Comments on: Flipped images from your webcam in Ubuntu?

By: johnfrost

johnfrost — Tue, 20 Jul 2010 09:05:38 +0000

Q:
Did it work okay in your XP vm before using libv4l on your Ubuntu host?
A:
No, it did not work in XP as long as it is running under VM,
Q:
In Windows the problem was corrected by performing the flip in the drivers. Are they installed in your virtual machine
A:
Yes, drivers where installed.

I guess accessing the camera is through software

By: johnfrost

johnfrost — Tue, 20 Jul 2010 08:59:58 +0000

Q:
Did it work okay in your XP vm before using libv4l on your Ubuntu host?
A: no
Q:
In Windows the problem was corrected by performing the flip in the drivers. Are they installed in your virtual machine?
A: Yes drivers are installed in WinXP running under VM

I guess accessing the camera is via software.

By: Radu

Radu — Tue, 20 Jul 2010 08:27:04 +0000

Did it work okay in your XP vm before using libv4l on your Ubuntu host? In Windows the problem was corrected by performing the flip in the drivers. Are they installed in your virtual machine? I'm not sure how the guest is accessing the camera from your host: direct-to-hardware or via a software abstract layer which passes through libv4l, in which case the XP drivers won't help since they are flipping the correct oriented image.

By: johnfrost

johnfrost — Tue, 20 Jul 2010 08:04:38 +0000

Hello Radu,

I want to thank you for a very nice explanation and it did really work. However i have a bit of situation here. I have a Sun VirtualBox installed in my machine and I’m running winxp virtually. The problem is when ever i use the webcam in winxp virtually running under virtualbox, still i face the same problem.

By: Gaétan Martineau

Gaétan Martineau — Mon, 28 Jun 2010 17:22:46 +0000

We now got a 404 error trying to install the above fix, as in;

…http://ppa.launchpad.net/libv4l/ppa/ubuntu/dists/isadora/main/binary-i386/Packages.gz
Resolving ppa.launchpad.net… 91.189.90.217
Connecting to ppa.launchpad.net|91.189.90.217|:80… connected.
HTTP request sent, awaiting response… 404 Not Found
2010-06-28 13:17:18 ERROR 404: Not Found.

… led into a dead-end, unfortunately.

By: Rewind

Rewind — Sun, 27 Jun 2010 19:49:27 +0000

Yep, I suppose so. I can’t find anything written about Suyin Corp. Tried to send mail with lsusb.log and dmi.log to Hans, but can’t open it from your posting nor find his email. The files are here:
http://www.codeupload.com/627 – lsusb.log
http://www.codeupload.com/628 – dmi.log
Thanks again for the reply. I guess I’ll have to wait the next release

By: Radu

Radu — Sun, 27 Jun 2010 18:45:44 +0000

@Rewind: If you don’t see any error messages when you launch your apps it’s highly probable that your webcam is not included in libv4l.

By: Rewind

Rewind — Sun, 27 Jun 2010 16:13:35 +0000

Radu, thanks for your latest comment, the article made clear and helped me to resolve the following error:

ERROR: ld.so: object '/usr/lib/libv4l/v4l1compat.so' from LD_PRELOAD cannot be preloaded: ignored.

but still the cam image is upside down, may be I have to send the logs from lsusb and dmi to help further development. The camera is

064e:a116 Suyin Corp.

By: Anonymous

Anonymous — Sun, 06 Jun 2010 21:51:36 +0000

Washburn,

Thanks for that fix with adding the lines “export LIBV4LCONTROL_FLAGS=3″. My system is Ubuntu 9.10 on an ASUS G50vt-x5. Nothing worked except your solution.

Cheers.

By: Radu

Radu — Wed, 28 Apr 2010 16:22:18 +0000

Hans has a great explanatory article here.