[HOW-TO] Upside-down image from UVC webcam

[HansdeGoede]

Hello,

I've just got one of these netbooks with a built-in webcamera. I've also found out that the image is rotated 180 degrees and tried to re-compile libv4l to fix this. I've found that the way to go is to include the vendor and model information in the source of libv4lconvert/libv4lconvert.c. I would be very thankful if someone would teach me how to extract the necessary info from the output of lsusb and dmidecode.

The webcamera is listed as

ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC WebCam / CNF7129

. Does anybody know whether this has been added to the newest/trunk/mercurial libv4l?

TIA

Hi,

Just do (as root):
lsusb > lsusb.log
dmidecode > dmi.log

And send me <hdegoede@redhat.com>, a mail with these 2 files attached. Do *NOT* copy and paste them I need them 100% unmodified.

I'll then add your laptop to libv4l's upside down table and get back to you with testing instructions.

Regards,

Hans

[gotaserena]

Hi Hans, I've just sent you the files. Thank you very much!

[thematrixuum]

I'm having problem to patch the file. Do I have to rename the file to .patch file? Because I am stuck here :

patch < patch_solution1_mirrored.txt 
The program 'patch' is currently not installed.  You can install it by typing:
sudo apt-get install patch
patch: command not found

Anything I done wrong?

BTW, I'm a noob.. Only a four day experience in Linux and Ubuntu..

[paalfe]

Is this still the best/only solution to fix Upside-down image from UVC webcam running ubuntu 9.10?

what happens with the fix when kernel or packages is updated?
Do I have to do the fix again then?

[paalfe]

Found this fine solution and wanted to share it:

http://radu.cotescu.com/2009/11/05/f...-ubuntu-webcam

quick howto:

sudo add-apt-repository ppa:libv4l
sudo aptitude update && sudo aptitude install gtk-v4l libv4l-0

If ubuntu 32bit, do:

sudo su
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper
chmod +x /bin/webcamWrapper
exit

If ubuntu 32bit, you can now run programs like this to fix webcam upside-down image:

webcamWrapper skype
webcamWrapper amsn

If ubuntu 64bit, do:

sudo su
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib32/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper32
chmod +x /bin/webcamWrapper
chmod +x /bin/webcamWrapper32
exit

If ubuntu 64bit, you can now run programs like this to fix webcam upside-down image:

webcamWrapper32 skype
webcamWrapper amsn

[Random_Dude]

I've tried the solution in the first post and the one in the post above, none of them worked.

After my attempt with the first, my pc stopped detecting the camera. Then I opened synaptic and reinstalled almost everything that said video driver (and probably the kernel).
I rebooted and opened chesse, the image was no longer upside down, but skype still has that problem.

So 50% of my problem is fixed, does anyone know how to flip the image in skype?

[fakhri]

Found this fine solution and wanted to share it:

http://radu.cotescu.com/2009/11/05/f...-ubuntu-webcam

quick howto:

sudo add-apt-repository ppa:libv4l
sudo aptitude update && sudo aptitude install gtk-v4l libv4l-0

If ubuntu 32bit, do:

sudo su
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper
chmod +x /bin/webcamWrapper
exit

If ubuntu 32bit, you can now run programs like this to fix webcam upside-down image:

webcamWrapper skype
webcamWrapper amsn

If ubuntu 64bit, do:

sudo su
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper
echo -e '#!/bin/sh\nLD_PRELOAD=/usr/lib32/libv4l/v4l1compat.so $1\nexit 0' > /bin/webcamWrapper32
chmod +x /bin/webcamWrapper
chmod +x /bin/webcamWrapper32
exit

If ubuntu 64bit, you can now run programs like this to fix webcam upside-down image:

webcamWrapper32 skype
webcamWrapper amsn

it works it works!! The solution on the first post didn't work for me. I added a blank line at the end of the patch, yet it still came out with error.

I'm using karmic on ASUS K40IN. The uvc device id is 04f2:b071.

Thanks for the solution!!

[ItalOz]

Found this fine solution and wanted to share it:

the solution that paalfe has proposed

http://ubuntuforums.org/showthread.p...31#post8925031

worked perfectly on my wife's brand new ASUS K50IJ the webcam model after issuing

lsusb

is

Bus 001 Device 002: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC WebCam / CNF7129

I think this marks the end of horrible windows 7 in this laptop, when she bought it she was really pissed of how slow the system was with the new computer and that sometimes because windows wanted to install updates without asking (default behaviour) the computer hang for ages before actually turned off.

So I saw a chance and I went "how about jumping to linux dear?" so far...

Cheers to everybody

[Random_Dude]

Found this fine solution and wanted to share it:

http://radu.cotescu.com/2009/11/05/f...-ubuntu-webcam

My bad, this one works. I didn't made the last command.
It's much simpler than the one on the first post.

Thanks paalfe!

Cheers.

[drewVeidt]

Unfortunately, linking to the /usr/lib32/libv4l/v4l1compat.so just causes skype to segfault when i go to test the camera. I'm on a 64 bit Asus K52J. I didn't think that would matter since the 32 bit library is installed, but I guess it does.

I may be down to building uvcvideo myself, which seems like a pretty horrific option. Especially considering that the code is no longer hosted in the manner in which the solution publishes (it's over 2 years old and the codebase has been reorganized and relocated). If anybody has further advice on this, it'd be great. Otherwise I guess I'll just have to figure it out on my own and then share it so the next clown doesn't have to deal with it!

The only thing I know about the cam is that it is by "IMC Networks."