After recently configuring my BI to use sub-streams, HW encoding, and limited decode features, I've managed to get my nearly 50 cameras to use as little as 10% CPU. Love it, grateful for it, but am wondering if I may have jumped the shark a bit.
The clips all seem to be starting mid-action. That is despite disabling object detection, and adding as much as a 4 sec pre-buffer. I've also decreased the I-frame interval from twice the FPS to equal to FPS (i.e. 20FPS, 20 iframe).
I suspect it has to do with the "limit decoding unless required" option that I've enabled on all cameras. I think I understand the concept, whereby the only frames that are "inspected" by the BI motion detection algorithm are the full frames (iframes), but even with them set to match the FPS, I'm still suffering from the delayed recordings.
If I disable all the decoding limits on all the cameras, I'm back up to 40% CPU - so there's definitely a CPU cost to leaving it off. But, capturing vehicle after it's already halfway down the street makes the clip completely useless.
Is there a way to increase the reaction time so that motion triggers capture the movement from the onset?
The clips all seem to be starting mid-action. That is despite disabling object detection, and adding as much as a 4 sec pre-buffer. I've also decreased the I-frame interval from twice the FPS to equal to FPS (i.e. 20FPS, 20 iframe).
I suspect it has to do with the "limit decoding unless required" option that I've enabled on all cameras. I think I understand the concept, whereby the only frames that are "inspected" by the BI motion detection algorithm are the full frames (iframes), but even with them set to match the FPS, I'm still suffering from the delayed recordings.
If I disable all the decoding limits on all the cameras, I'm back up to 40% CPU - so there's definitely a CPU cost to leaving it off. But, capturing vehicle after it's already halfway down the street makes the clip completely useless.
Is there a way to increase the reaction time so that motion triggers capture the movement from the onset?