On Fri, Aug 07, 2009 at 02:57:56PM +0200, Arnold Krille wrote:
That makes sense to me. The question I have now is: who or what is doing the resampling? Is it the card, internally? Or ALSA? If it's ALSA doing the resampling, then the problem is likely the driver for the card.
Wherever it is, either ALSA driver or the card's firmware or hardware, it may be a 32-bit or 16-bit overflow. When audio cards are running in normal mode, they just sit there most of the time unless you give them audio. But with JACK running, the card is constantly being fed something (zeroes? I haven't looked to find out what exactly) all the time. You'll notice your interrupt counter going up and up when JACK is running, even if no sound is coming out, for instance.
So my guess is that, every 14 minutes, enough frames are pumped to the card for that int/long/whatever to overflow. The strange sounds might be as it gets close to that overflow point.
Total wild guess here, but that's where I'd think of looking.
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