Re: [GnomeMeeting-list] Re: [V4L] Gnomemeeting and videum cards,

[Damien Sandras <sandras student info ucl ac be>]

On Sat, 10 Aug 2002, Auzie Morgan wrote:

[...]

Hi,

GnomeMeeting is able to support all colour formats thanks to the use of
PWLib and is able to do the conversion itself.

However, not all video4linux drivers have the same behavior when doing
the ioctls.

If you edit pwlib/src/ptlib/unix/video4linux.cxx, and add some comments
here and there, you will see where it fails to set the video palette.
You can also print the videodriver name (should be ibmcam).

At the beginning of the file, there is a list of "hints". Hints are
there to specify for some drivers that it is preferable to use one
or another palette, one or another video size. Once you identified
your driver name, and once you know for sure what sizes and video palettes
are supported, you can add a HINT for your camera and recompile pwlib.
That way, you are sure pwlib and GM will always use the right settings.

Bad behaviors happen with driver somewhat broken, that do not report
the right capabilities during the init.

Good luck.

(I thought there already was a hint for the ibmcam in pwlib, but I might
be wrong)

Damien

PS: I don't have such a card or webcam, so it is impossible for me to
"fix" that, but believe me, it is pretty easy once you understood how
it works.


> Dmitri wrote:
> 
> >Quoting Auzie Morgan <auzie auzievision com>:
> >
> >  
> >
> >>Ok Xawtv, Avicap (avifile nice easy build divx encoder / player and 
> >>more) No problem,,
> >>Gomemeeting and my IBMCAM driver,, no go..
> >>
> >>Gnome meeting cant seem to translate the device pallet?
> >>Your driver doesn't support the rgb15l format.
> >>    
> >>
> >
> >It does not, indeed. It had been decided that a v4l driver should only 
> >produce the stream in one format, preferrably closest to the native device 
> >format (palette). A driver must not convert palettes - this is difficult 
> >to do in kernel space, awkward to do without FPU, makes the driver much 
> >more complicated and crash-prone, and pollutes the kernel space with 
> >similar-but-different pieces of conversion code (in each driver).
> >
> >The ibmcam driver produces BGR24 - this is almost the native format in 
> >many IBM/Xirlink cameras.
> >
> >It is gnomemeeting's responsibility to take one of standard formats and 
> >make use of it. xawtv, for example, does exactly that.
> >
> >  
> >
> >>Please check your kernel driver documentation in order to determine 
> >>which Palette is supported. Set it as GnomeMeeting default with:
> >>gconftool --set "/apps/gnomemeeting/devices/color_format" YOURPALETTE 
> >>--type string
> >>    
> >>
> >
> >If gnomemeeting can be configured for BGR24, then it should work. Couple
> >of years ago I wrote a patch for voxilla (openH.323 client) to accept
> >BGR24, and the patch is still somewhere on http://www.linux-usb.org.
> >
> >  
> >
> >>I also have an ibmcam but it doesnt like the videodevX setup.. :(
> >>    
> >>
> >
> >I don't understand that, sorry. You'd better be more specific :-)
> >
> >Dmitri
> >
> >  
> >
> 
>