have a look at the implementation algorithm. It sounds as if it's not giving enough consideration to the guys movement. VBR can be used for 2 purposes: 1. To save bandwidth / space, 2. To allow you to run a much higher maximum bit rate than you might otherwise run by compensating with a lower bit rate when the scene is less taxing - in the context of BI and most of these cameras though, you can't actually set a very high bit rate so it's somewhat useless in that regard. Obviously here, the implementation is amiss, and I'd too be using CBR with those results.
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There is nothing wrong with blue Iris and VBR. This is 100% related to user error. Most likely due to using smart codec. There are thousands of people here using bi with vbr.
 
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Thx federman! VBR = GOOD, Smart Codec & H.264+ = BAD.
Although would not call this 'user error', both are very usable codecs - except with BI.
 
DsineR said:
Thx federman! VBR = GOOD, Smart Codec & H.264+ = BAD.
Although would not call this 'user error', both are very usable codecs - except with BI.
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It’s not just blue Iris that has issues with these codecs. You will find threads where nvrs have trouble with them as well and other vms. They have a variable Iframe interval that causes this problem.
 
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