Re: Announcing libv4l 0.3.4

--- On Wed, 9/7/08, Chris Hammond <[email protected]> wrote:

> From: Chris Hammond <[email protected]>
> Subject: Re: [Spca50x-devs] Announcing libv4l 0.3.4
> To: "Hans de Goede" <[email protected]>
> Date: Wednesday, 9 July, 2008, 2:45 PM
> --- On Wed, 9/7/08, Hans de Goede
> <[email protected]> wrote:
> 
> > From: Hans de Goede <[email protected]>
> > Subject: Re: [Spca50x-devs] Announcing libv4l 0.3.4
> > To: [email protected], "SPCA50x Linux Device
> Driver Development"
> <[email protected]>
> > Date: Wednesday, 9 July, 2008, 11:56 AM
> > Chris Hammond wrote:
> > > --- On Mon, 7/7/08, Hans de Goede
> > <[email protected]> wrote:
> > > 
> > > <snip>
> > >> I'm afraid version 0.3.3 had a nasty bug,
> so
> > here is
> > >> 0.3.4:
> > >>
> > http://people.atrpms.net/~hdegoede/libv4l-0.3.4.tar.gz
> > >>
> > > <snip>
> > > 
> > > OK this is my first attempt to use gspcav2 and
> libv41
> > together - so I may have made a beginners mistake...
> > > 
> > > I installed gspca-9ff62c80bf4c.tar.gz from
> > http://linuxtv.org/hg/~jfrancois/gspca/
> > > 
> > > This appears to work as dmesg reports:
> > > 
> > > usb 2-2: new full speed USB device using uhci_hcd
> and
> > address 2
> > > usb 2-2: configuration #1 chosen from 1 choice
> > > gspca: main v2.1.6 registered
> > > gspca: probing 046d:0928
> > > gspca: probe ok
> > > usbcore: registered new interface driver spca561
> > > spca561: v2.1.5 registered
> > > 
> > > I can't get any useable picture - not
> surprising
> > as virtually nothing understands the default bayer
> format
> > from this camera, so I thought easy solution install
> > libv4l-0.3.4.tar.gz  - done in default location.
> > > 
> > > Unfortunately I get the following error:
> > > 
> > > 
> > > $export
> > LD_PRELOAD=/usr/local/lib/libv4l/v4l2convert.so
> > > $ mplayer tv:// -tv device=/dev/video0
> > > mplayer: error while loading shared libraries:
> > libv4l2.so.0: cannot open shared object file: No such
> file
> > or directory
> > > $    
> > > 
> > > 
> > 
> > I assume you did do a "make install",
> > /usr/local/lib is not a standard path 
> > where ld.so looks, so you need to run the
> > "ldconfig" command as root to tell 
> > ld.so where to find libv4l2.so.0, I guess this could
> be
> > considered a bug in the 
> > make install target.
> > 
> 
> Thank you - you guessed correctly. The error is removed
> after using ldconfig.
> 
> mplayer now needs outfmt specifying to work with the
> logitech webcam. i.e.
> 
> as root
> $ldconfig /usr/local/lib/
> 
> then as a user
> 
> $ export LD_PRELOAD=/usr/local/lib/libv4l/v4l2convert.so
> $ v4l-info | grep pixel
> ioctl VIDIOCGTUNER: Invalid argument
> ioctl VIDIOCGAUDIO: Invalid argument
> ioctl VIDIOCGFBUF: Invalid argument
>         pixelformat             : 0x31363553 [S561]
>         pixelformat             : 0x47524247 [GBRG]
>         pixelformat             : 0x33524742 [BGR3]
>         pixelformat             : 0x32315559 [YU12]
>         fmt.pix.pixelformat     : 0x31363553 [S561]
> 
> $ mplayer tv:// -tv device=/dev/video0:outfmt=0x33524742
> 
> Produces a good picture.  mplayer also works with
> outfmt=i420, bgr24 and 0x32315559.
> 
> gstreamer also works:
> $ gst-launch-0.10 v4l2src device=/dev/video0 !
> ffmpegcolorspace ! ximagesink
> 
> As does v4lctl to adjust brightness and contrast.
> $ v4lctl -c /dev/video0 contrast 200
> 
> I've not got skype working - but that is probably more
> to do with me using ssh and vncserver to access this PC
> (pulseaudio is refusing connections, etc).
> 
> Many thanks,
> 
> Chris
> 
> 
>      
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