mplayer -tv  device=/dev/video0:fps=29.97 tv://

##</code><code>##

mencoder \                                                                                                                             
    tv:// \                                                                                                                            
    -tv driver=v4l2:device=/dev/video0:fps=30:width=640:height=480:forceaudio:alsa:adevice=hw.0,0 \                                    
    -ovc lavc \                                                                                                                        
    -oac lavc \                                                                                                                        
    -ffourcc divx \                                                                                                                    
    -noskip  -mc 0 -ofps 30 \                                                                                                          
    -o record-compressed-good-sync.avi