[GEM-dev] uvc webcam (eee pc 900 built in) with pix_video?

[cyrille henry]

did you install libv4l-dev?
i think it's your problem...

c


ben at ekran.org a écrit :
> Thanks Cyrille.
> 
> I got a fresh checkout from svn thinking maybe some configure issue was
> there. Very interestingly I am getting different pix_video outputs on
> instantiation:
> 
> video driver 0: video4linux
> 
> no videot4linux2
> 
> This is after doing this on a fresh co:
> 
> aclocal && autoconf && ./configure --prefix=/usr && make
> 
> I'm confused...
> 
> Ah, well configure tells me whats up:
> 
> checking for PKG_LIBV4L1_CFLAGS...
> checking for PKG_LIBV4L1_LIBS...
> checking for libv4l1-config... no
> checking for v4l1_open in -llibv4l1... no
> checking for PKG_LIBV4L2_CFLAGS...
> checking for PKG_LIBV4L2_LIBS...
> checking for libv4l2-config... no
> checking for v4l2_open in -llibv4l2... no
> 
> hmmm...
> 
> apt-get install --reinstall libv4l-0
> 
> does not make a difference.
> 
> seems gcc agrees:
> 
> gcc -llibv4l2
> /usr/bin/ld: cannot find -llibv4l2
> 
> ummmm..
> 
> file /usr/lib/libv4l2.so.0
> /usr/lib/libv4l2.so.0: ELF 32-bit LSB shared object, Intel 80386, version
> 1 (SYSV), dynamically linked, stripped
> 
> I'm lost... but seems like little to do with Gem. I'll look into v4l
> issues on intrepid.
> 
> Thanks all for trying.
> 
> .b.
> 
>> hello Ben,
>>
>> i don't have a eee, but i do have exactely the same camera on my laptop.
>>
>> my ./configure output somthing like this :
>>     use v4l              : yes (libv4l)
>>
>> using ubuntu 8.10 (intrepid) and the same version than your of libv4l.
>>
>> when creating a pix_video object, i've got in the pd log :
>> video driver 0: video4linux2
>> video driver 1: video4linux
>> video driver 2: ieee1394 for linux
>>
>> pix_video help patch is working out of the box.
>>
>> i can't understand why it's not working for you.
>>
>> Cyrille
>>
>> ben at ekran.org a écrit :
>>> Thanks Johannes.
>>>
>>> I tried a straight:
>>>
>>> svn update && svn revert . && aclocal && autoconf && ./configure && make
>>>
>>> same issue.
>>>
>>> I've attached the webcam lsusb -v info, maybe the 901 has a different
>>> camera?
>>>
>>> I'm linking with libv4l-0 0.5.7-1~intrepid1
>>>
>>> Let me know if you have any ideas, otherwise I'll leave this off the
>>> demo
>>> list.
>>>
>>> Thanks all.
>>> .b.
>>>
>>>> Ivica Ico Bukvic wrote:
>>>>
>>>>> Gem. IIRC when I was inquiring about this the last time I think the
>>>>> reply
>>>>> was that currently v4l2 is not supported well under Gem (although
>>>>> please
>>>>> take this with a boulder of salt as this has been a while ago).
>>>> this has changed with the advent of libv4l (which is now in debian)
>>>>
>>>> at least here on my eepc 901 the camera works out of the box with Gem
>>>> (no special configure tweaks needed)
>>>>
>>>>
>>>>>> I'm working with an svn copy of GEM updated yesterday. I'm
>>>>>> configuring
>>>>>> with:
>>>>>>
>>>>>> ./configure --prefix=/usr --without-libv4l1
>>>>>> --with-libv4l2-libs=/usr/lib/
>>>>>> --with-libv4l2-includes=/usr/include/
>>>> see above: no special switches should be needed (if libv4l is
>>>> installed)
>>>>
>>>>>> and GEM complains about the camera when I start pix_video (and I get
>>>>>> no
>>>>>> video image):
>>>>>>
>>>>>> v4l: VDIOCGCHAN: Invalid argument
>>>>>>
>>>>>> This device/camera must only have one channel?
>>>> yes, but how is Gem supposed to know?
>>>> anyhow, it shouldn't really matter, as the driver will either ignore
>>>> the
>>>>   channel-change request or you could set it to "channel 0".
>>>>
>>>>>> I can't tell if I'm using v4l1 or 2. configure tells me v4l: yes not
>>>>>> matter if its v4l1 or v4l2 I enable. I also have a vague memory that
>>>>>> configure should tell me what v4l its using, like:
>>>>>>
>>>>>> v4l: yes (libv4l2)
>>>> your memory might be correct, but the world moves on and
>>>> configure-scripts get updated.
>>>>
>>>> i'll check back on my eee which version of libv4l i'm using.
>>>>
>>>> fgamsdr
>>>> IOhannes
>>>>
>>>>
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>>>>
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> 
> 
> 
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