[mythtv-users] Simple video tests are failing -- what other tests are helpful?

[Justin Gombos]

The following attempts at a simple device dump fail:

  sh-3.00$ cat /dev/video0 > simpleTest   
  cat: /dev/video0: Invalid argument

  sh-3.00$ dd if=/dev/video0 of=simpleTest
  dd: reading `/dev/video0': Invalid argument
  0+0 records in
  0+0 records out
  0 bytes transferred in 0.002232 seconds (0 bytes/sec)

The mplayer test I've seen folks use to test also fails:

  root at mythtv:/home/mythtv# mplayer /dev/video0
  MPlayer 1.0pre5-3.3.4 (C) 2000-2004 MPlayer Team
  
  CPU: Intel Celeron Covington/Pentium II Deschutes,Tonga/Pentium II Xeon 398.7 MHz (Family: 6, Stepping: 1)
  Detected cache-line size is 32 bytes
  CPUflags:  MMX: 1 MMX2: 0 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0
  Compiled with runtime CPU detection - WARNING - this is not optimal!
  To get best performance, recompile MPlayer with --disable-runtime-cpudetection.
  Reading config file /usr/local/etc/mplayer/mplayer.conf: No such file or directory
  Creating config file: /root/.mplayer/config
  Reading config file /root/.mplayer/config
  Reading /root/.mplayer/codecs.conf: Can't open '/root/.mplayer/codecs.conf': No such file or directory
  Reading /usr/local/etc/mplayer/codecs.conf: Can't open '/usr/local/etc/mplayer/codecs.conf': No such file or directory
  Using built-in default codecs.conf.
  font: can't open file: /root/.mplayer/font/font.desc
  font: can't open file: /usr/local/share/mplayer/font/font.desc
  Using Linux hardware RTC timing (1024Hz).
  Can't open input config file /root/.mplayer/input.conf: No such file or directory
  Can't open input config file /usr/local/etc/mplayer/input.conf: No such file or directory
  Falling back on default (hardcoded) input config
  Setting up LIRC support...
  mplayer: could not connect to socket
  mplayer: Connection refused
  Failed to open LIRC support.
  You will not be able to use your remote control.
  
  Playing /dev/video0.
  Segmentation fault

I'm sure the correct driver is loaded, but I'm not sure that it's
mapped to /dev/video0.  How do I verify this?