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RealProducer and v4lctl setchannel (on the fly)

Hi,

  i've got saa7134 based tv card (avermedia go 007) and stream tv signal using realproducer basic. 
  
  is it possible to change (tune) tv channel when realproducer is streaming? 
  simple sequence:
  producer <..params.. > &
  v4lctl -c /dev/video0 setchannel nn
 doesn't work because producer losts signal (after channel changing producer streams black picture and noise instead of sound). what is interesting is that when I call v4lctl command like setchannel or list or capture on/off (and producer is still 'grabbing' /dev/video0) producer for a moment (half second or less) gets the right channel. but after while its getting back to stream noise....

  any ideas?
  thanks for help,
  andrzeJ

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