oneiric: "undefined symbol" errors, webcam doesn't work

[Andreas Hasenack]

amsn 0.98.4-0ubuntu2
oneiric
webcam microsoft VX-800 usb ID 045e:0766

When staring amsn up from the console, and then hitting "ctrl-n" to start the audio and video wizard and clicking next, the following errors are spit out:

andreas@duo:~$ amsn
dlopen: ./utils/linux/capture/libng/plugins/conv-mjpeg.so: undefined symbol: ng_debug
dlopen: ./utils/linux/capture/libng/plugins/drv0-v4l2.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/drv1-v4l.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/sn9c10x.so: undefined symbol: ng_conv_register

At the same time, the wizard says it couldn't locate a webcam.

The cam works with skype and cheese, and worked with amsn under Lucid. v4l-info also shows a bunch of info about it (attached).

I also tried amsn's "make check-capture" from the source tarball, but it throws the same "undefined symbol" errors and fails to list any video device.

Finally, I also tried rebuilding from source (0.98.4) and a svn daily, but got the same errors when running the test.tcl script.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Gianfranco Costamagna (costamagnagianfranco)]

Hi Kakaroto, seems to be the new amsn version has some broken plugins... Could you please take a look?

[kakaroto (kakaroto)]

@vivia looked at this and I think fixed it, I think it had something to do with the linker in the new version of ubuntu.

[vivia (vivia)]

.... no I didn't fix it... I looked at it together with Phil, we have a patch (he wrote it) that helps the situation a bit - at least the webcam gets recognized, but the image appears black with no brightness/contrast/etc volume controls whatsoever, and there are no error messages this time.

The patch is in http://pastie.org/private/nxv8vapdzbjp80e1ve4cka if you want to investigate.

19:53 <LePhilousophe> the main problem
19:53 <LePhilousophe> is that with new Ubuntu
19:54 <LePhilousophe> you need to set the .so from which you import symbols as
                      DT_NEEDED
19:54 <LePhilousophe> and for now we don't set that as we rely on the fact that
                      libng must be loaded to load plugins
19:54 <LePhilousophe> because that's libng which loads plugins

[Andreas Hasenack (ahasenack)]

Fixed where? I would like to try it.

I tried svn revision r12344 on oneiric (ubuntu 11.10) and that's the current revision still.

[Andreas Hasenack (ahasenack)]

I applied that patch to trunk and rebuilt, and now the camera is recognized and make check-capture works for me, as does ./amsn with the audio/video wizard.

[Most People Use Their Full Name here (fullname1)]

experiencing the same problem here
$ amsn
dlopen: ./utils/linux/capture/libng/plugins/conv-mjpeg.so: undefined symbol: ng_debug
dlopen: ./utils/linux/capture/libng/plugins/drv0-v4l2.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/drv1-v4l.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/sn9c10x.so: undefined symbol: ng_conv_register

amsn_0.98.4-0ubuntu3_armel

[Amrish Lakhisaran (amrish96)]

I have the same problem with my Logitech quickam pro (046d:0870)
ubuntu 11.10 with aMSN

dlopen: ./utils/linux/capture/libng/plugins/conv-mjpeg.so: undefined symbol: ng_debug
dlopen: ./utils/linux/capture/libng/plugins/drv0-v4l2.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/drv1-v4l.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/sn9c10x.so: undefined symbol: ng_conv_register

So.. How to fix this? How can I use the patch? (sorry for the noob question)

[Josep-Lluís Font-García (josep-lluis-font)]

Sorry if the post is not relevant, but we have the very same problem here.
My camera is (according to lsusb):

ID 046d:0990 Logitech, Inc. QuickCam Pro 9000

The errors are:

dlopen: ./utils/linux/capture/libng/plugins/conv-mjpeg.so: undefined symbol: ng_debug
dlopen: ./utils/linux/capture/libng/plugins/drv0-v4l2.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/drv1-v4l.so: undefined symbol: ng_dev
dlopen: ./utils/linux/capture/libng/plugins/sn9c10x.so: undefined symbol: ng_conv_register

cat /etc/lsb-release gives:

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"

uname -a gives:

Linux ubuntu 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:51:22 UTC 2012 i686 i686 i386 GNU/Linux

And the camera does not work at all with amsn.

[Gianfranco Costamagna (costamagnagianfranco)]

Hi Andreas.
Could you please try the new amsn 0.98.9-1 from my ppa [1]?
this version is available for precise and quantal and it contains so many bug fixes.
If this doesn't fix the problem set the status back to new
[1] https://code.launchpad.net/~costamagnagianfranco/+archive/amsn

[Andreas Hasenack (ahasenack)]

I downloaded the source tarball 0.98.9 and built locally, the camera works now, thanks.