[PD] pix_video, webcam issue on Linux

[PSPunch]

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..
>>
>