Hi Laurent,
My reply to Paulo a few days ago did not make it to the list (forgot
again I need to 'reply all' or at least check if I send to the list).
What I did is reinstall of the system, since it became a bit of a mess.
My error started by installing uvcvideo-dev over the original one that
came with lenny. And then making some mess with installing/unstalling
e.g. different modules. Uvcvideo was not the problem, just the way i
thought I needed to stream video. Now using gstreamer all works well.
Thanks!
Bart
On 03/09/2010 12:07 PM, Laurent Pinchart wrote:
Hi Bart,
On Friday 05 March 2010 23:28:22 Bart Koppe wrote:
(sorry for my empty reply just before this one)
Hi Paulo,
I got vloopback running in the first place with this link. I remember
insmod did not work, but 'make install' and then 'modprobe vloopback'
did. So I didn't bother with it, untill after installing uvc-video it
stopped working.
Maybe i got the same message as now, but i don't remember.
# insmod vloopback.ko
insmod: error inserting 'vloopback.ko': -1 Unknown symbol in module
In the readme of vloopback they mention this error and the solution:
Solution : You must load videodev module :
'insmod videodev ; insmod ./vloopback.ko'
Also they mention:
To compile and install :
make ; su - ; make install
/sbin/modprobe videodev
/sbin/modprobe vloopback
But I now don't have videodev and it is not included in
svn co http://www.lavrsen.dk/svn/vloopback/trunk/ vloopback
The videodev.ko module provides the V4L2 core. If you're running a distro
kernel the module was shipped with your kernel.
For backward-compatibility reasons (to make the latest driver work on older
kernels), the uvcvideo driver ships with a copy of the whole V4L2 subsystem
source. When installing the uvcvideo module, you've also installed the latest
version of the V4L2 core and other V4L2 drivers.
Basically I have no clue why it ever worked, I had no videodev module
installed unless it came with another software package, could that be?
I also remember having videdodev in the last few days, so maybe somehow
I removed it.. I guess installed uvc-version over it, and then with
'make rminstall' i deleted it. Does that make sense?
It could make sense yes.
Trying to install the uvc-video version of videodev (I already ran 'make
minstall', then 'make') I get:
# insmod v4l/videodev.ko
insmod: error inserting 'v4l/videodev.ko': -1 Unknown symbol in module
This kind of message is caused by incompatibilities between driver versions.
Basically, the videodev.ko module you're trying to load depends on other
modules, but the version of those modules that are already loaded came from
your distro and are not recent enough.
To solve this problem, you need to either:
- install the V4L2 subsystem that comes with uvcvideo, replacing the one that
came with your distro (you might need to remove the distro one manually, as
the new one might probably installs in a new location), or
- load all the required V4L2 modules in order using insmod (in this case you
would need to load v4l/v4l2-compat-ioctl32.ko before loading v4l/videodev.ko).
The first solution is easier.
When i run just 'make install' as in the uvc-video readme, it installs
and I can 'modprobe videodev'.
Then back to my vloopback source and
# insmod vloopback.ko
insmod: error inserting 'vloopback.ko': -1 Unknown symbol in module
This is because the vloopback.ko module has been compiled against your kernel
distro, while the loaded videodev.ko module came with uvcvideo and is more
recent.
When I do 'make install' instead of insmod I get the same old error again
# modprobe vloopback
FATAL: Error inserting vloopback
(/lib/modules/2.6.26-2-686/kernel/drivers/misc/vloopback.ko): Unknown
symbol in module, or unknown parameter (see dmesg)
Any idea?
To solve your problem, you need to recompile vloopback against the uvcvideo
tree.
--
-----/\/\/\/\/\/\-----
Bart Koppe
Franselaan 232C
3028 AP Rotterdam
06-40704051
b...@a-bort.org
aim/msn/skype bartkoppe
http://a-bort.org
-----\/\/\/\/\/\/-----
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