David, Well first of all you should not actually need to do a mknod since devfs automatically creates and removes device nodes as needed. The problem that i see is that it does not appear from hat you typed that you are using libv4l libraries. These are needed as many applications including mplayer do not natively support the image output format used by the sn9c20x driver.
After installing libv4l you can use it with mplayer via the following command line $ LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so mplayer tv:// -tv driver=v4l2:width=640:height=480:outfmt=i420:fps=30 I should also point out that this driver is actually deprecated in favor of the a newer gspca based driver that can be obtained from the v4l-dvb tree at linuxtv.org. That tree also contains the latest version of libv4l as well. Brian Johnson On Thu, Feb 4, 2010 at 7:28 PM, David Mebane <[email protected]> wrote: > Hi folks, > > I know I am a little behind, but i just upgraded my kernel to 2.6.27-16, and > so I had to recompile the webcam drivers. And now it's not working. > > Here's what I do: > > $ sudo mknod /dev/video0 c 81 0 > $ sudo modprobe videodev > $ sudo modprobe -v compat_ioctl32 > $ sudo insmod sn9c20x.ko > > When I run > > $ mplayer tv:// -tv driver=v4l2:width=640:height=480:outfmt=i420:fps=30 > > I get > > MPlayer 1.0rc2-4.3.2 (C) 2000-2007 MPlayer Team > CPU: Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz (Family: 6, Model: 15, > Stepping: 6) > CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 > Compiled with runtime CPU detection. > mplayer: could not connect to socket > mplayer: No such file or directory > Failed to open LIRC support. You will not be able to use your remote > control. > > Playing tv://. > TV file format detected. > Selected driver: v4l2 > name: Video 4 Linux 2 input > author: Martin Olschewski <[email protected]> > comment: first try, more to come ;-) > Selected device: SN9C20x USB 2.0 Webcam Driver > Capabilites: video capture read/write streaming > supported norms: > inputs: 0 = Webcam;v4l2: ioctl get input failed: Invalid argument > > Current input: 1 > Current format: unknown (0x30323953) > v4l2: ioctl set format failed: Invalid argument > tv.c: norm_from_string(pal): Bogus norm parameter, setting default. > v4l2: ioctl enum norm failed: Invalid argument > Error: Cannot set norm! > Selected input hasn't got a tuner! > v4l2: ioctl set mute failed: Invalid argument > xscreensaver_disable: Could not find XScreenSaver window. > GNOME screensaver disabled > ========================================================================== > Cannot find codec matching selected -vo and video format 0x30323953. > Read DOCS/HTML/en/codecs.html! > ========================================================================== > > v4l2: ioctl set mute failed: Invalid argument > v4l2: 0 frames successfully processed, 0 frames dropped. > > Exiting... (End of file) > > > The relevant-looking part of dmesg is > > > [18716.235952] Linux video capture interface: v2.00 > [18829.774461] sn9c20x: SN9C20X USB 2.0 Webcam - 0C45:624F plugged-in. > [18829.885532] sn9c20x: Detected OV9650 Sensor. > [18829.885706] sn9c20x: Webcam device 0C45:624F is now controlling video > device /dev/video0 > [18829.885867] input: SN9C20X Webcam as > /devices/pci0000:00/0000:00:1d.7/usb5/5-4/input/input8 > [18829.927397] sn9c20x: No ack from I2C slave 0x30 for write to address 0x17 > [18829.931496] sn9c20x: Using yuv420 output format > [18829.931563] usbcore: registered new interface driver sn9c20x > [18829.931569] sn9c20x: SN9C20x USB 2.0 Webcam Driver v2009.04 loaded > [18976.539926] sn9c20x: Using yuv420 output format > [18976.546680] sn9c20x: Using yuv420 output format > [18976.553554] sn9c20x: Using yuv420 output format > [19117.586283] sn9c20x: Using yuv420 output format > [19358.558051] process `skype' is using obsolete setsockopt SO_BSDCOMPAT > [19975.081756] sn9c20x: Using yuv420 output format > [19975.101228] sn9c20x: Using yuv420 output format > [19975.106011] sn9c20x: Using yuv420 output format > [20209.535218] sn9c20x: Using yuv420 output format > [20209.542318] sn9c20x: Using yuv420 output format > [20209.547693] sn9c20x: Using yuv420 output format > [20250.027806] sn9c20x: Using yuv420 output format > [20250.034302] sn9c20x: Using yuv420 output format > [20250.039677] sn9c20x: Using yuv420 output format > > > Any help is much appreciated. > > > -David > > -- > Lets make microdia webcams plug'n play, (currently plug'n pray) > To post to this group, send email to [email protected] > Visit us online https://groups.google.com/group/microdia -- Lets make microdia webcams plug'n play, (currently plug'n pray) To post to this group, send email to [email protected] Visit us online https://groups.google.com/group/microdia
