[PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3

[Fränk Zimmer]

The Gem version in the recent pd-ectended does not suppoert video4linux2.
I tried your workaround.-

1) installed the libv4l-dev with synaptics

2)
% export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so
% pd -lib Gem

It works. So I`ll  have to start pd-ext everytime with this 2 lines.
BUT the image quality is quiete bad. Is this because of the new driver ?
Can I get a better quality? (the same as in winXP or in PDP on Ubuntu)

thanks .-

fraenk


IOhannes m zmoelnig schrieb:
> Fränk Zimmer wrote:
>> Hm. Taking the pix_video-help patch:  I can switch from driver 0 to 
>> driver 1 by sending a message to pix_video.
>> How do I switch to the V4L2 driver ?
>
> when instantiating the first [pix_video] object, you should see (on 
> the pd-console) a list of available drivers.
> e.g. here i see:
> video driver 0: video4linux2
> video driver 1: video4linux
> video driver 2: ieee1394 for linux
>
> if you don't have a line with "video4linux2", then you don't have v4l2 
> support compiled into your version of Gem.
>
>
> in this case you have to possibilities, both of them include using 
> libv4l (apt-get install libv4l-dev)
>
> - compile yourself a recent verson of Gem (after installing libv4l); 
> it should autodetect everything for you
>
> - libv4l also supports a wrapper (read the README of libv4l) to bring 
> it's functionality to applications compiled without it. just do
> % export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so
> % pd -lib Gem
>
> in the latter case, Gemwill still use v4l1 ("video4linux"), but the 
> wrapper should transparently translate this to v4l2
>
>
> tell us whether this works.
>
> mfgasdr
> IOhannes
>


-- 

Fränk Zimmer

visit: http://fz.mur.at