ONVIF & Pre Event Image Count ???

[IgorA100]

I still can't figure out if the Pre Event Image Count buffer value is used when using ONVIF detection?
Logically, it should be used with "Decoding = Always"
In practice, it seems that it is not used.

[iconnor]

It should be. The packet queue should maintain a buffer of that size + keyframe. SOmetimes it can't and there will be a log entry about it.

[IgorA100]

Yes, Pre Event Image Count & Post Event Image Count work when using ONVIF detection if specified:
Decoding = Keyframes + Ondemand and Decoding = Always. I haven't checked for other "Decoding" values.
BUT! the above buffers are not used correctly.
I use a short-term event ~1-2 sec.
For example, the camera has 20FPS, if I specify

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Pre Event Image Count=20

, then the event is not recorded! If I specify

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Pre Event Image Count=60

, the event is recorded, but there are only 40-50 frames before the event. At the same time, the location of the event is not correctly marked on the time strip; as a rule, the marked event is shifted forward in time, although in reality it happened earlier.