Detect camera resolution on raspberri

by Devin Yang
(This article was automatically translated.)

Published - 5 years ago ( Updated - 5 years ago )

pi@raspberrypi:~$ v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'YUYV'
Name : YUYV 4:2:2
Size: Discrete 320x240
Interval: Discrete 0.005s (187.000 fps)
Interval: Discrete 0.007s (150.000 fps)
Interval: Discrete 0.007s (137.000 fps)
Interval: Discrete 0.008s (125.000 fps)
Interval: Discrete 0.010s (100.000 fps)
Interval: Discrete 0.013s (75.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.020s (50.000 fps)
Interval: Discrete 0.027s (37.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.020s (50.000 fps)
Interval: Discrete 0.025s (40.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)

Install fswebcam

sudo apt install fswebcam

In a non-root account, you must first give video0 hardware permissions

sudo usermod -G video ${USER}

snapshot

fswebcam -r 640x480 --no-banner image3.jpg
--- Opening /dev/video0...
Trying source module v4l2...
/dev/video0 opened.
No input was specified, using the first.
--- Capturing frame...
Captured frame in 0.00 seconds.
--- Processing captured image...
Disabling banner.
Writing JPEG image to 'image3.jpg'.

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Devin Yang

Feel free to ask me, if you don't get it.:)

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