[PD] pix_video, webcam issue on Linux

[cyrille henry]

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..
>