Re: Skype and libv4l

[Lamarque Vieira Souza <lamarque@gmail.com>]

Em Tuesday 24 March 2009, Theodoros V. Kalamatianos escreveu:
> On Tue, 24 Mar 2009, Lamarque Vieira Souza wrote:
> >>> LD_PRELOAD=/usr/lib32/libv4l2.so /opt/skype/skype
> >>>
> >>>        /opt/skype/skype is the binary executable. There is not error
> >>> message about LD_PRELOAD or libv4l. Skype returns:
> >>>
> >>> Skype V4L2: Could not find a suitable capture format
> >>> Skype V4L2: Could not find a suitable capture format
> >>> Starting the process...
> >>> Skype Xv: Xv ports available: 4
> >>> Skype XShm: XShm support enabled
> >>> Skype Xv: Using Xv port 131
> >>> Skype Xv: No suitable overlay format found
>
> Keep in mind that LD_PRELOAD will be silently ignored for static binaries
> and it will simply NOT WORK. Are you certain that you are not using the
> static version of Skype?

	I am using the static version of Skype, but Skype is statically linked 
against Qt4 only, it is dynamically linked against all other libraries. Now I 
can get log using LIBV4L2_LOG_FILENAME if I preload this way:

LD_PRELOAD=/usr/lib32/libv4l/v4l2convert.so /opt/skype/skype

	I have found the problem. The vidioc_try_fmt_vid_cap function in the driver 
return -EINVAL if the fmt.pix.field is different from V4L2_FIELD_ANY or 
V4L2_FIELD_NONE. Skype seems to set this field as V4L2_FIELD_INTERLACED. 
Because of that libv4l assumes that all destination formats (YUV420 included) 
are invalid. Commenting this part of the driver makes Skype work and it is 
showing pictures. YES!!! :-)

-- 
Lamarque V. Souza
http://www.geographicguide.com/brazil.htm
Linux User #57137 - http://counter.li.org/

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