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Hello everyone, I'm currently working on a project where I'm asked to save (write) frames that I capture with a camera on a Raspberry Pi. The capture time is around 33ms ( = 1/FPS and FPS = 30) and within that period I save the frames that I captured on the RPi's SD card. I'm programming with Python. I used a method of OpenCV to write the frame with a png format but that takes over 50ms which is over the capture time. So I decided to use numpy to save the frames in a npy format and that takes few ms (3ms). Running some test of 10 minutes long, I get these results : https://preview.redd.it/669kk7t7mqc91.p ... p&258dd9ce On average and for most of the times, I get around 3ms time to save one frame. But also very frequently, I get these peaks that reach up to half a second (a loooot). And this cause me to lose frames which is really not what I want. I've tried to save the frame in a jpg format (with OpenCV) or qoi format (with qoi) but nothing changes. I've tried the same experience on a PC and it worked fine which made me conclude that it is related to the RPi. Do you guys have any thoughts of what does this come from ? Do you suggest any other tests that I can do ? Thanks a lot for your help ! submitted by /u/AskMammoth2232 [link] [comments] |
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