[GEM-dev] dimen problem with 2 pix_video object

[cyrille henry]

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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