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MV snapshot API not consistent

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MV snapshot API not consistent

Hi, I'm working with MV snapshot API but I got non consistent picture.

 

If I try to get a snapshot on the past using this url:

 

{{baseUrl}}/networks/{{networkId}}/cameras/{{serial}}/snapshot (with proper values set)

 

and with this body (an example)

 

{
"timestamp": "2019-03-13T12:01:58+00:00"
}
 
I got a snapshot with non person inside, but if I view the video at the same time point I have a person. I have no way to identify the real timespan of the snapshot as this would require to have a timestamp overlay on the picture (which id desirable) or the cam looking at a precise clock to compare time differences.
 
I suspect the snapshot takes the nearest keyframe from the video which is not always the required timestamp.
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