No video with Scan&Tioune only

Hello all,
I'm experiencing a strange probem on my pc. Using Scan&Tioune the video windows remains gray and no video is decoded even if the reception is good, see the attachment.
Using same pc and exactly the same hardware with Minitioune it works perfectly. My guess is something with codecs, but cannot understand where the problem is. I've also tried different configurations os LAV filters, with no luck.
Thanks for your help! Mauro IW3ROW
I'm experiencing a strange probem on my pc. Using Scan&Tioune the video windows remains gray and no video is decoded even if the reception is good, see the attachment.
Using same pc and exactly the same hardware with Minitioune it works perfectly. My guess is something with codecs, but cannot understand where the problem is. I've also tried different configurations os LAV filters, with no luck.
Thanks for your help! Mauro IW3ROW