Cédric,
I think I failed to see the obvious.
Make sure your camera is connected to a USB2 hub.
Logitech cameras (and maybe all uvc devices) cut down available resolutions
when pluged to a slower USB1 pipe.
Best regards,
Paulo
2009/3/19 <lesc...@esiee.fr>
> Paulo,
>
>
> Here what I have from "luvcview -L":
>
> luvcview version 0.2.1
> Video driver: x11
> A window manager is available
> video /dev/video0
> /dev/video0 does not support read i/o
> { pixelformat = 'MJPG', description = 'MJPEG' }
> { discrete: width = 160, height = 120 }
> Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
> { discrete: width = 176, height = 144 }
> Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
> { discrete: width = 320, height = 240 }
> Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
> { discrete: width = 352, height = 288 }
> Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
> { discrete: width = 640, height = 480 }
> Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
> { discrete: width = 800, height = 600 }
> Time interval between frame: 1/15, 1/10, 1/5,
> { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' }
> { discrete: width = 160, height = 120 }
> Time interval between frame: 1/15, 1/10, 1/5,
> { discrete: width = 176, height = 144 }
> Time interval between frame: 1/15, 1/10, 1/5,
>
>
> Does it mean I can't make it work under Linux? I know the webcam can go
> till 1600x1200 under MS Window with Logitech owner's drivers...
> Is there anything I could modify or configure to work it out?
>
>
> Regards,
>
>
> Cédric Lescop
>
>
>
>
> On Thu, March 19, 2009 16:03, Paulo Assis wrote:
> > Cédric,
> > Have you tried listing the device formats:
> > use "luvcview -L" or "guvcview --verbose" any of these commands should
> > print a list of available formats for your device
> >
> > Best regards,
> > Paulo
> >
> >
> > lesc...@esiee.fr escreveu:
> >> Hi Paulo,
> >>
> >>
> >>
> >> I inserted you code into mine. I set:
> >> formatIn = V4L2_PIX_FMT_YUYV width = 640 height = 480 fps = 30
> >>
> >> The result is:
> >> "Requested Format unavailable: get width 176 height 144"
> >>
> >>
> >> Like I usually got :(
> >> Thank you for trying to help me anyway,
> >>
> >>
> >>
> >> Cédric Lescop
> >>
> >>
> >>
> >>
> >> On Thu, March 19, 2009 10:25, Paulo Assis wrote:
> >>
> >>
> >>> Cédric Hi,
> >>> Could you pleaser try the following function, you will have to make
> >>> the necessary adaptations to your code.
> >>>
> >>>
> >>> int set_format(int fd, int formatIn, int width, int height, int fps)
> >>> {
> >>> struct v4l2_format fmt; struct v4l2_streamparm streamparm; int ret=0;
> >>>
> >>> // set format
> >>> fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.width = width;
> >>> fmt.fmt.pix.height = height; fmt.fmt.pix.pixelformat = formatIn;
> >>> fmt.fmt.pix.field = V4L2_FIELD_ANY;
> >>>
> >>> ret = ioctl(fd, VIDIOC_S_FMT, &fmt); if (ret < 0) { fprintf(stderr,
> >>> "VIDIOC_S_FORMAT - Unable to set format\n"); return (-1); }
> >>> if ((fmt.fmt.pix.width != width) || (fmt.fmt.pix.height != height)) {
> >>> fprintf(stderr, "Requested Format unavailable: get width %d height %d
> >>> \n",
> >>> fmt.fmt.pix.width, fmt.fmt.pix.height); return(-2); }
> >>>
> >>>
> >>> streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> >>> streamparm.parm.capture.timeperframe.numerator = 1;
> >>> streamparm.parm.capture.timeperframe.denominator = fps; ret =
> >>> ioctl(fd,VIDIOC_S_PARM, &streamparm); if (ret < 0) { fprintf(stderr,
> >>> "VIDIOC_S_PARM error\n"); return (-3); }
> >>> return (0); }
> >>>
> >>>
> >>> Best regards,
> >>> Paulo
> >>>
> >>>
> >>>
> >>> lesc...@esiee.fr escreveu:
> >>>
> >>>> Hi,
> >>>>
> >>>>
> >>>>
> >>>> This is my problem, I don't have any errors. V4L2 API says that
> >>>> when you ask for a Width and Heigth, the driver will give you the
> >>>> max ones below the values you asked for. Meaning if you ask for
> >>>> 817x616, it will
> >>>> set 800x600 without returning any errors.
