Re: [Spca50x-devs] Accessing Philips SPC200NC at wrong resolution(?) leads to system crash

[michel Xhaard <mxhaard@xxxxxxx>]

Le Vendredi 7 Avril 2006 13:01, Bjoern Hinrichs a écrit :
> Hi!
>
> Since I'm new here: Thanks to all involved creating the driver. I just
> got my webcam yesterday and thanks to your effort I got it working
> almost straight out of the box. Unfortunately, I'm encountering a
> problem I couldn't find in the FAQ nor the archives of the mailing list.
>
> I'm running a Philips SPC200NC Vimicro PAS106 webcam under Linux 2.6.16
> using spca5xx 00.57.11.
>
> modprobeing the driver finds the webcam and recognizes its abilities:
> | [spca5xx_getcapability:2198] maxw 352 maxh 288 minw 176 minh 144
>
> spcaview claims a higher resolution as being available:
> | **************** PROBING CAMERA *********************
> | Camera found: Philips SPC200NC
> | Bridge found: ZC301-2
> | Bridge find ZC301-2 number 13
> | StreamId: JPEG Camera
> | quality 1 autoexpo 1 Timeframe 0
> | Bridge find ZC301-2 number 13
> | Available Resolutions width 640  heigth 480 native
> | Available Resolutions width 352  heigth 288 decoded
> | Available Resolutions width 320  heigth 240 native *
> | Available Resolutions width 176  heigth 144 decoded
> | *****************************************************
>
> Of course, running spcaview with -s 640x480 doesn't work but delivers an
> ugly green picture and lots of "VIDIOCMCAPTURE: requested dimensions too
> big" messages to syslog -- no surprise there, since 352x288 is the maximum
> resolution of the webcam.
>
> My problem is with other applications (tested with camorama and mplayer)
> accessing the cam at 640x480: this inevitably leads to a system freeze
> where the system isn't even responding to a ping from the outside.
> Unplugging the cam doesn't help.
>
> (At least I *think* the freezes occur because of accessing the cam at
> that resolution -- I've only tested it a couple of times  after I had
> the suspicion that that's the reason.)
>
> I don't get any syslog entries from these freezes, so this doesn't help
> at all.
>
> Again, I do know that 640x480 is more than the webcam can handle, but
> seeing the system freeze because of a typing error is something that
> doesn't really make me happy -- especially since I sometimes let other
> people use this computer.
>
> Any hints on what I can do to avoid situations like that in the future?
> If you need more info, please just drop me a line.
>
> Any help appreciated,
> Bjoern
>
> PS: I also crosschecked against Linux 2.6.15 and spca5xx 00.57.10.
Bjoern,
This is a bug in spcaview i need to update. Spc200nc code is experimental 
and should only works in 352x288 . I don't know how Philips can get so strange 
result with a zc0301 and a pas106 but it is. At the moment, i did not get 
crash on my Box, but the spca200nc need to be opened twice to start. 
Others application should only see the getcapabilities limit and then should 
never ask for 640x480.
 the problem is i have only two hands and one brain :)
I have to  setup V4L2 for July, here is my urgency.
regards
-- 
Michel Xhaard
http://mxhaard.free.fr


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