Re: [GnomeMeeting-list] Scaling video from 640x480 with the ov511 driver

[Damien Sandras <damien sandras it-optics com>]

Hello James,

thanks for the tip, I think it will be useful for many people!


Le ven 06/02/2004 à 23:37, James Bunton a écrit :
> > I also have OV511 and here it does scale fine.. Maybe this is my camera
> > or your driver is too old..
> Nah, I'm using the latest 2.x driver (2.27 I think).
> Maybe your camera only goes up to 352x288?
> 
> 
> > try with the loopback v4l driver and effectv.. maybe you're lucky and
> > can resize in the loopback.. that way you don't need to hack any code..
> > (but if you do, please send in the patches to us instead of making them
> > laying around the net and become forgotten about)
> 
> Thanks for the suggestion of vloopback!
> 
> I got it working fine, if a little bit of a hack. So I'll just post how I did 
> it here for anybody to see later. (not sure if this is applicable to go in 
> the GnomeMeeting docs?)
> 
> You need to download the vloopback module from here
> http://motion.technolust.cx/vloopback/
> 
> Untar it to some place, and change to that directory
> Check the Makefile to ensure that the INCLUDEDIR points to your kernel headers 
> (usually /usr/src/linux)
> Compile the module and insert it into the kernel. I had to provide the module 
> options dev_offset=2 (I have two video4linux devices and it crashed when it 
> didn't detect that). So..
> 
> make
> insmod vloopback.o dev_offset=2
> 
> Then change to the examples directory
> Edit resize.c to change wherever it says RGB24 to YUV420P (there should be 
> two)
> Run make again to compile the files in that directory.
> 
> Now run resize.
> 
> ./resize /dev/video1 /dev/video2 640x480 352x288
> 
> The option is your camera's device (my tv card is video0), the second is the 
> input stream that vloopback creates (it will be different if you didn't use 
> dev_offset=2), the third is the max resolution of your camera, and the last 
> is the highest resolution that GnomeMeeting will accept.
> 
> 
> Hope that helps somebody later on..
> 
> 
> ---
> 
> James
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-- 
 _      Damien Sandras
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