From: <fun...@ya...> - 2007-10-24 10:46:54
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Hi all,=0A=0AI just signed up to this list and I hope, that somebody here c= an help me.=0A=0AI have a Logitech Quickcam Sphere MP and it works fine usi= ng the uvcvideo driver. =0AMy OS is openSUSE 10.3 (x86_64) with the 2.6.22.= 9 kernel (64 Bit).=0A=0AAnyway, I need to access the video stream with seve= ral applications simultaneously, =0Aso I tried the vloopback module.=0A=0AI= downloaded vloopback-1.1-rc1 from =0Ahttp://www.lavrsen.dk/twiki/bin/view/= Motion/VideoFourLinuxLoopbackDevice =0Aand it compiled fine on my system...= no errors, no warnings.=0A=0A# modprobe vloopback=0A# dmesg=0Avloopback-1.= 1-rc1/vloopback.c: Video4linux loopback driver v1.1-rc1=0Avloopback-1.1-rc1= /vloopback.c: Loopback 0 registered, input: video1,output: video2=0A=0ASo i= t seems like the loopback device is setup fine on my system.=0A=0ANow if I = try to feed the loopback device I get the following errors:=0A=0A# feed /de= v/video0 /dev/video1 320x240 yuv420p=0Ano mmap falling back on read=0Aioctl= (VIDIOCGCAP)=0AError[Invalid argument]=0AStarting video stream.=0AYou boug= ht vaporware!=0AError[No such device]=0A=0AAnd dmesg gives me:=0A# dmesg=0A= ioctl32(feed:21922): Unknown cmd fd(4) cmd(803c7601){t:'v';sz:60} arg(ffb56= 278) on /dev/video1=0A=0AUnfortunately, I have no idea what these errors me= an nor what's the reason.=0A=0ASo my questions are:=0A1.) Can vloopback act= ually be used on a x86_64 64 Bit system?=0A2.) Is vloopback-1.1-rc1 suppose= d to actually work on kernel 2.6.22 or would this require a patch?=0A3.) Th= e uvcvideo driver exports a V4L2 device/interface. Can vloopback handle V4L= 2 devices, too?=0A Or does vloopback only work with V4L devices?=0A=0A= =0AKind Regards,=0AJ=F6rg=0A =0A=0A=0A=0A Machen Sie Yahoo! zu Ihrer S= tartseite. Los geht's: =0Ahttp://de.yahoo.com/set |
From: Joerg W. <mo...@al...> - 2007-10-24 11:02:50
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Hi Joerg, I haven't checked if vloopback is compatible with the latest kernels. Mos= t probably there is an issue. But the answer to your problem is much more simple: v4l2 supports multipl= e simultaneous connections. Anyway there seems to be a restriction: you cannot connect to a device more than once using the same application. But you can for example run motion with a device and watch the same device with a TV application at the same time. Brgds Joerg. J=F6rg Hermsdorf wrote: > > So my questions are: > 1.) Can vloopback actually be used on a x86_64 64 Bit system? > 2.) Is vloopback-1.1-rc1 supposed to actually work on kernel 2.6.22 or > would this require a patch? 3.) The uvcvideo driver exports a V4L2 > device/interface. Can vloopback handle V4L2 devices, too? Or does > vloopback only work with V4L devices? > > > Kind Regards, > J=F6rg |