I would like to have 1 second included in the alert clip right before the first motion detected. What should I set the pre-trigger in order to get this? My cameras are running at 15 fps so would 15 be the right setting? Thanks!
Pre-trigger frame buffer setting
- Thread starter 105437
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Unfortunately making that change caused my CPU to run at 100% and frame rate dropped to ~7 fps.
Thanks guys... Both cameras are set to 15 fps and the pre-trigger frame buffer is also set to 15 with direct to disc. BI is running stable around 65% - 70%.
With direct to disk, recording can only begin on an iframe, so you may lose up to one entire i-frame interval worth of frames from your pre-trigger buffer. So whatever your iframe interval is set to, add that number to your pre-trigger frame buffer.
For example, if your iframe interval is 30 and your FPS is 15, and you want one second of video before the motion trigger, then you need a pre-trigger frame buffer size of 45. (15 frames = 1 second, plus 30 for the iframe interval). This will result in you getting 1 to 3 seconds of video before the motion trigger. The amount of pre-trigger video will vary between 1 and 3 seconds depending on the timing of the motion trigger compared to the timing of the iframes in the video stream.
For example, if your iframe interval is 30 and your FPS is 15, and you want one second of video before the motion trigger, then you need a pre-trigger frame buffer size of 45. (15 frames = 1 second, plus 30 for the iframe interval). This will result in you getting 1 to 3 seconds of video before the motion trigger. The amount of pre-trigger video will vary between 1 and 3 seconds depending on the timing of the motion trigger compared to the timing of the iframes in the video stream.