Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
On jeu, 2009-05-28 at 10:40 -0400, Hans-Christoph Steiner wrote: On May 28, 2009, at 10:08 AM, IOhannes m zmoelnig wrote: Hans-Christoph Steiner wrote: Is there something that can be done in Pd-extended to make this work? Should all of the build farm machines have libv4l-dev installed? yep. though i seem to remember that there were some problems with older versions of libv4l (no idea, which exact version though; might be very early versions, like 0.1). for the future, libv4l is definitely the way to go on linux. Ok I installed libv4l-dev(el) on Debian/testing, Ubuntu/Intrepid, Ubuntu/Jaunty, and Fedora 9. The other distros didn't have it. It was version 0.5.[789] Hello, I just managed to install v4l on Ubuntu Hardy I downloaded libv4l-0.5.98.tar.gz from this URL http://people.atrpms.net/~hdegoede/ tar xvzf libv4l-0.5.98.tar.gz make then I copied the libs to /usr/local/lib and redefined the variable export LD_PRELOAD=/usr/local/lib/libv4l.0.5.98/libv4l1/v4l1compat.so and for the next session echo export LD_PRELOAD=/usr/local/lib/libv4l1/v4l1compat.so ~/.bashrc Works fine with a Logitech Quickcam Communicate STX ++ OH Using ReBirth is like trying to play an 808 with a long stick.- David Zicarelli ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
abonnements-olivier wrote: and for the next session echo export LD_PRELOAD=/usr/local/lib/libv4l1/v4l1compat.so ~/.bashrc actually i would not recommend this. LD_PRELOAD seriously interferes with how application linking works (and is therefore usually discouraged); the sole purpose of it is to allow library calls be intercepted and provided by a different backend, something useful when doing debugging or swapping a backend for a single application (like chromium does with openGL apps; or libv4l-compat in our case). otoh, the only thing that libv4l compat can actually intercept is calls to ioctl(), which is deep on the kernel-side. overriding ioctl for each and every application is probably really not what you want. apart from slowing everything down (as it wraps a system call!), you might turn otu seeing your harddisk as a webcam. probably nice pictures, but bad data. (surely libv4l-devs are trying to do everything to not do any harm when wrapping system calls; but they will most likely have bugs in their code as everybody) thus the way to go, is to compile an application with native libv4l support. anyhow, i just wanted to point out, that people here are lately suggesting a log of brute force solutions, which might work fine but nevertheless i think it would be proper to warn anybody that they might just grill their cat. fgmasdr IOhannes ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
Fränk Zimmer wrote: Hi, I?m on Ubuntu Intrepid with Pd-extended 0.41.4-rc3 and I want to work with a Logitech webcam in Gem. Well in PDP erverything works fine withe the video4linux driver.- Trying i think you are mistaken here: your webcam works fine with [pdp_v4l2] which uses the video4linux2 drivers. to do the sam in Gem by choosing the correct device and the video4linus driver, I get a blank video try choosing V4L2 as the driver in Gem. fgmasdr IOhannes smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
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 ? vg,fr IOhannes m zmoelnig schrieb: Fränk Zimmer wrote: Hi, I?m on Ubuntu Intrepid with Pd-extended 0.41.4-rc3 and I want to work with a Logitech webcam in Gem. Well in PDP erverything works fine withe the video4linux driver.- Trying i think you are mistaken here: your webcam works fine with [pdp_v4l2] which uses the video4linux2 drivers. to do the sam in Gem by choosing the correct device and the video4linus driver, I get a blank video try choosing V4L2 as the driver in Gem. fgmasdr IOhannes -- Fränk Zimmer visit: http://fz.mur.at ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
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 smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
IOhannes m zmoelnig wrote: 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 and to answer your question more precisely: the number you see right after the video driver, is the number you should use in the [driver $1( message to activate the said backend. fgmasdr IOhannes smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
Is there something that can be done in Pd-extended to make this work? Should all of the build farm machines have libv4l-dev installed? .hc On May 28, 2009, at 6:09 AM, Fränk Zimmer wrote: 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 ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list All mankind is of one author, and is one volume; when one man dies, one chapter is not torn out of the book, but translated into a better language; and every chapter must be so translated -John Donne ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
Hans-Christoph Steiner wrote: Is there something that can be done in Pd-extended to make this work? Should all of the build farm machines have libv4l-dev installed? yep. though i seem to remember that there were some problems with older versions of libv4l (no idea, which exact version though; might be very early versions, like 0.1). for the future, libv4l is definitely the way to go on linux. fmgasdr IOhannes smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] webcam problem in Gem with Ubuntu Intrepid/Pd-extended 0.41.4-rc3
On May 28, 2009, at 10:08 AM, IOhannes m zmoelnig wrote: Hans-Christoph Steiner wrote: Is there something that can be done in Pd-extended to make this work? Should all of the build farm machines have libv4l-dev installed? yep. though i seem to remember that there were some problems with older versions of libv4l (no idea, which exact version though; might be very early versions, like 0.1). for the future, libv4l is definitely the way to go on linux. Ok I installed libv4l-dev(el) on Debian/testing, Ubuntu/Intrepid, Ubuntu/Jaunty, and Fedora 9. The other distros didn't have it. It was version 0.5.[789] .hc Using ReBirth is like trying to play an 808 with a long stick.- David Zicarelli ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
