$ sudo cheese
** Message: pygobject_register_sinkfunc is deprecated (GstObject)
ERROR: Could not load classifier cascade /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml
ERROR: Could not load classifier cascade /usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml
libv4l2: error dequeuing buf: Error de entrada/salida

lsmod|grep ov51

$ lsmod|grep ov51
gspca_ov519            40053  0
gspca_main             27688  1 gspca_ov519

mplayer tv:// -tv driver=v4l2:width=320:height=200:fps=24:device=/dev/video0 -nosound

$ mplayer tv:// -tv driver=v4l2:width=320:height=200:fps=24:device=/dev/video0 -nosound
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
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 <olschewski@zpr.uni-koeln.de>
comment: first try, more to come ;-)
Selected device: BT878 video (Pinnacle PCTV Stud
Tuner cap:
Tuner rxs: MONO
Capabilites:  video capture  video overlay  VBI capture device  tuner  read/write  streaming
supported norms: 0 = NTSC; 1 = NTSC-M; 2 = NTSC-M-JP; 3 = NTSC-M-KR; 4 = PAL; 5 = PAL-BG; 6 = PAL-H; 7 = PAL-I; 8 = PAL-DK; 9 = PAL-M; 10 = PAL-N; 11 = PAL-Nc; 12 = PAL-60; 13 = SECAM; 14 = SECAM-B; 15 = SECAM-G; 16 = SECAM-H; 17 = SECAM-DK; 18 = SECAM-L; 19 = SECAM-Lc;
inputs: 0 = Television; 1 = Composite1; 2 = S-Video;
Current input: 0
Current format: BGR24
v4l2: current audio mode is : MONO
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
[VO_TDFXFB] Can't open /dev/fb0: No such file or directory.
[VO_3DFX] Unable to open /dev/3dfx.
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
Movie-Aspect is undefined - no prescaling applied.
VO: [vdpau] 320x200 => 320x200 Planar YV12
Selected video codec: [rawyv12] vfm: raw (RAW YV12)
==========================================================================
Audio: no sound
Starting playback...
v4l2: 648 frames successfully processed, 439 frames dropped.

Selected device: BT878 video (Pinnacle PCTV Stud

v4l2-ctl --list-devices

~$ v4l2-ctl --list-devices
BT878 video (Pinnacle PCTV Stud (PCI:0000:06:01.0):
   /dev/video0
   /dev/vbi0

USB Camera (usb-0000:00:1d.2-1):
   /dev/video1

$ mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video1
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
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 <olschewski@zpr.uni-koeln.de>
comment: first try, more to come ;-)
v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead.
Selected device: USB Camera
Capabilites:  video capture  read/write  streaming
supported norms:
inputs: 0 = ov519;
Current input: 0
Current format: unknown (0x3831354f)
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: Cannot get fps
v4l2: ioctl set mute failed: Invalid argument
v4l2: ioctl query control failed: Invalid argument
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
open: No such file or directory
[MGA] Couldn't open: /dev/mga_vid
[VO_TDFXFB] Can't open /dev/fb0: No such file or directory.
[VO_3DFX] Unable to open /dev/3dfx.
==========================================================================
Cannot find codec matching selected -vo and video format 0x3831354F.
==========================================================================

v4l2: select timeout
v4l2: ioctl set mute failed: Invalid argument
v4l2: 1 frames successfully processed, 0 frames dropped.

Exiting... (End of file)