Set Frequency Problem

Hello all,
it's first time I write to this mailing list, so I'm sorry if this 
problem has been already discussed.
I'm writing an application in java tha use v4l2 through JNI layer (but I 
have the same problem in a C test program)

When I call the VIDIOC_S_FREQUENCY the driver change the frequency, but 
the video signal is 0 (according to the VIDIOC_G_TUNER) and the image is 
black. I've to call some times the VIDIOC_S_FREQUENCY to get the signal on

The driver I'm using is the SAA7130.

Any ideas?

Just another question: at this time I'm working with userpointer and 
read method to grab the images, but probably I will must use the video 
overlay. I've tried to start the overlay following the v4l 
documentation, but it doesn't work. I suspect that I must use the Xorg 
library to get some information (such as the frame buffer address). 
Could someone show me the way?

Thanks in advance

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Pillar Engineering
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Cell. +39 333.14.27.805
E-Mail [email protected]
Sito: www.pillar.it  

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