Hello there,
 
I have P4 (800 MHz FSB, 1MB L2), 512MB Dual Channel DDR and QDI P4I865PENovo Motherboard with Onboard ALC655 6 Channel CODEC (20-bit Stereo Codec, S/PDIF header onboard, Support Dolby Digital AC-3 audio).
I am runnind Windows XP SP2, I have installed FFDSHOW and AC3 Filter.
 
So I hooked up my SPDIF output to my Yamaha reciever via Coaxial cable.
Then I set in my AC97 Audio Configuration SPIF output to "Digital Only".
Now I can hear music playing, Yamaha says that the music is comming from digital coaxial input and everything is fine to this point.
But the music playback is interrupted (silenced) for a secong or maybe two every three to ten seconds.
It looks something like this if I try to draw it - 1 is normal music playback for one second and 0 is one second silence:
 
11101111011111001101100111101111100111100011
 
 
Does anybody know why am I experiencing this?
 
I have tried everything to fix this:
- Reinstalled WindowsXP,
- Changed audio drivers from first to last version,
- Changed Motherboard through warrianty support so I get the same vendor and same sound chip...
- I have also disabled sound hardware and tried with Creative SB Value and I get the same results...
- I shortened Coax cable to 2 meters...
... and nothing helped.
 
I am running out of ideas and my nerves so please, can somebody help me?
 
Thanks,
-Andrej