[GEM-dev] dimen problem with 2 pix_video object

[cyrille henry]

hello,
i've got 2 philips webcam SPC900. i plan to use them in an installation.

there as been some discution on this list about this webcam in september.

i've got a diferent problem that is introduced only using 2 of this camera in the same time.


i made a simple test patch that just have 2 pix_video, and a message "device 1" and "device 2" 
(device 0 is my internal webcam)



the problem is : 

send device 1 to the 1st pix_video -> ok
send dimen 640x480 to the 1st pix_video -> ok
send device 2 to the 2nd pix_video -> ok
send dimen 640x480 o the 2nd pix_video -> the video stay black but every other thing work.
sending a device 0, or removing the 2nd pix_video make everything to stop and i have to manually kill pd


changing order give the about the same result : 
send device 1 to the 1st pix_video -> ok
send device 2 to the 2nd pix_video -> ok
send dimen 640x480 o the 2nd pix_video -> the video stay black but every other thing work.
send dimen 640x480 to the 1st pix_video -> ok


send device 2 to the 2nd pix_video -> ok
send device 1 to the 1st pix_video -> ok
send dimen 640x480 o the 2nd pix_video -> the video stay black but every other thing work.
send dimen 640x480 to the 1st pix_video -> ok


send device 2 to the 2nd pix_video -> ok
send dimen 640x480 o the 2nd pix_video -> ok
send device 1 to the 1st pix_video -> the video stay black but every other thing work.


what i call : 1st pix_video, is the 1st to be rendered.



i tied to store the image size in the memory of the cam with the setpwc tools, in order to test Iohannes patch to restore setting.
but i've got 2 problems : 
	-setpwc does not work for saving and restoring data in the non volatil ram (Roman : it was working for you : do you hae an ida why it's not working here?)
	-just like Roman, i've got black frames when using iohannes patch. (i don't know if it's important but this black frame disapear when i change size of the video)


so, i can't have 2 of this webcam at a good quality on the same time, and it's a major problem for my installation.


i also try to use them in 2 diferents pd on the same time, and i've got the same problem. 
if i use my internal webcam + an external one, then everything work.


so, i suspect a driver problem, and don't know if a solution could be find.
what do you think?


if it's a driver problem, then i'll certainly have to buy another webcam.
does anyone have a recommandation to make, for a linux compatible webcam?

thanks
Cyrille