The right command is in the following form:
luvcview -f yuv -s 640x480
Change 640 (WIDTH) and 480 (HEIGHT) with all the resolutions supported by
your webcam.
If you have some doubt, just have a look to the man:
man luvcview
Regards,
Marco Argiolas
2008/7/7 erwin <[EMAIL PROTECTED]>:
> Ok Marco this is what i got: i really don't know what to do.
> [EMAIL PROTECTED]:~$ 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 = 'YUYV', description = 'YUV 4:2:2 (YUYV)' }
> { discrete: width = 640, height = 480 }
> Time interval between frame: 1/20,
> { discrete: width = 160, height = 120 }
> Time interval between frame: 1/24,
> { discrete: width = 176, height = 144 }
> Time interval between frame: 1/24,
> { discrete: width = 320, height = 240 }
> Time interval between frame: 1/24,
> { discrete: width = 352, height = 288 }
> Time interval between frame: 1/24,
> { discrete: width = 800, height = 600 }
> Time interval between frame: 1/7,
> { discrete: width = 1024, height = 768 }
> Time interval between frame: 1/7,
> { discrete: width = 1280, height = 800 }
> Time interval between frame: 1/7,
> { discrete: width = 1280, height = 960 }
> Time interval between frame: 1/7,
> { discrete: width = 1280, height = 1024 }
> Time interval between frame: 1/7,
> [EMAIL PROTECTED]:~$
>
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 640, height = 480
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 160, height = 120
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 176, height = 144
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 320, height = 240
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 352, height = 288
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 800, height = 600
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 1024, height = 768
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 1280, height = 800
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s
> luvcview version 0.2.1
> No parameter specified with -s, aborting.
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 1280, height = 960
> luvcview version 0.2.1
> Error in size use -s widthxheight
> [EMAIL PROTECTED]:~$ luvcview -f yuv -s width = 1280, height = 1024
> luvcview version 0.2.1
> Error in size use -s widthxheight
>
>
>
>
> On Mon, 2008-07-07 at 20:03 +0200, Marco Argiolas wrote:
> > Ok, I was wrong:
> >
> > 2008/7/7 Marco Argiolas <[EMAIL PROTECTED]>:
> > Well I really don't know,
> > I think only Laurent (and those who know what "format 5" is)
> > could help you.
> >
> > The program was unable to set format V4L2_BUF_TYPE_VIDEO_CAPTURE, the
> > number 5 was the error stored in "errno"! errno=5 corrisponds to EIO
> > that is an error in I/O..and I think it is not a good news!! :(
> >
> > However this is the code where the error should happen:
> >
> > /* set format in */
> > memset(&vd->fmt, 0, sizeof(struct v4l2_format));
> > vd->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> > vd->fmt.fmt.pix.width = vd->width;
> > vd->fmt.fmt.pix.height = vd->height;
> > vd->fmt.fmt.pix.pixelformat = vd->formatIn;
> > vd->fmt.fmt.pix.field = V4L2_FIELD_ANY;
> > ret = ioctl(vd->fd, VIDIOC_S_FMT, &vd->fmt);
> > if (ret < 0) {
> > printf("Unable to set format: %d.\n", errno);
> > goto fatal;
> > }
> >
> > At this point the only suggestion I can give you is to try the
> > following command with all the resolutions supported with your webcam
> > (you can get a list with "luvcview -L"):
> > luvcview -f yuv -s WIDTHxHEIGHT
> >
> > Your webcam should support the followings:
> > width = 640, height = 480
> > width = 160, height = 120
> > width = 176, height = 144
> > width = 320, height = 240
> > width = 352, height = 288
> > width = 800, height = 600
> > width = 1024, height = 768
> > width = 1280, height = 800
> > width = 1280, height = 960
> > width = 1280, height = 1024
> >
> > Good luck!!!
> >
> > Marco Argiolas
> >
> >
> >
> > You should download the sources of luvcview and try to
> > understand what happens.
> > Unluckly now I have no time for this.
> >
> > ps.
> > please pay attenction in sending email also to UVC mailing
> > list ;)
> >
> > 2008/7/7 erwin <[EMAIL PROTECTED]>:
> >
> > Ok i tried the command luvcview -f yuv and finally i
> > had an image but
> >
> >
> > only a snapshot not a streaming and after 3 times a
> > tried it happened
> > this:
> > [EMAIL PROTECTED]:~$ luvcview -f yuv
> > luvcview version 0.2.1
> > Video driver: x11
> > A window manager is available
> > video /dev/video0
> >
> > Unable to set format: 5.
> > Init v4L2 failed !! exit fatal
> >
> > what do you think about?
> >
> > On Mon, 2008-07-07 at 08:20 +0200, Marco Argiolas
> > wrote:
> > > luvcview -f yuv
>
>
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