[mythtv-users] # cat /dev/video0 > /tmp/test_capture.mpg can't get live TV window

[HHH]

when I used:
"# cat /dev/video0 > /tmp/test_capture.mpg" I can't get live TV window, but the test_capture.mpg was saved and I could use
" # mplayer -vo xv /tmp/test_capture.mpg" to watch the captured&saved tv program.
What's wrong, how can I get live tv program when using the first command.
 
 





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