[VMS] A choppy consistent video shows in VMS v14.101 viewlog - 20160105

[DerekHo]

Question:
Why a choppy consistent video shows in VMS v14.101 viewlog?

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1. In the following example, the user uses "General Event" for Round the Clock recording. This is why VMS records "Key frame" only.

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2. A total of 24 IP cams are connected to VMS.
FPS = 10, GOP = 3 for Cam1 ~ Cam 21. This means that there will be 1 key frame among every 3 frames.

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3. The recorded file below only contains “Key frame”, which is correct.

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4. For VMS, if there is nothing recorded in 1 second, it will show blank in timeline bar and this is the reason why we got consistent choppy recording data in this case.

a) Cam1-Cam21 (FPS=10 GOP=3):
Based on the schedule and cameras settings, every single file contains 40 key frames (1 per 3 seconds).
Therefore, the timeline bar shows consistent choppy recording data if there is nothing recorded in 1 second. (Which is normal in this case)

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b) Cam21-24 (FPS=10 GOP=1):
Every single file contains 120 key frames (1 per second).
Therefore, the timeline bar shows consistent log without choppy display.

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Reference:
[ UVS - 201512216002 ] VMS v14.101 Weird choppy consistent video