I fished out a Pi 4 and a camera module 3 and tried this out. I ranfrom a terminal window running in the desktop. I found that it mostly claimed 50fps in the title bar but it is flipping down to 25fps as well (so frames are being dropped).
I tried putting "force_turbo=1" into my /boot/firmware/config.txt and added "--buffer-count 16" to the rpicam-hello command line and I thought that reduced the number of frame drops noticeably, but there are still some.
Performance might be slightly better if you're running in console mode, I'm not sure (because there's no title bar to tell you the instantaneous fps), but it might be worth a try.
Code:
rpicam-hello --viewfinder-width 1920 --viewfinder-height 1080 --framerate 50 --preview 0,0,1920,1080 -t 0I tried putting "force_turbo=1" into my /boot/firmware/config.txt and added "--buffer-count 16" to the rpicam-hello command line and I thought that reduced the number of frame drops noticeably, but there are still some.
Performance might be slightly better if you're running in console mode, I'm not sure (because there's no title bar to tell you the instantaneous fps), but it might be worth a try.
Statistics: Posted by therealdavidp — Thu Mar 13, 2025 1:33 pm