[PD] pix_video, webcam issue on Linux
Hi all,
This may not be specific to Pd/Gem..
I have a webcam I am trying to get working with [pix_video] in the
following environment.
- Ubuntu Studio 9.04,
- Pd-extended 0.41.4 (.deb for the above distro)
- Gem 0.92.2
The camera works fine with Skype for Linux and v4l-test.
However, when specifying the device with [pix_video], I get a series of
errors such as,
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
I've seen posts on this list related to similar errors, in the case of
pdp, with advise to bypass the conditional jumps near where the defines
appear... this did not work with Gem. (Tried with videoVL4.cpp)
After some surfing, my understanding as of now is that Gem is trying to
issue V4L functions, whereas my webcam driver only understands V4L2..
Is this so?
I would appreciate advise on insight on what could be happening here, or
even just workarounds to this case.
Here are some hardware specs I gathered, followed by the output of Gem
(or they could be from ioctl... I am new to V4L).
-- Output of v4l_dump (http://www.raphnet.net/programmation/v4l_tools/)
Using device /dev/video0
struct video_capability
{
name='Laptop_Integrated_Webcam_0.3M'
channels=1
audios=0
maxwidth=640
maxheight=480
minwidth=48
minheight=32
}
VIDIOCGCHAN: Invalid argument
struct video_picture
{
brightness=32768
hue=32768
colour=41942
contrast=0
whiteness=0
depth=16
palette=8
}
-- Pd main window output
[pix_video]: video driver 0: video4linux v4l // --- On object ctreation
verbose( 1):[pix_video]: device-err: 0// --- When sending [device
/dev/video0
verbose( 0):v4l: stopped Transfer
verbose( 1):v4l::startTransfer closing 6
-- Console output ( When sending [device /dev/video0 )
v4l: VDIOCGCHAN: Invalid argument
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
Thank you in advance..
--
David Shimamoto
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Re: [PD] pix_video, webcam issue on Linux
it look like the Gem your using is not compiled with v4l2 suport.
i have somthing like this when creating pix_video :
[pix_video]: video driver 0: video4linux2 v4l2
[pix_video]: video driver 1: video4linux v4l
[pix_video]: video driver 2: ieee1394 dv4l dv
so, for me V4L2 is default.
i think you have to upgrade gem to a version that suport v4l2 in order to use
v4l2 devices...
Cyrille
PSPunch a écrit :
Hi all,
This may not be specific to Pd/Gem..
I have a webcam I am trying to get working with [pix_video] in the
following environment.
- Ubuntu Studio 9.04,
- Pd-extended 0.41.4 (.deb for the above distro)
- Gem 0.92.2
The camera works fine with Skype for Linux and v4l-test.
However, when specifying the device with [pix_video], I get a series of
errors such as,
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
I've seen posts on this list related to similar errors, in the case of
pdp, with advise to bypass the conditional jumps near where the defines
appear... this did not work with Gem. (Tried with videoVL4.cpp)
After some surfing, my understanding as of now is that Gem is trying to
issue V4L functions, whereas my webcam driver only understands V4L2..
Is this so?
I would appreciate advise on insight on what could be happening here, or
even just workarounds to this case.
Here are some hardware specs I gathered, followed by the output of Gem
(or they could be from ioctl... I am new to V4L).
-- Output of v4l_dump (http://www.raphnet.net/programmation/v4l_tools/)
Using device /dev/video0
struct video_capability
{
name='Laptop_Integrated_Webcam_0.3M'
channels=1
audios=0
maxwidth=640
maxheight=480
minwidth=48
minheight=32
}
VIDIOCGCHAN: Invalid argument
struct video_picture
{
brightness=32768
hue=32768
colour=41942
contrast=0
whiteness=0
depth=16
palette=8
}
-- Pd main window output
[pix_video]: video driver 0: video4linux v4l // --- On object ctreation
verbose( 1):[pix_video]: device-err: 0// --- When sending [device
/dev/video0
verbose( 0):v4l: stopped Transfer
verbose( 1):v4l::startTransfer closing 6
-- Console output ( When sending [device /dev/video0 )
v4l: VDIOCGCHAN: Invalid argument
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
Thank you in advance..
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Re: [PD] pix_video, webcam issue on Linux
Wow Cyrille, that was right on the spot!
With the mentioned version of Ubuntu, first installing the libv4l-dev
package and then rebuilding Gem just like I did previously solved it all.
Thanks again!
--
David Shimamoto
it look like the Gem your using is not compiled with v4l2 suport.
i have somthing like this when creating pix_video : [pix_video]: video
driver 0: video4linux2 v4l2 [pix_video]: video driver 1: video4linux v4l
[pix_video]: video driver 2: ieee1394 dv4l dv
so, for me V4L2 is default.
i think you have to upgrade gem to a version that suport v4l2 in order
to use v4l2 devices...
Cyrille
PSPunch a écrit :
Hi all,
This may not be specific to Pd/Gem..
I have a webcam I am trying to get working with [pix_video] in the
following environment.
- Ubuntu Studio 9.04,
- Pd-extended 0.41.4 (.deb for the above distro)
- Gem 0.92.2
The camera works fine with Skype for Linux and v4l-test.
However, when specifying the device with [pix_video], I get a series of
errors such as,
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
I've seen posts on this list related to similar errors, in the case of
pdp, with advise to bypass the conditional jumps near where the defines
appear... this did not work with Gem. (Tried with videoVL4.cpp)
After some surfing, my understanding as of now is that Gem is trying to
issue V4L functions, whereas my webcam driver only understands V4L2..
Is this so?
I would appreciate advise on insight on what could be happening here, or
even just workarounds to this case.
Here are some hardware specs I gathered, followed by the output of Gem
(or they could be from ioctl... I am new to V4L).
-- Output of v4l_dump (http://www.raphnet.net/programmation/v4l_tools/)
Using device /dev/video0
struct video_capability
{
name='Laptop_Integrated_Webcam_0.3M'
channels=1
audios=0
maxwidth=640
maxheight=480
minwidth=48
minheight=32
}
VIDIOCGCHAN: Invalid argument
struct video_picture
{
brightness=32768
hue=32768
colour=41942
contrast=0
whiteness=0
depth=16
palette=8
}
-- Pd main window output
[pix_video]: video driver 0: video4linux v4l // --- On object ctreation
verbose( 1):[pix_video]: device-err: 0 // --- When sending [device
/dev/video0
verbose( 0):v4l: stopped Transfer
verbose( 1):v4l::startTransfer closing 6
-- Console output ( When sending [device /dev/video0 )
v4l: VDIOCGCHAN: Invalid argument
v4l: VDIOCGCHAN: Invalid argument
v4l: VIDIOCGMBUF: Invalid argument
Thank you in advance..
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