Comments on: GL860: more devices, colour images

By: O Lorin

O Lorin — Thu, 10 Apr 2008 23:22:37 +0000

Lastest news : 800×600 and 1280×960 aren’t only verticaly flipped, they are also horinzontaly flipped. My webcam isn’t able to do 160×120, 320×240, 1024×768, under 640×480 the frames are in 640×480, this is the viewer which to do the size reduction. The same for 1024×768 which is a to-be-reduced 1280×960. Maybe it’s the same for your model, three real image size.
I control also the luminosity, light source and retrolighting of the cam. These three parameters are obviously part of the initialization sequence. Often these commands are sent twice. I’ll try other feature and try to see if these infos are received during an initialization sequence.

By: Sur3

Sur3 — Thu, 10 Apr 2008 22:06:54 +0000

thanks, i will check it out.

By: O Lorin

O Lorin — Thu, 10 Apr 2008 17:17:41 +0000

In changing.log, there is some images but some important part of the traffic is lost. Maybe the logging by sniffusb takes too many times and data are lost. A lot of End-Of-Image markers are lost, this may be why amcap doesn’t succeed in showing any image. Here is the program I use to study your log : http://sharefiles.us/download.php?id=BB78BD2D1 (just make “relog file.log”). It try also to write the images in the log.

By: Sur3

Sur3 — Thu, 10 Apr 2008 09:01:08 +0000

ok i did some more usbsniffing…
this is the log from activating the webcam in the device manager:
http://131.234.130.200/neuron/gentoo/usb_05e3_0503/aktivieren.log
and this is amcap:
http://131.234.130.200/neuron/gentoo/usb_05e3_0503/amcap.log
and finally amcap with changing the size and format of the images:
http://131.234.130.200/neuron/gentoo/usb_05e3_0503/changing.log
but i dont see any pictures in amcap, when usbsnoop is installed…

also i recognised, that i can choose between I420 (standard), RGB and YUY2, with YUY2 i can select a maximum image-size of 1600×1200 but with I420 and RGB only 640×480

By: O Lorin

O Lorin — Thu, 10 Apr 2008 02:35:52 +0000

Lastest news : I can see the video in 640×480, 800×600 and 1280×960. In both biggest sizes, the image is verticaly flipped…

By: Patrick

Patrick — Wed, 09 Apr 2008 14:22:20 +0000

:-)

Finally got something with the capture_x11 program. Also disabled do_init().

Image is:
- black-white
- and upside-down
- Right-top corner only. Have not tried to see what percentage of the screen.

Patrick

By: Sur3

Sur3 — Wed, 09 Apr 2008 09:25:29 +0000

…and i think this is a feature and not a bug: “no, i’ m not recording… lalalaa” :-D

By: Sur3

Sur3 — Wed, 09 Apr 2008 09:23:44 +0000

hehe, what a strange hack, when i suppress the do_init, then the i see quiet the same pictures as with it, but the light of my camera doesn’t turn on at all.

By: O Lorin

O Lorin — Wed, 09 Apr 2008 02:36:25 +0000

Some good news for my cam: the initialization sequence isn’t usefull. I made sniffings while changing the image size and most of the traffic during the modification equals the initialization sequence. So I suppress the do_init function
and it works perfectly. This is pertinent as the light of my cam switch off and switch on later when I use capture_to_files. I’ll study what are the minor changes in the sequences.

By: Sur3

Sur3 — Wed, 09 Apr 2008 00:39:55 +0000

@dsd
i just can reduce the image size in amcap, but perhabs i’m blind, perhaps i’ll search for it tomorrow…

@O Lorin
yes, it was really dark and as i interpret the data from capture_to_file right my camera needs about 10 pictures before you can see anything usefull.

@*
well as i mentioned i experimented a bit with the capture_to_file and recognised, that the picture slowly fades-in from the earlier mentioned ( http://homepages.uni-paderborn.de/neuron/pix/cap09.pgm ), so after about 40 pictures i get an “normal” (ok not really normal) image in a strage format/color-coding, but it still moves and is just a corner.

thanks&greets
Simon