> >>>>
> >>>>
> >>>>
> >>>> My DMESG (no pb, I have got my "/dev/video0"):
> >>>>
> >>>>
> >>>>
> >>>> usb 1-2: new full speed USB device using ohci_hcd and address 3 usb
> >>>> 1-2:
> >>>> configuration #1 chosen from 1 choice uvcvideo: Found UVC 1.00
> >>>> device <unnamed> (046d:0991)
> >>>> input: UVC Camera (046d:0991) as
> >>>> /devices/pci0000:00/0000:00:02.2/usb1/1-2/1-2:1.0/input/input9
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> An extract of my code, taken from the web (Capture.c):
> >>>>
> >>>>
> >>>>
> >>>> CLEAR (fmt);
> >>>>
> >>>>
> >>>>
> >>>> fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl (fd,
> >>>> VIDIOC_G_FMT, &fmt))
> >>>> errno_exit ("VIDIOC_G_FMT");
> >>>>
> >>>> fmt.fmt.pix.width = WB_FRAME_WIDTH; // 800
> >>>> fmt.fmt.pix.height = WB_FRAME_HEIGHT; // 600
> >>>> fmt.fmt.pix.pixelformat = WB_COLOR_FORMAT; // YUYV which is perfect
> >>>> for me fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
> >>>>
> >>>> // Note VIDIOC_S_FMT may change width and height
> >>>> // So I check the *new* values
> >>>>
> >>>>
> >>>>
> >>>> fprintf (stderr, "width: %d\n" "height: %d\n",
> >>>> fmt.fmt.pix.width, fmt.fmt.pix.height);
> >>>>
> >>>>
> >>>> It prints 176 by 144! What am I doing wrong?
> >>>> (later, I check the buffer size allocated via MMAP: 50688 => 176 x
> >>>> 144 x
> >>>> 2)
> >>>>
> >>>>
> >>>>
> >>>> Any ideas? Where could be the problem?
> >>>>
> >>>>
> >>>>
> >>>> Regards,
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> Cédric Lescop
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Wed, March 18, 2009 13:52, Laurent Pinchart wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Monday 16 March 2009 14:43:35 lesc...@esiee.fr wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Hello everyone,
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> I'm using this webcam to do some streaming and image analysis.
> >>>>>> When using Logitech's driver under MS Window, it works fine.
> >>>>>> I've
> >>>>>> access to all resolutions with the RGB24 format.
> >>>>>>
> >>>>>>
> >>>>> The camera doesn't support the RGB24 format natively. Transcoding
> >>>>> has to be done in software. libv4l2 can help you there.
> >>>>>
> >>>>>
> >>>>>
> >>>>>> The problem is when running under Linux. I'm using uvcvideo
> >>>>>> driver via V4L2 but I can't make it work properly. The resolution
> >>>>>> gets stuck to 176x144 and the format is YUYV.
> >>>>>>
> >>>>>> Normally, the webcam is supposed to support a 1600x1200
> >>>>>> resolution, how can I set it up correctly?
> >>>>>>
> >>>>>>
> >>>>> You should be able to use higher resolutions. Can you describe
> >>>>> your problem in details, including the steps performed and the
> >>>>> error messages being printed ?
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Thank you in advance,
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> xioctl (fd, VIDIOC_ENUM_FMT, &fdq)
> >>>>>>
> >>>>>> returns me 2 formats only: MJPEG and YUYV. YUYV is fine for me
> >>>>>> but I
> >>>>>> can't reach 1600x1200, or 800x600 or even not 320x240!!!!
> >>>>>>
> >>>>>>
> >>>>> Best regards,
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> Laurent Pinchart
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>> _______________________________________________
> >>>> Linux-uvc-devel mailing list
> >>>> Linux-uvc-devel@lists.berlios.de
> >>>> https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>> _______________________________________________
> >>> Linux-uvc-devel mailing list
> >>> Linux-uvc-devel@lists.berlios.de
> >>> https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >
> >
>
>
>
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