How can I list the available video modes for a USB webcam in Linux?
If you have v4l (video 4 linux 2) installed you can do:
v4l2-ctl --list-formats
The accepted answer (v4l2-ctl --list-formats) seems to show only the first available format, e.g.:
$ v4l2-ctl --list-formats
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: ''
Name : 2036315a-0000-0010-8000-00aa003
Index : 1
Type : Video Capture
Pixel Format: ''
Name : 00000050-0000-0010-8000-00aa003
To see all available formats, you may want to use a script along similar to the following:
$ for d in /dev/video* ; do echo $d ; v4l2-ctl --device=$d -D --list-formats ; echo '===============' ; done
/dev/video0
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Intel(R) RealSense(TM) 410
Bus info : usb-0000:00:14.0-1
Driver version: 4.4.13
Capabilities : 0x84200001
Video Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'Z16 '
Name : Depth data 16-bit (Z16)
Index : 1
Type : Video Capture
Pixel Format: ''
Name : 00000050-0000-0010-8000-00aa003
===============
/dev/video1
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Intel(R) RealSense(TM) 410
Bus info : usb-0000:00:14.0-1
Driver version: 4.4.13
Capabilities : 0x84200001
Video Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: ''
Name : 00000032-0000-0010-8000-00aa003
Index : 1
Type : Video Capture
Pixel Format: 'UYVY'
Name : UYVY 4:2:2
Index : 2
Type : Video Capture
Pixel Format: 'Y8I '
Name : Greyscale 8 L/R (Y8I)
Index : 3
Type : Video Capture
Pixel Format: 'Y12I'
Name : Greyscale 12 L/R (Y12I)
===============
$ v4l2-ctl -D -d /dev/video1 --list-formats-ext
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Intel(R) RealSense(TM) 410
Bus info : usb-0000:00:14.0-1
Driver version: 4.4.13
Capabilities : 0x84200001
Video Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: ''
Name : 00000032-0000-0010-8000-00aa003
Size: Discrete 424x240
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 480x270
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 848x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Index : 1
Type : Video Capture
Pixel Format: 'UYVY'
Name : UYVY 4:2:2
Size: Discrete 424x240
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 480x270
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 848x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Index : 2
Type : Video Capture
Pixel Format: 'Y8I '
Name : Greyscale 8 L/R (Y8I)
Size: Discrete 424x240
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 480x270
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 640x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 848x480
Interval: Discrete 0.011s (90.000 fps)
Interval: Discrete 0.017s (60.000 fps)
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.167s (6.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Index : 3
Type : Video Capture
Pixel Format: 'Y12I'
Name : Greyscale 12 L/R (Y12I)
Size: Discrete 960x540
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.040s (25.000 fps)
Interval: Discrete 0.067s (15.000 fps)
If you use uvc controls for a webcam, another method is :
uvcdynctrl -f
You can also do :
uvcdynctrl -l
to list all the devices.