Linux Webcam Detection
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Zach 'Hoeken' Smith
Jun 30, 2013, 9:29:42 AM6/30/13
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Botqueue v0.4 is almost ready and the one thing holding me back is figuring out the right way to scan for webcams on linux/raspberry pi. One option is just to do a ls /dev/video* and call it a day.
I'd rather be complete though and do it 'properly' but I can't figure out the right way to do that and fswebcam doesn't seem to have a list cameras option.
Any ideas?
Zach Hoeken Smith
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Zach 'Hoeken' Smith
Jun 30, 2013, 9:43:40 PM6/30/13
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Okay, I dug into it a little bit more and I have 2 options. Can you folks on linux and/or raspberry pi run these commands and send me the output? I've tested it on my end with a bunch of cameras and crap, but I want to make sure I don't miss anything strange out there.
#install the programs
sudo apt-get install uvcdynctrl v4l-utils
#run these and send me your output
uvcdynctrl --list
v4l2-ctl --all
v4l2-ctl --info
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Blog: www.hoektronics.com
Twitter: @hoeken Skype: chilldude22
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Justin Nesselrotte
Jun 30, 2013, 9:50:44 PM6/30/13
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This is without any webcam. I'll post tomorrow with a webcam when I have one:
uvcdynctrl --list
Listing available devices:
No devices found.
v4l2-ctl --all
Failed to open /dev/video0: No such file or directory
v4l2-ctl --info
Failed to open /dev/video0: No such file or directory
Sorry about the lack of USB camera. Any idea on the Mac? I can work on that side if you need me to.
Zach 'Hoeken' Smith
Jun 30, 2013, 10:05:15 PM6/30/13
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Oh, mac is easy and done already. :)
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Twitter: @hoeken Skype: chilldude22
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graphmastur
Jun 30, 2013, 10:06:42 PM6/30/13
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Really? Awesome work! How do you do it on Mac? Does it have to be a Mac webcam, or does an external usb one work?
Zach 'Hoeken' Smith
Jun 30, 2013, 10:30:53 PM6/30/13
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Both. the imagesnap program has a list cameras option. :)
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Work: www.haxlr8r.com
Blog: www.hoektronics.com
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Philip Booysen
Jul 1, 2013, 10:41:29 AM7/1/13
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Apologies, away from my Bot for another 12 days. Will only submit then if it still makes sense.
P
P
Justin Nesselrotte
Jul 1, 2013, 10:59:24 AM7/1/13
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With a camera:
On Sunday, June 30, 2013 8:29:42 AM UTC-5, Zach Smith wrote:
uvcdynctrl --list
Listing available devices:
video0 Microsoft LifeCam VX-5000
Media controller device: /dev/media0
ERROR: Unable to open media controller device '/dev/media0': Permission denied (Error: 13)
ERROR: Unable to list device entities: Invalid device or device cannot be opened. (Code: 5)
v4l2-ctl --all
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Microsoft LifeCam VX-5000
Bus info : usb-bcm2708_usb-1.2
Driver version: 3.6.11
Capabilities : 0x04000001
Video Capture
Streaming
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'YUYV'
Field : None
Bytes per Line: 1280
Size Image : 614400
Colorspace : Unknown (00000000)
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 1/1
Video input : 0 (Camera 1: ok)
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
v4l2-ctl --info
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : Microsoft LifeCam VX-5000
Bus info : usb-bcm2708_usb-1.2
Driver version: 3.6.11
Capabilities : 0x04000001
Video Capture
Streaming
I'll try to get another camera to test later.
On Sunday, June 30, 2013 8:29:42 AM UTC-5, Zach Smith wrote:
Zach 'Hoeken' Smith
Jul 1, 2013, 11:00:40 AM7/1/13
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actually it appears that uvcdynctrl -l -v is more useful. could you get me the output from that too?
