punacmc wrote:I have found that changing the FPS to 2-5 and matching the encoding, produces video that is sufficient for identification. If I need a still image, it can be extracted from the video stream
how do you manage any good identification with such a few fps? I guess I have a very similar goal and gone the opposite direction, trying to crank up fps/shutter speed (mostly latter) to avoid lots of blurry images. At even 5fps if the subject moves anywhere fast across the frame it's game over. Equally with a low shutter speed,which you need to compensate for the lack of light, images become really blurry/unusable for me.
I have a pinoir sitting mounted on a custom case and I've been testing it with an LED array and the results are really good, if anything I had to tone the array down as some images were basically washed out. I don't care for colors (not useful for identification) so I'm not bothering with a IR cut filter for the day and it's actually not as bad as some pics show once you plug in an additional lens and more light gets through (4mm lens with m12 mount).
I've yet to deploy it and look into false positives over the course of a day tho with light changes, hopefully tweaking motion will give good results like in your case. I'm also still trying to figure out streaming with a custom picamera based lib, there's a lot more smarts that could be implemented in code with a cheap light sensor on the gpio, but raspmjpeg.c is too much for me, need python (performances seem to be ok so far for me, higher than raspimjpeg but more than acceptable).
Also regarding @jbeale comment:
jbeale wrote:Also, due to exposure changes with still/video mode shifting after ending video record mode, it tends to false-detect motion repeatedly so night mode becomes unusable.
from the picamera doc I've learned that there's different ports on the picam, one for the still and one for video (plus another for preview), but you can take stills using the video port. This prevents the mode change, which means there's no frame loss and still/video mode shifting. The downside is that pictures are grainier since the still port applies a bunch of filters, but I'm not fussed by that.