just to conclude with this monologue : in fact, i had 2 problem in the same time : -there is a bug somewhere (in the driver) that make the video to crash when 2 webcam IN THE SAME USB BUS are used in the same time. if the webcams are not pluged on the same usb bus, then it's ok.
-the other problem is still a bit mysterious, but it appear when 2 [pix_video] try to access the /dev/video0 device. This is the default behaviour of pix_video. This is why compiling V4L2 support solve this problem. for now, i just change the link /dev/video0 -> /dev/video_0 so gem can't find the video0. selecting the correct device later is then working. i don't really know, butthis is maybe also a driver problem.
cyrille
cyrille henry a écrit :
hello, i find somthing interesting : i compile Gem with flag : --with-v4l2 and now i don't have anymore problem with v4l V4L2 work also, but there are some bug. i'll digg them when i'll have more time.
so, there is probably a bug somewhere in pix_video, but compiling with v4l2 solve it...
cyrille
cyrille henry a écrit :
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
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