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Blog: www.hoektronics.com
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Justin Nesselrotte
Jul 1, 2013, 11:23:41 AM7/1/13
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Yeah, of course:
uvcdynctrl -l -v
Listing available devices:
video0 Microsoft LifeCam VX-5000 [uvcvideo, usb-bcm2708_usb-1.2]
Media controller device: /dev/media0
ERROR: Unable to open media controller device '/dev/media0': Permission denied (Error: 13)
ERROR: Unable to list device entities: Invalid device or device cannot be opened. (Code: 5)
Although that didn't tell you much else. I shall invoke the power of root:
sudo uvcdynctrl -l -v
Listing available devices:
video0 Microsoft LifeCam VX-5000 [uvcvideo, usb-bcm2708_usb-1.2]
Media controller device: /dev/media0
Entity 1: Microsoft LifeCam VX-5000. Type: 65537, Revision: 0, Flags: 0, Group-id: 0, Pads: 1, Links: 0
Device node
Entity: 1, Pad 0, Flags: 1
Entity 2: Processing 2. Type: 131072, Revision: 0, Flags: 0, Group-id: 0, Pads: 2, Links: 1
Subdevice: Entity: 2, Pad 0, Flags: 1
Entity: 2, Pad 1, Flags: 2
Out link: Source pad { Entity: 2, Index: 1, Flags: 2 } => Sink pad { Entity: 1, Index: 0, Flags: 1 }
Entity 3: Camera 1. Type: 131072, Revision: 0, Flags: 0, Group-id: 0, Pads: 1, Links: 2
Subdevice: Entity: 3, Pad 0, Flags: 2
Out link: Source pad { Entity: 3, Index: 0, Flags: 2 } => Sink pad { Entity: 2, Index: 0, Flags: 1 }
Out link: Source pad { Entity: 3, Index: 0, Flags: 2 } => Sink pad { Entity: 4, Index: 0, Flags: 1 }
Entity 4: Extension 4. Type: 131072, Revision: 0, Flags: 0, Group-id: 0, Pads: 2, Links: 0
Subdevice: Entity: 4, Pad 0, Flags: 1
Entity: 4, Pad 1, Flags: 2
Justin Nesselrotte
Jul 1, 2013, 11:34:34 AM7/1/13
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I tried running it with this camera, and I got:
[2013-07-01 10:26:28,386] ERROR: dummy: Webcam: Error opening device: /dev/media0
[2013-07-01 10:26:28,390] ERROR: dummy: Webcam: open: Permission denied
[2013-07-01 10:26:28,393] ERROR: dummy: Webcam: Error opening device: /dev/media0
[2013-07-01 10:26:28,396] ERROR: dummy: Webcam: open: Permission denied
[2013-07-01 10:26:28,399] ERROR: dummy: Webcam: Unable to find a source module that can read /dev/media0.
[2013-07-01 10:26:28,403] ERROR: dummy: Webcam:
Running with sudo, I got (Don't run with sudo, it messes up the files for anyone else reading this):
[2013-07-01 10:33:20,747] ERROR: dummy: Webcam: /dev/media0: Not a V4L2 device?
[2013-07-01 10:33:20,750] ERROR: dummy: Webcam: /dev/media0: Not a V4L device?
[2013-07-01 10:33:20,763] ERROR: dummy: Webcam: VIDIOCGCAP: Inappropriate ioctl for device
[2013-07-01 10:33:20,767] ERROR: dummy: Webcam: Unable to find a source module that can read /dev/media0.
[2013-07-01 10:33:20,770] ERROR: dummy: Webcam:
Zach 'Hoeken' Smith
Jul 1, 2013, 9:11:29 PM7/1/13
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That'll work. I can parse that no problem. --
Nick Foley
Jul 22, 2013, 3:59:37 PM7/22/13
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Seem to be getting this same set of errors with a Microsoft Lifecam HD-6000
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matthew bennett
Aug 2, 2013, 5:04:26 PM8/2/13
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I'm just digging into Botqueue, and I'm liking it! Thanks, Zach!
I'm trying to use a Logitech C270 and botqueue 0.4, and it's not quite working. I think it's on /dev/video0 . Here's my output:
~$ uvcdynctrl -l -v
[libwebcam] Unsupported V4L2_CID_EXPOSURE_AUTO control with a non-contiguous
range of choice IDs found
[libwebcam] Invalid or unsupported V4L2 control encountered: ctrl_id = 0x009A0901, name = 'Exposure, Auto'
Listing available devices:
video0 UVC Camera (046d:0825) [uvcvideo, usb-0000:00:1d.0-2]
v4l2-ctl --all
Driver Info (not using libv4l2):
Driver name : uvcvideo
Card type : UVC Camera (046d:0825)
Bus info : usb-0000:00:1d.0-2
Driver version: 3.2.14
Capabilities : 0x04000001
Video Capture
Streaming
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'MJPG'
Field : None
Bytes per Line: 0
Size Image : 31466
Colorspace : SRGB
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 1/1
Video input : 0 (Camera 1: ok)
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
I'm trying to use a Logitech C270 and botqueue 0.4, and it's not quite working. I think it's on /dev/video0 . Here's my output:
~$ uvcdynctrl -l -v
[libwebcam] Unsupported V4L2_CID_EXPOSURE_AUTO control with a non-contiguous
range of choice IDs found
[libwebcam] Invalid or unsupported V4L2 control encountered: ctrl_id = 0x009A0901, name = 'Exposure, Auto'
Listing available devices:
video0 UVC Camera (046d:0825) [uvcvideo, usb-0000:00:1d.0-2]
v4l2-ctl --all
Driver Info (not using libv4l2):
Driver name : uvcvideo
Bus info : usb-0000:00:1d.0-2
Driver version: 3.2.14
Capabilities : 0x04000001
Video Capture
Streaming
Format Video Capture:
Width/Height : 640/480
Field : None
Bytes per Line: 0
Size Image : 31466
Colorspace : SRGB
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 640, Height 480
Default : Left 0, Top 0, Width 640, Height 480
Pixel Aspect: 1/1
Video input : 0 (Camera 1: ok)
Streaming Parameters Video Capture:
Capabilities : timeperframe
Frames per second: 30.000 (30/1)
Read buffers : 0
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