Hmm. Well, again, there is nothing special about track transitions as
far as the s/pdif is concerned. No information about a track change is
transmitted, nor is there any interruption of the signal or change in
the out-of-band data. (I am only speaking of SB3/TP here - a CD player
will at least change the Q-subcode data)

The only "special" thing that might be more likely to happen during a
track transition than elsewhere is that the signal could be composed of
digital silence (all zeroes), depending on the CD. This causes the
s/pdif signal to have the fewest possible number of transitions in each
frame, as opposed to any other audio signal which will have a random and
roughly equal distribution. A buggy s/pdif receiver may have trouble
locking on to the signal, but even if that were the case, I wouldn't
expect it to cause crackling. Rather, it would cause significant
dropouts which might sound like the beginning of the next track being
cut off. I have never actually heard of that happening, but it's
plausible.

The other thing that can happen in the presence of digital silence is
that a DAC could conceivably trigger a hardware muting circuit. Some
DAC chips even have dedicated output pins to signal all zeroes, for
this purpose. However IMHO that would be a rather stupid thing to do
for a valid, all zeroes signal. You would only want to do that if the
signal were no carrier at all.

So really I don't know what's going on in your system. If you get it
into a state again where you can reproduce the problem, you might try
concatenating two tracks together into a single file and playing that.
If you still get the crackling between the tracks then it could be a
data sensitive issue.


-- 
seanadams
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