In case it helps, the errors come from mainloop_v4l2 opencv's function:
1160 static void mainloop_v4l2(CvCaptureCAM_V4L* capture)
1161 {
1162 unsigned int count;
1163
1164 count = 1;
1165
1166 while (count-- > 0) {
1167 for (;;) {
1168 fd_set fds;
1169 struct timeval tv;
1170 int r;
1171
1172 FD_ZERO (&fds);
1173 FD_SET (capture->deviceHandle, &fds);
1174
1175 /* Timeout. */
1176 tv.tv_sec = 2;
1177 tv.tv_usec = 0;
1178
1179 r = select (capture->deviceHandle+1, &fds,
NULL, NULL, &tv);
1180
1181 if (-1 == r) {
1182 if (EINTR == errno)
1183 continue;
1184
1185 errno_exit ("select");
1186 }
1187
1188 if (0 == r) {
1189 fprintf (stderr, "select
timeout\n");
1190 // exit (EXIT_FAILURE);
1191 }
1192
1193 if (read_frame_v4l2 (capture))
1194 break;
1195
1196 /* EAGAIN - continue select loop. */
1197 }
1198 }
1199 }
On 1/9/07, Jose Luis Landabaso <[EMAIL PROTECTED]> wrote:
Laurent, Martin, others,
I have arrived to a point in which I'm very confused.
I have learnt that you can only turn off the color processing when the
camera is not capturing.
So, I stop the capture program, and then run bayer.
If I disable color processing I cannot run my capture program again
since. I always get:
select timeout
VIDIOC_DQBUF error 11, Resource temporarily unavailable
When I turn again the video processing on then the program works fine
again.
Any ideas?
On 1/8/07, Laurent Pinchart <[EMAIL PROTECTED]> wrote:
>
> Hi Jose,
>
> > Hi Martin Rubli and others!
> >
> > First, let me thank you for the work done so far in the driver!
>
> As the project leader, let me thank you :-)
>
> > The thing is that I am trying to disable the camera auto gain.
> > I have read some previous threads that treated this same topic, but
> haven't
> > succeeded so far. I applied the patch that Martin Rubli made
> available. I
> > then compliled and installed. Later, I compiled the " bayer.c" file.
> >
> > I am using a Logitech Ultra Vision camera and opencv and works pretty
> ok,
> > but when I run the bayer program I get:
> >
> > sudo ./bayer /dev/video0 0
> > Device /dev/video0 opened: USB Video Class device.
> > Enabling color pipeline ...
> > ERROR: Unable to set device control: -1
> >
> > From what I understand, the idea is to change the camera behaviour in
> > run-time, isn't it? I mean, I can tell the camera to stop doing
> > auto-adjustments (gain, shutter, whatever) anytime. Can this be
> achieved?
>
> That's right. The Quickcam Ultra Vision might have slightly different
> controls. I have no such model here, so I can't test the patch. Maybe
> Martin
> could have a look.
>
> Martin, by the way, is it necessary to put the webcam in bayer mode to
> disable
> the auto-exposure ? Or would the auto-exposure mode control do the job
> alone ?
>
> Cheers,
>
> Laurent Pinchart
>
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