Bug#647535: cheese: Wrong colours and artefacts on image

[Faidon Liambotis]

On Thu, Nov 03, 2011 at 04:56:19PM +0000, Jonathan McCrohan wrote:
> Cheese does not display the image from my Logitech E2500
> (idVendor=046d, idProduct=089d) webcam correctly.
> 
> The image is correctly displayed in other applications such as VLC,
> guvcview and the Google Talk Plugin.
> 
> I believe the same bug has also been found in Ubuntu [1].
> 
> [1] https://bugs.launchpad.net/ubuntu/+source/cheese/+bug/838739

I'm also experiencing this bug. One of the suggestions in the Ubuntu bug
report was to try a libv4l-0 from a libv4l PPA and that indeed solved
the problem for me too.

I then went to compare the PPA's libv4l with the Debian one; to my
surprise, the source packages were (almost) identical. After having a
closer look, it seems that the Debian package (and, presumably, Ubuntu's
Oneiric binaries) are built against libjpeg8, while the PPA one against
libjpeg62.

It seems that libv4lconvert uses libjpeg and the libjpeg62->libjpeg8
transition messed it up. I have no idea, however, if it's libjpeg8's
fault or if the callers (libv4lconvert? cheese?) are misusing it, esp.
since the bug seems to affect some applications and not others (like
gstreamer-properties) and only at certain resolutions.

Therefore, I'm just Cc'ing all the relevant maintainers and hope that
you work it out :-)

Best regards,
Faidon